Linux 内核崩溃分析报告 - AI

AI智能摘要

作者展示了一份由 AI 生成的内核崩溃分析报告，并借此示范如何系统排查数组越界问题。案例中，qteeconnector@1 进程在 smcinvoke_dlkm 模块的 prepare_send_scm_msg() 内触发数据中止异常，原因是结构体中的边界字段被破坏：本应是一个很小的回调计数，却变成了 0x80010001 这种高得离谱的值，导致循环迭代数百万次，最终访问到未映射地址 0xffffff8005700000，引发崩溃。报告详细记录了从初始 bt、查看内核日志、确认模块基址，到对故障函数反汇编、检查结构体内存布局、用地址和寄存器值反证越界过程的完整推理链

此摘要由AI分析文章内容生成，仅供参考。

最近一直在研究利用AI主动式分析内核问题，都没时间写文章了，就贴一份AI分析一份数组越界访问的报告把，我全程没有干预分析。可以从它分析的流程里我们也能够学到一些东西。

PS : 希望对大家有用，别认为我是在糊弄你们，哈哈~~~

执行摘要

崩溃类型：数据中止异常（DABT）- 第 3 级转换故障

故障进程： qteeconnector@1（PID 932）- TrustZone 连接器守护进程

故障模块： smcinvoke_dlkm（SMC Invoke 驱动程序）

根本原因：数组越界访问，位于 prepare_send_scm_msg() 函数，原因是结构体字段损坏，包含无效的边界值（0x80010001 而非正常的小数值如 4-8）。

崩溃发生在迭代回调请求对象数组时。循环边界字段 [structure+8] 包含 0x80010001（2,147,549,185），导致循环运行数百万次，最终访问了 0xffffff8005700000 处的未映射内存。

分析对象

  ┌──────────────┬───────────────────────────────────────────────────────────────────────────┐
  │     对象     │                                    值                                     │
  ├──────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ 转储模式     │ 分离式 ramdump（2 个段）                                                  │
  ├──────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ dump_spec    │ DDRCS0_0.BIN@0x0, DDRCS0_1.BIN@0xC0000000                                 │
  ├──────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ vmlinux_path │ guitar_pre_global-symbols-vmlinux-p85-test-key-0226-userroot-13.0/vmlinux │
  ├──────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ crash_args   │ --kaslr=0x133fa00000 -m vabits_actual=39                                  │
  ├──────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ 模块符号     │ 位于 out/target/product/guitar/                                           │
  ├──────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ 会话 ID      │ 7f844117-0b6c-4c08-9a87-b891569bbc1b                                      │
  ├──────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ drgn 可用    │ 否（仅使用 crash 内置命令）                                               │
  └──────────────┴───────────────────────────────────────────────────────────────────────────┘

会话模式与约束

分离式 ramdump 需要使用 dump_spec 参数而非 vmcore_path
KASLR 偏移 0x133fa00000 已应用于符号解析
VABITS=39 表示 39 位虚拟地址空间（512GB VA）
drgn 不可用 - 仅使用 crash 内置命令进行调查
模块符号从 KALLSYMS 加载（smcinvoke_dlkm 基址：0xffffffd34bc5c000）

调查过程与命令级推理

步骤 1：初始回溯

可用证据：会话刚打开，无先前信息

假设：需要识别崩溃位置和调用栈

选择的命令： bt

原因：标准第一步，识别崩溃函数和调用栈

结果：

PID: 932 TASK: ffffff8036a0b600 CPU: 5 COMMAND: "qteeconnector@1"

分析： bt 命令仅返回任务头信息，没有完整的堆栈跟踪，表明需要从内核日志获取崩溃上下文。

步骤 2：内核日志检查

可用证据：单行 bt 输出，需要更多崩溃上下文

假设：内核日志应包含完整的 oops 消息和寄存器状态

选择的命令： log | tail -n 300

原因：日志缓冲区包含完整的崩溃转储，包括寄存器状态、调用跟踪和任何先前的错误消息

结果：获得丰富的证据：

完整的 oops 消息及寄存器转储
通过 smcinvoke_dlkm 的调用跟踪
崩溃前的重复错误消息
内核 panic 和 CPU 停止跟踪

假设如何改变：日志揭示这是 0xffffff8005700000 处的页面故障，位于 prepare_send_scm_msg+0x400，崩溃前有"Request object is not a callback object"和"server is invalid, res: -90"错误。

步骤 3：模块识别

可用证据： smcinvoke_dlkm 中崩溃，需要模块基址和符号

假设： smcinvoke_dlkm 是内核模块，需要确认已加载

选择的命令： mod smcinvoke_dlkm

原因：验证模块加载状态并获取基地址以进行符号解析

结果：

ffffffd34bc74d80 smcinvoke_dlkm ffffffd34bc5c000 204800

分析：模块确认加载于 0xffffffd34bc5c000，大小 200KB。

步骤 4：故障函数反汇编

可用证据：崩溃于 prepare_send_scm_msg+0x400，需要理解代码

假设：故障指令应揭示哪个内存访问失败

选择的命令： dis prepare_send_scm_msg

原因：识别偏移 0x400 处的确切指令并理解数据流

结果：识别关键代码路径：

  0xffffffd34bc67b44 <+1016>: mov     w22, wzr              // w22 = 0（初始化计数器）
  0xffffffd34bc67b48 <+1020>: add     x26, x19, #0xc        // x26 = 数组基址
  0xffffffd34bc67b4c <+1024>: ldr     w9, [x26, w22, sxtw #2]  // w9 = array[w22] <-- 崩溃
  0xffffffd34bc67b54 <+1032>: ldr     w8, [x19, #4]
  ...
  0xffffffd34bc67b68 <+1052>: bl      process_tzcb_req
  0xffffffd34bc67b6c <+1056>: ldr     w8, [x19, #8]         // w8 = 边界
  0xffffffd34bc67b70 <+1060>: add     w22, w22, #1          // w22++
  0xffffffd34bc67b74 <+1064>: cmp     w22, w8
  0xffffffd34bc67b78 <+1068>: b.cc    <+1024>               // 当 w22 < w8 时循环

假设如何改变：崩溃发生在循环中，该循环：

初始化 w22 = 0
设置 x26 = x19 + 12 为数组基址
每次迭代加载 array[w22]
递增 w22 并与边界 w8 = [x19+8] 比较

寄存器转储显示 x22 = 0x2b97f9（280 万），意味着循环运行了过多迭代次数。

步骤 5：结构体检查

可用证据： x19 指向结构体，x26 = x19 + 12，边界在 [x19+8]

假设： x19 处的结构体可能有损坏的字段

选择的命令： rd 0xffffff8004c1a000 4

原因：检查完整结构体并识别边界字段值

结果：

ffffff8004c1a000: 8000000000000001 0000000000000001

ffffff8004c1a010: 0000001400000028 0000000080010001

识别的结构体布局：

偏移 0x00: 0x8000000000000001 - 头/标志
偏移 0x08: 0x0000000000000001 - 计数/类型
偏移 0x10: 0x28（40），0x14（20）- 打包的维度
偏移 0x18: 0x80010001 - 这是边界字段 [x19+8]

假设如何改变：边界值 0x80010001（2,147,549,185）明显无效。回调数组的合理边界应为 4-8，而非 20 多亿。这确认了结构体损坏或未初始化内存。

步骤 6：故障地址验证

可用证据： x26 = 0xffffff8004c1a01c，故障 = 0xffffff8005700000

假设：验证数学计算确认越界访问

计算：

故障偏移 = 0xffffff8005700000 - 0xffffff8004c1a01c

= 0xae57e4 字节

数组索引 = 0xae57e4 / 4（字长）

= 0x2b97f9（2,856,953）

结果：与寄存器 x22 = 0x2b97f9 完全匹配。

分析：循环运行了 280 多万次迭代后命中未映射内存。

步骤 7：先前错误分析

可用证据：日志显示崩溃前有重复的 smcinvoke 错误

假设：错误可能指示根本原因或损坏状态

选择的命令： log | grep -A2 "smcinvoke: process_tzcb_req" | head -20

原因：理解崩溃前发生了什么错误

结果：

  smcinvoke: process_tzcb_req: Request object is not a callback object
  smcinvoke: process_tzcb_req: server is invalid
  smcinvoke: process_tzcb_req: server invalid, res: -90

分析：错误 -90（ENOTCONN 或自定义错误）和"server is invalid"消息表明 smcinvoke 子系统在崩溃前已处于损坏状态或接收格式错误的请求。

步骤 8：进程上下文

可用证据： qteeconnector@1 中崩溃，需要理解调用者

假设：多个 smcinvoke 文件描述符可能相关

选择的命令： files 932

原因：查看进程打开了哪些 smcinvoke 资源

结果：

FD 6, 7, 8: smcinvoke 设备文件

分析：进程有 3 个打开的 smcinvoke 文件描述符，表明存在多个并发的 SMC invoke 会话。

关键证据

崩溃位置

  ┌──────────┬───────────────────────────────┐
  │   项目   │              值               │
  ├──────────┼───────────────────────────────┤
  │ 函数     │ prepare_send_scm_msg+0x400    │
  ├──────────┼───────────────────────────────┤
  │ 模块     │ smcinvoke_dlkm                │
  ├──────────┼───────────────────────────────┤
  │ 指令     │ ldr w9, [x26, w22, sxtw #2]   │
  ├──────────┼───────────────────────────────┤
  │ 故障地址 │ 0xffffff8005700000            │
  ├──────────┼───────────────────────────────┤
  │ 故障类型 │ 第 3 级转换故障（未映射 PTE） │
  └──────────┴───────────────────────────────┘

崩溃时寄存器状态

 ┌────────┬────────────────────┬──────────────────────────────┐
 │ 寄存器 │         值         │             含义             │
 ├────────┼────────────────────┼──────────────────────────────┤
 │ x19    │ 0xffffff8004c1a010 │ 结构体基址                   │
 ├────────┼────────────────────┼──────────────────────────────┤
 │ x22    │ 0x00000000002b97f9 │ 循环计数器（280 万次迭代！） │
 ├────────┼────────────────────┼──────────────────────────────┤
 │ x26    │ 0xffffff8004c1a01c │ 数组基址（x19 + 12）         │
 └────────┴────────────────────┴──────────────────────────────┘

x19 处损坏的结构体


  ┌──────┬─────────────────────┬───────────────┐
  │ 偏移 │         值          │    预期值     │
  ├──────┼─────────────────────┼───────────────┤
  │ +0   │ 0x8000000000000001  │ 头            │
  ├──────┼─────────────────────┼───────────────┤
  │ +8   │ 0x80010001（21 亿） │ 小计数（4-8） │
  ├──────┼─────────────────────┼───────────────┤
  │ +12+ │ 数组数据            │ -             │
  └──────┴─────────────────────┴───────────────┘

先前错误

38+ 次"Request object is not a callback object"
多次"server is invalid, res: -90"
错误在崩溃前约 80ms 开始出现

根本原因评估

最高置信度假设

smcinvoke 驱动程序的内部请求结构体已损坏或未初始化，特别是偏移 +8 处的循环边界字段包含 0x80010001 而非有效的小计数。

证据链

结构体字段损坏：边界值 0x80010001 不是合理的数组大小。0x8001xxxx 模式表明：

- 带有调试模式的未初始化栈/内存
- use-after-free 导致的损坏
- 错误的结构体布局解释（错误转换）

循环无界运行：边界 = 21 亿，循环迭代 280 多万次后，索引 0x2b97f9 处的访问命中未映射内存。
先前错误表明系统性问题：重复的"server is invalid"和"not a callback object"错误表明 smcinvoke 子系统在崩溃前已处于损坏状态。
TrustZone 交互： qteeconnector@1 进程与 TrustZone 固件通信。来自用户空间或固件错误的格式错误请求可能损坏内核结构体。

替代假设（较低置信度）


  ┌──────────────────┬────────────────────────────┬──────────────────────┐
  │       假设       │          支持证据          │       反对证据       │
  ├──────────────────┼────────────────────────────┼──────────────────────┤
  │ Use-after-free   │ 大的损坏值                 │ 无 slab 损坏证据     │
  ├──────────────────┼────────────────────────────┼──────────────────────┤
  │ 竞争条件         │ 并发 smcinvoke 文件描述符  │ 循环计数器不应有竞争 │
  ├──────────────────┼────────────────────────────┼──────────────────────┤
  │ 用户空间恶意输入 │ qteeconnector 处理 TZ 调用 │ 应有输入验证         │
  ├──────────────────┼────────────────────────────┼──────────────────────┤
  │ 固件错误         │ SMC 调用到 TZ              │ 无 TZ 符号无法验证   │
  └──────────────────┴────────────────────────────┴──────────────────────┘

信度与局限性

置信度级别：中-高（70-80%）

为何不是更高：

无 C 源代码 - 分析基于反汇编和推断的结构体布局
drgn 不可用 - 无法以编程方式遍历内核数据结构
模块符号有限 - smcinvoke_dlkm 符号来自 KALLSYMS，无完整调试信息
无法确定损坏来源 - 未知是什么将 0x80010001 写入边界字段

提高置信度所需

完整内核/模块调试符号 - 显示确切的结构体定义
smcinvoke 驱动程序源代码 - 确认循环逻辑和预期边界
更早的转储状态 - 可显示结构体何时损坏
qteeconnector 日志 - 显示触发崩溃的请求

建议措施

立即措施

在 smcinvoke 驱动程序中添加边界验证： // 在 prepare_send_scm_msg() 中，循环前： if (request->count > MAX_CALLBACK_COUNT || request->count == 0x80010001) { pr_err("smcinvoke: 无效的回调计数 %u\n", request->count); return -EINVAL; }
在入口处添加结构体验证：

- 验证所有指针字段
- 检查幻数/签名
- 拒绝明显损坏的结构体

启用 smcinvoke 调试日志：

- 跟踪所有 ioctl 调用
- 在入口处记录结构体字段值
- 捕获触发损坏的格式错误请求

调查

从 Qualcomm/Xiaomi 获取 smcinvoke 驱动程序源代码
审查 qteeconnector 用户空间代码查找格式错误的 ioctl 调用
检查同一时间范围内的相关崩溃
启用 KASAN 以更早捕获越界访问

长期措施

添加 smcinvoke 模糊测试以测试格式错误输入
在内核中实现 smcinvoke 请求验证
考虑在内核边界进行 TrustZone 调用清理

关键命令附录

会话启动

  open_vmcore_session(dump_spec="DDRCS0_0.BIN@0x0,DDRCS0_1.BIN@0xC0000000",
                      vmlinux_path=".../vmlinux",
                      crash_args="--kaslr=0x133fa00000 -m vabits_actual=39")

初始崩溃上下文

  bt
  log | tail -n 300

模块识别

  mod smcinvoke_dlkm
  sym -m smcinvoke_dlkm | grep prepare_send

代码分析

  dis prepare_send_scm_msg

结构体检查

  rd 0xffffff8004c1a000 4
  rd 0xffffff8004c1a018 1

进程上下文

  ps | grep qteeconnector
  files 932

错误分析

  log | grep -A2 "smcinvoke: process_tzcb_req" | head -20

完整的思考过程

● I'll investigate this Linux split ramdump systematically. Let me start by validating the inputs and opening a crash session.

● Skill(ramdump-intake)
  ⎿  Successfully loaded skill

● Input Validation Complete:

  ┌────────────────┬────────────────────────────────────────────────┐
  │   Parameter    │                     Value                      │
  ├────────────────┼────────────────────────────────────────────────┤
  │ Dump mode      │ Split ramdump (2 segments)                     │
  ├────────────────┼────────────────────────────────────────────────┤
  │ dump_spec      │ DDRCS0_0.BIN@0x0 + DDRCS0_1.BIN@0xC0000000     │
  ├────────────────┼────────────────────────────────────────────────┤
  │ vmlinux_path   │ guitar_pre_global-symbols.../vmlinux           │
  ├────────────────┼────────────────────────────────────────────────┤
  │ crash_args     │ --kaslr=0x000000133fa00000 -m vabits_actual=39 │
  ├────────────────┼────────────────────────────────────────────────┤
  │ Module symbols │ Available in out/target/product/guitar/        │
  └────────────────┴────────────────────────────────────────────────┘

  Now let me open the crash session:

● crash-analysis - open_vmcore_session (MCP)(dump_spec:
                                            "/mnt/d/workspace/project/P85/20260227001/10609/DDRCS0_0.BIN@0x0000000040000000,/mnt/d/workspace/project/P85/20260227001/10609/DDRCS0_1.BIN@0x00000000c0000000",
                                            vmlinux_path: "/mnt/d/workspace/project/P85/20260227001/guitar_pre_global-symbols-vmlinux-p85-test-key-0226-userroot-13.0-c2822552d0/out/target/product/guitar/prebui
                                            lt_kernel/vmlinux", crash_args: "--kaslr=0x000000133fa00000 -m vabits_actual=39")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"session_id\": \"7f844117-0b6c-4c08-9a87-b891569bbc1b\", \"dump_mode\": \"split\", \"drgn_enabled\": false}}"
     }

● Session opened successfully:
  - Session ID: 7f844117-0b6c-4c08-9a87-b891569bbc1b
  - Dump mode: split
  - drgn_enabled: false (will use crash commands only)

  Let me start the investigation with the immediate crash context:

● crash-analysis - run_crash_command (MCP)(command: "bt", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nPID: 932      TASK: ffffff8036a0b600  CPU: 5    COMMAND: \\\"qteeconnector@1\\\"\", \"command_id\": \"crash:bt:69206263\", \"state
     \": {\"total_lines\": 2, \"returned_lines\": 2, \"truncated\": false}}}"
     }

● The bt command returned only 2 lines - just the task header, no actual backtrace. This suggests the crash may not be in this task context, or we need to see more. Let me check the kernel log for crash
  information:

● crash-analysis - run_crash_command (MCP)(command: "log | tail -n 300", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {"result":"{\"status\": \"success\", \"result\": {\"output\": \"\\n[   22.362367] smcinvoke: process_tzcb_req: Request object is not a callback object\\n[   22.362369] smcinvoke: process_tzcb_req: Re
     quest object is not a callback object\\n[   22.362371] smcinvoke: process_tzcb_req: Request object is not a callback object\\n[   22.362373] smcinvoke: process_tzcb_req: Request object is not a callb
     ack object\\n[   22.362376] smcinvoke: process_tzcb_req: Request object is not a callback object\\n[   22.362378] smcinvoke: process_tzcb_req: Request object is not a callback object\\n[   22.362380]
     … +136 lines (ctrl+o to expand)

● Excellent! The log contains rich crash information. Let me summarize the key evidence:

  Evidence:
  1. Fatal exception: Unable to handle kernel paging request at virtual address ffffff8005700000
  2. ESR: 0x96000007 - DABT (Data Abort), FSC 0x07 - level 3 translation fault
  3. Crash site: prepare_send_scm_msg+0x400/0x5c4 [smcinvoke_dlkm]
  4. Call trace:
    - prepare_send_scm_msg+0x400/0x5c4 [smcinvoke_dlkm]
    - process_invoke_req+0x2ac/0x824 [smcinvoke_dlkm]
    - smcinvoke_ioctl+0x80/0x404 [smcinvoke_dlkm]
    - __arm64_sys_ioctl+0x184/0x20c
  5. Faulting instruction: (b876db49) - appears to be a load instruction
  6. Register state at crash:
    - x0 = 0x44, x1 = 0xffffffc00e0ab6b0, x2 = 0, x3 = 0
    - x19 = 0xffffff8004c1a010, x20 = 0, x21 = 0x1000
  7. Process: PID 932 qteeconnector@1 (TrustZone connector)
  8. Kernel panic followed, stopping all CPUs

  Current hypothesis:
  The crash is a NULL pointer dereference or use-after-free in the smcinvoke_dlkm module. The address ffffff8005700000 has a PTE of 0, meaning it's unmapped memory. This is happening in prepare_send_scm_msg
  function.

  Let me examine the smcinvoke module and the specific fault site:

● crash-analysis - run_crash_command (MCP)(command: "dis prepare_send_scm_msg", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {"result":"{\"status\": \"success\", \"result\": {\"output\": \"\\n0xffffffd34bc6774c <prepare_send_scm_msg>:\\tpaciasp\\n0xffffffd34bc67750 <prepare_send_scm_msg+4>:\\tsub\\tsp, sp, #0x180\\n0xfffff
     fd34bc67754 <prepare_send_scm_msg+8>:\\tstr\\tx30, [x18], #8\\n0xffffffd34bc67758 <prepare_send_scm_msg+12>:\\tstp\\tx29, x30, [sp, #288]\\n0xffffffd34bc6775c <prepare_send_scm_msg+16>:\\tadd\\tx29,
     sp, #0x120\\n0xffffffd34bc67760 <prepare_send_scm_msg+20>:\\tstp\\tx28, x27, [sp, #304]\\n0xffffffd34bc67764 <prepare_send_scm_msg+24>:\\tstp\\tx26, x25, [sp, #320]\\n0xffffffd34bc67768 <prepare_send
     … +146 lines (ctrl+o to expand)

● The disassembly is too long. Let me focus on the specific fault site. The crash occurred at prepare_send_scm_msg+0x400 which is offset 0x400 = 1024 bytes. Looking at the disassembly, the faulting instruction
   at offset 0x400 is:

  0xffffffd34bc67b4c <prepare_send_scm_msg+1024>:       ldr     w9, [x26, w22, sxtw #2]

  This is loading from [x26 + w22*4]. Let me check the register state at crash time and examine what x26 points to:

● crash-analysis - run_crash_command (MCP)(command: "px *((struct smcinvoke_request *)0xffffffc00e0ab6b0)", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\np: gdb request failed: p *((struct smcinvoke_request *)0xffffffc00e0ab6b0)\", \"command_id\": \"crash:px:d26d49f7\", \"state\": {\
     "total_lines\": 2, \"returned_lines\": 2, \"truncated\": false}}}"
     }

● Let me check the smcinvoke module structure and examine the key pointers:

● crash-analysis - run_crash_command (MCP)(command: "bt -F", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nPID: 932      TASK: ffffff8036a0b600  CPU: 5    COMMAND: \\\"qteeconnector@1\\\"\", \"command_id\": \"crash:bt:535a7f8d\", \"state
     \": {\"total_lines\": 2, \"returned_lines\": 2, \"truncated\": false}}}"
     }

● Let me examine the smcinvoke_dlkm module and check what address x26 was pointing to. From the register dump:
  - x26 = ffffff8004c1a01c
  - x25 = ffffff8004c1a010
  - x19 = ffffff8004c1a010

  The faulting address was ffffff8005700000 which is unmapped. Let me check the smcinvoke module data:

● crash-analysis - run_crash_command (MCP)(command: "mod -S smcinvoke", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nmod: smcinvoke is not a directory\\nUsage:\\n  mod -s module [objfile] | -d module | -S [directory] [-D|-t|-r|-R|-o|-g]\\nEnter \\
     \"help mod\\\" for details.\", \"command_id\": \"crash:mod:634d7e14\", \"state\": {\"total_lines\": 5, \"returned_lines\": 5, \"truncated\": false}}}"
     }

● crash-analysis - run_crash_command (MCP)(command: "mod smcinvoke_dlkm", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {"result":"{\"status\": \"success\", \"result\": {\"output\": \"\\n     MODULE       NAME                               BASE            SIZE  OBJECT FILE\\nffffffd34754b100  qcom_apcs_ipc_mailbox
         ffffffd347548000     20480  (not loaded)  [CONFIG_KALLSYMS]\\nffffffd347550200  binder_prio                  ffffffd34754e000     20480  (not loaded)  [CONFIG_KALLSYMS]\\nffffffd347558180  qmi_he
     lpers                  ffffffd347554000     28672  (not loaded)  [CONFIG_KALLSYMS]\\nffffffd3475601c0  bootinfo                     ffffffd34755e000     16384  (not loaded)  [CONFIG_KALLSYMS]\\nfffff
     … +190 lines (ctrl+o to expand)

● I can see smcinvoke_dlkm is loaded at base ffffffd34bc5c000 with size 204800 bytes. The module list shows "(not loaded)" but this is because the symbols are from KALLSYMS.

  Let me examine the specific faulting address and the data structure being accessed. From the log:
  - Fault address: ffffff8005700000 (unmapped - PTE=0)
  - x26 = ffffff8004c1a01c
  - The crash is in prepare_send_scm_msg+0x400 which is ldr w9, [x26, w22, sxtw #2]

  This is an array access where x26 is the base and w22 is the index. Let me check what structure x26 points to:

● crash-analysis - run_crash_command (MCP)(command: "px 0xffffff8004c1a01c", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\n$1 = 0xffffff8004c1a01c\", \"command_id\": \"crash:px:b1cf48d3\", \"state\": {\"total_lines\": 2, \"returned_lines\": 2, \"truncat
     ed\": false}}}"
     }

● crash-analysis - run_crash_command (MCP)(command: "rd 0xffffff8004c1a01c -c 16", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nrd: invalid option -- 'c'\\nUsage:\\n  rd [-adDsSupxmfNR][-8|-16|-32|-64][-o offs][-e addr][-r file][address|symbol]\\n     [count
     ]\\nEnter \\\"help rd\\\" for details.\", \"command_id\": \"crash:rd:da967900\", \"state\": {\"total_lines\": 6, \"returned_lines\": 6, \"truncated\": false}}}"
     }

● crash-analysis - run_crash_command (MCP)(command: "rd 0xffffff8004c1a01c 16", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nffffff8004c1a01c:  8001000200000000 f180000000000000   ................\\nffffff8004c1a02c:  0001900000000000 0000000600000000   .
     ...............\\nffffff8004c1a03c:  0000000000000000 0000000000000000   ................\\nffffff8004c1a04c:  0000000000000000 0000000000000000   ................\\nffffff8004c1a05c:  00000000000000
     … +3 lines (ctrl+o to expand)

● I can see the data at x26. Looking at the crash:
  - x26 = 0xffffff8004c1a01c
  - The instruction ldr w9, [x26, w22, sxtw #2] loads a 32-bit word from x26 + w22*4
  - At crash: w22 = 0 (from register trace)
  - So it's loading from 0xffffff8004c1a01c + 0 = 0xffffff8004c1a01c

  But the fault address was ffffff8005700000. Let me check the register state more carefully. Looking at the log:
  - x22 = 00000000002b97f9 (this is w22 = 0x2b97f9 = 2856953)

  So the access is at: 0xffffff8004c1a01c + 0x2b97f9 * 4 = 0xffffff8004c1a01c + 0xae57e4 = 0xffffff8005700000

  This matches the fault address! The index 0x2b97f9 is way too large - this is an out-of-bounds array access caused by a corrupted or uninitialized index value.

  Let me examine the smcinvoke module's data structures to understand what's happening:

● crash-analysis - run_crash_command (MCP)(command: "nm smcinvoke_dlkm | grep prepare_send", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\ncrash: command not found: nm\", \"command_id\": \"crash:nm:607db448\", \"state\": {\"total_lines\": 2, \"returned_lines\": 2, \"tr
     uncated\": false}}}"
     }

● crash-analysis - run_crash_command (MCP)(command: "sym smcinvoke_dlkm", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nsymbol not found: smcinvoke_dlkm\\npossible alternatives:\\n  (none found)\", \"command_id\": \"crash:sym:a851b823\", \"state\": {
     \"total_lines\": 4, \"returned_lines\": 4, \"truncated\": false}}}"
     }

● Let me check the smcinvoke module structure and examine the function that calls process_tzcb_req which appears in the stack trace:

● crash-analysis - run_crash_command (MCP)(command: "dis process_tzcb_req", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  Error: result (56,971 characters) exceeds maximum allowed tokens. Output has been saved to /home/ubuntu/.claude/projects/-mnt-d-codespace-code-kernel-panic-killer/b42c085c-9e63-4211-9c70-94549c4dae9d
     /tool-results/mcp-crash-analysis-run_crash_command-1773834704848.txt.
     Format: JSON with schema: {result: string}
     … +6 lines (ctrl+o to expand)

● The disassembly is very large. Let me focus on understanding the crash. Looking at the evidence:

  Evidence:
  1. Fault: Unable to handle kernel paging request at virtual address ffffff8005700000
  2. Fault instruction: ldr w9, [x26, w22, sxtw #2] at prepare_send_scm_msg+1024
  3. Register state:
    - x26 = 0xffffff8004c1a01c (base pointer)
    - w22 = 0x2b97f9 = 2856953 (array index)
  4. Fault calculation: 0xffffff8004c1a01c + 2856953 * 4 = 0xffffff8005700000
  5. Context: Called from process_invoke_req → smcinvoke_ioctl
  6. Repeated log messages: smcinvoke: process_tzcb_req: Request object is not a callback object (38+ times)

  Current hypothesis:
  The crash is caused by an out-of-bounds array access in prepare_send_scm_msg. The index w22 = 0x2b97f9 is unreasonably large (2.8 million elements), suggesting:
  - A corrupted loop counter
  - An uninitialized variable
  - A use-after-free where the structure was freed and reallocated with garbage data

  The repeated "Request object is not a callback object" messages suggest the smcinvoke driver is receiving malformed requests or is in a corrupted state.

  Let me check the process state and examine what's calling smcinvoke:

● crash-analysis - run_crash_command (MCP)(command: "ps | grep qteeconnector", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\n>     932       1   5  ffffff8036a0b600  RU   0.1 10919288     6312  qteeconnector@1\\n     1486       1   4  ffffff805ee40000  IN
        0.1 10919288     6312  qteeconnector@1\\n     1487       1   4  ffffff805ee44800  IN   0.1 10919288     6312  qteeconnector@1\\n     1488       1   4  ffffff805ee41200  IN   0.1 10919288     6312
     … +3 lines (ctrl+o to expand)

● Good. The crashing process is qteeconnector@1 (PID 932) - this is the TrustZone connector daemon. Let me examine the smcinvoke file descriptor and ioctl context:

● crash-analysis - run_crash_command (MCP)(command: "files 932", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nPID: 932      TASK: ffffff8036a0b600  CPU: 5    COMMAND: \\\"qteeconnector@1\\\"\\nROOT: /    CWD: /\\n FD       FILE            D
     ENTRY           INODE       TYPE PATH\\n  0 ffffff8036dbba40 ffffff8009d7a410 ffffff800996b308 CHR  /dev/null\\n  1 ffffff8036dbba40 ffffff8009d7a410 ffffff800996b308 CHR  /dev/null\\n  2 ffffff8036d
     … +5 lines (ctrl+o to expand)

● The process has multiple smcinvoke file descriptors (FD 6, 7, 8). Let me examine the smcinvoke device and check for any obvious corruption patterns. Let me also look at the specific ioctl call parameters:

● crash-analysis - run_crash_command (MCP)(command: "px ((struct task_struct *)0xffffff8036a0b600)->thread_context", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\np: gdb request failed: p ((struct task_struct *)0xffffff8036a0b600)->thread_context\", \"command_id\": \"crash:px:91ff31c0\", \"st
     ate\": {\"total_lines\": 2, \"returned_lines\": 2, \"truncated\": false}}}"
     }

● Let me look at the smcinvoke module's internal structure. The key issue is understanding why w22 has such a large value. Let me check the stack trace context more carefully:

● crash-analysis - run_crash_command (MCP)(command: "dis invoke_cmd_handler+0..200", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\ndis: invalid expression: invoke_cmd_handler+0..200\", \"command_id\": \"crash:dis:e2b3443d\", \"state\": {\"total_lines\": 2, \"re
     turned_lines\": 2, \"truncated\": false}}}"
     }

● Let me check the smcinvoke module to understand the data structure layout. The crash happens when accessing an array with a corrupted index. Let me look at what x26 represents:

● crash-analysis - run_crash_command (MCP)(command: "rd 0xffffff8004c1a000 8", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nffffff8004c1a000:  8000000000000001 0000000000000001   ................\\nffffff8004c1a010:  0000001400000028 0000000080010001   (
     ...............\\nffffff8004c1a020:  0000000080010002 00000000f1800000   ................\\nffffff8004c1a030:  0000000000019000 0000000000000006   ................\", \"command_id\": \"crash:rd:59a72
     … +2 lines (ctrl+o to expand)

● Now I can see the structure better. Looking at the data:
  - 0xffffff8004c1a000: appears to be a header
  - 0xffffff8004c1a010: contains 0x28 (40) and 0x14 (20) - possibly array metadata
  - 0xffffff8004c1a01c: this is where x26 points - contains 0x80010002 and 0x80010001

  The value at x26+0 looks like 0x80010002 which could be a type/tag field. The large index 0x2b97f9 is clearly wrong.

  Let me examine the smcinvoke_dlkm module data section to understand the structure better. Let me also check what the expected array size should be:

● crash-analysis - run_crash_command (MCP)(command: "log | grep -A2 \"smcinvoke: process_tzcb_req\" | head -20", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\n[   22.278860] smcinvoke: process_tzcb_req: Request object is not a callback object\\n[   22.278864] smcinvoke: process_tzcb_req:
     server is invalid\\n[   22.278868] smcinvoke: process_tzcb_req: server invalid, res: -90\\n[   22.278872] smcinvoke: process_tzcb_req: server is invalid\\n[   22.278876] smcinvoke: process_tzcb_req:
     … +9 lines (ctrl+o to expand)

● Evidence:
  The log shows repeated errors:
  - smcinvoke: process_tzcb_req: Request object is not a callback object
  - smcinvoke: process_tzcb_req: server is invalid
  - smcinvoke: process_tzcb_req: server invalid, res: -90

  These errors started before the crash and indicate the smcinvoke driver is receiving malformed requests or is in a corrupted state. Error -90 typically means ENOTCONN (Not connected) or a custom error code.

  Let me check the smcinvoke_dlkm module structure and the relationship between the buffer and the array index:

● crash-analysis - run_crash_command (MCP)(command: "px 0xffffff8004c1a010", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\n$2 = 0xffffff8004c1a010\", \"command_id\": \"crash:px:2c86ce72\", \"state\": {\"total_lines\": 2, \"returned_lines\": 2, \"truncat
     ed\": false}}}"
     }

● Let me look at the stack to understand the local variables and the loop that leads to the crash. The function prepare_send_scm_msg has a loop that increments w22 and accesses an array. Let me check what the
  expected bounds should be:

● crash-analysis - run_crash_command (MCP)(command: "dis prepare_send_scm_msg+988..1070", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\ndis: invalid expression: prepare_send_scm_msg+988..1070\", \"command_id\": \"crash:dis:dae9aa1f\", \"state\": {\"total_lines\": 2,
      \"returned_lines\": 2, \"truncated\": false}}}"
     }

● crash-analysis - get_command_output (MCP)(command_id: "crash:dis:c848cd97", offset: 310, limit: 60)
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"0xffffffd34bc67c20 <prepare_send_scm_msg+1236>:\\tldar\\tx8, [x8]\\n0xffffffd34bc67c24 <prepare_send_scm_msg+1240>:\\tcbnz\\tx8, 0xff
     ffffd34bc67a54 <prepare_send_scm_msg+776>\\n0xffffffd34bc67c28 <prepare_send_scm_msg+1244>:\\tbl\\t0xffffffd34916cba0 <preempt_schedule_notrace>\\n0xffffffd34bc67c2c <prepare_send_scm_msg+1248>:\\tb\
     … +22 lines (ctrl+o to expand)

● Let me look at the critical code path around offset 1024 (0x400) where the crash occurs:

● crash-analysis - get_command_output (MCP)(command_id: "crash:dis:c848cd97", limit: 50, offset: 250)
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"0xffffffd34bc67b30 <prepare_send_scm_msg+996>:\\tand\\tx9, x9, #0x7\\n0xffffffd34bc67b34 <prepare_send_scm_msg+1000>:\\tadd\\tx8, x9,
      w8, uxtw\\n0xffffffd34bc67b38 <prepare_send_scm_msg+1004>:\\tadd\\tx19, x23, x8\\n0xffffffd34bc67b3c <prepare_send_scm_msg+1008>:\\tldr\\tw8, [x19, #8]\\n0xffffffd34bc67b40 <prepare_send_scm_msg+101
     … +19 lines (ctrl+o to expand)

● Now I can see the critical code path clearly:

  0xffffffd34bc67b44 <prepare_send_scm_msg+1016>:       mov     w22, wzr          // w22 = 0
  0xffffffd34bc67b48 <prepare_send_scm_msg+1020>:       add     x26, x19, #0xc      // x26 = x19 + 12 (base of array)
  0xffffffd34bc67b4c <prepare_send_scm_msg+1024>:       ldr     w9, [x26, w22, sxtw #2]  // w9 = array[w22]  <-- CRASH HERE
  0xffffffd34bc67b50 <prepare_send_scm_msg+1028>:       add     x0, sp, #0x88
  0xffffffd34bc67b54 <prepare_send_scm_msg+1032>:       ldr     w8, [x19, #4]       // w8 = count from structure
  ...
  0xffffffd34bc67b68 <prepare_send_scm_msg+1052>:       bl      0xffffffd34bc6838c <process_tzcb_req>
  0xffffffd34bc67b6c <prepare_send_scm_msg+1056>:       ldr     w8, [x19, #8]       // w8 = limit count
  0xffffffd34bc67b70 <prepare_send_scm_msg+1060>:       add     w22, w22, #0x1      // w22++
  0xffffffd34bc67b74 <prepare_send_scm_msg+1064>:       cmp     w22, w8             // compare with limit
  0xffffffd34bc67b78 <prepare_send_scm_msg+1068>:       b.cc    0xffffffd34bc67b4c  // loop if w22 < w8

  Key findings:
  1. w22 is initialized to 0 at offset+1016
  2. x26 = x19 + 12 points to an array
  3. The loop loads array[w22] and calls process_tzcb_req
  4. w8 at [x19+8] is the loop bound

  The crash shows w22 = 0x2b97f9 which is impossible if it starts at 0 and increments by 1. This means either:
  1. Memory corruption: The stack variable w22 was corrupted
  2. Use-after-free: The structure at x19 was freed and reallocated
  3. Race condition: Another CPU modified the structure

  But wait - looking at the register dump again:
  - x22 = 0x2b97f9 - this is the saved register x22, not w22 in the loop!

  Let me re-examine. The register dump shows the saved x22, not the current w22 at crash time. The actual w22 at crash might be different. Let me check what x19 points to:

● crash-analysis - run_crash_command (MCP)(command: "rd 0xffffff8004c1a010 -d 4", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nffffff8004c1a010:      85899345960      2147549185 \\nffffff8004c1a020:       2147549186      4051697664 \", \"command_id\": \"cra
     sh:rd:ce34d7ea\", \"state\": {\"total_lines\": 3, \"returned_lines\": 3, \"truncated\": false}}}"
     }

● Let me look at this more carefully. The structure at x19 (= 0xffffff8004c1a010) contains:
  - Offset 0x0: some 64-bit value
  - Offset 0x8: 0x28 (= 40 decimal) - this could be a count
  - Offset 0xc: 0x14 (= 20 decimal)
  - Offset 0x10: 0x80010001
  - Offset 0x14: 0x80010002

  Looking at the fault address calculation again:
  - x26 = x19 + 12 = 0xffffff8004c1a01c
  - Fault at 0xffffff8005700000
  - Offset = 0xffffff8005700000 - 0xffffff8004c1a01c = 0xae57e4 bytes
  - Index = 0xae57e4 / 4 = 0x2b97f9 (matches x22 in register dump!)

  So the loop ran for 2,856,953 iterations! This is impossible if the bound check at 0xffffffd34bc67b74 was working correctly. The bound at [x19+8] should have limited the loop.

  Let me check what value is at [x19+8]:

● crash-analysis - run_crash_command (MCP)(command: "rd 0xffffff8004c1a018 2", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nffffff8004c1a018:  0000000080010001 0000000080010002   ................\", \"command_id\": \"crash:rd:3139b32b\", \"state\": {\"to
     tal_lines\": 2, \"returned_lines\": 2, \"truncated\": false}}}"
     }

● So at offset 0x18 (which is x19+8 if x19=0xffffff8004c1a010), we have 0x80010001. But wait, let me recalculate. The register dump shows:
  - x19 = ffffff8004c1a010

  So:
  - [x19+8] = [0xffffff8004c1a018] = we need to read this

● crash-analysis - run_crash_command (MCP)(command: "rd 0xffffff8004c1a018 1", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nffffff8004c1a018:  0000000080010001                    ........\", \"command_id\": \"crash:rd:af69b105\", \"state\": {\"total_line
     s\": 2, \"returned_lines\": 2, \"truncated\": false}}}"
     }

● Now I see the issue more clearly. The value at [x19+8] is 0x80010001 = 2147549185 in decimal. But the code loads this as a 32-bit word (ldr w8, [x19, #8]), so w8 = 0x80010001.

  Wait, but the loop comparison is cmp w22, w8 and branch if w22 < w8. If w8 = 0x80010001, the loop would run up to 2.1 billion times!

  But actually, looking at the code flow again:
  - At +1016: w22 = 0
  - At +1020: x26 = x19 + 12
  - At +1024: ldr w9, [x26, w22, sxtw #2] - this is the FIRST load with w22=0

  But the crash dump shows x22 = 0x2b97f9. The register x22 was being used as the loop counter (w22 is the lower 32 bits of x22).

  So the loop ran for 0x2b97f9 = 2,856,953 iterations before crashing. This means:
  1. Either the bound w8 is corrupted/uninitialized
  2. Or the structure at x19 is not what the code expects

  Let me check what structure x19 points to. Looking at the earlier code:

● crash-analysis - get_command_output (MCP)(command_id: "crash:dis:c848cd97", limit: 50, offset: 230)
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"0xffffffd34bc67ae0 <prepare_send_scm_msg+916>:\\tadd\\tw9, w9, #0x1\\n0xffffffd34bc67ae4 <prepare_send_scm_msg+920>:\\tsxtw\\tx9, w9\
     \n0xffffffd34bc67ae8 <prepare_send_scm_msg+924>:\\tcmp\\tx9, x12\\n0xffffffd34bc67aec <prepare_send_scm_msg+928>:\\tb.cs\\t0xffffffd34bc67ad4 <prepare_send_scm_msg+904>  // b.hs, b.nlast\\n0xffffffd3
     … +19 lines (ctrl+o to expand)

● Now I understand the code flow better:

  At +1008: x19 = x23 + offset (calculated from earlier computation)
  At +1012: w8 = [x19+8]  // load bound
  At +1016: if (w8 == 0) goto +300  // early exit if bound is 0
  At +1020: w22 = 0  // init loop counter
  At +1024: x26 = x19 + 12  // array base
  At +1028: w9 = array[w22]  // FIRST iteration with w22=0

  But wait - the crash happened at PC=prepare_send_scm_msg+0x400 = prepare_send_scm_msg+1024. This is the FIRST load when w22 should be 0!

  Let me re-check the fault address. The register dump shows:
  - x26 = ffffff8004c1a01c
  - x22 = 00000000002b97f9

  But at the crash point (offset+1024), w22 should be 0 (just initialized at offset+1016). Unless... the crash didn't happen on the first iteration!

  Looking at the loop structure:
  - +1024: ldr w9, [x26, w22, sxtw #2] - this is inside the loop
  - +1052: bl process_tzcb_req
  - +1060: w22++
  - +1064: cmp w22, w8
  - +1068: if (w22 < w8) goto +1024

  So the crash happened on a LATER iteration when w22 had grown to 0x2b97f9. The bound w8 = [x19+8] must be >= 0x2b97f9 for the loop to continue.

  Let me check what's at [x19+8] more carefully. Looking at the data:
  ffffff8004c1a010:  0000001400000028 0000000080010001

  So:
  - [x19+0] = 0x28 (40)
  - [x19+4] = 0x14 (20)
  - [x19+8] = 0x80010001 (this is a very large number: 2,147,549,185!)

  The bound 0x80010001 is clearly wrong - it should be a small number like 4 or 8. This suggests the structure at x19 is corrupted or uninitialized.

  Let me check what x23 points to (the base structure):

● crash-analysis - run_crash_command (MCP)(command: "px 0xffffff8004c1a000", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\n$3 = 0xffffff8004c1a000\", \"command_id\": \"crash:px:958ef54a\", \"state\": {\"total_lines\": 2, \"returned_lines\": 2, \"truncat
     ed\": false}}}"
     }

● Let me look at the full structure and understand what type of data this is:

● crash-analysis - run_crash_command (MCP)(command: "rd 0xffffff8004c1a000 4", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nffffff8004c1a000:  8000000000000001 0000000000000001   ................\\nffffff8004c1a010:  0000001400000028 0000000080010001   (
     ...............\", \"command_id\": \"crash:rd:ce32dad2\", \"state\": {\"total_lines\": 3, \"returned_lines\": 3, \"truncated\": false}}}"
     }

● Now I see the structure more clearly. The data at 0xffffff8004c1a000 looks like:
  - 0x0: 0x8000000000000001 - possibly a header/flags
  - 0x8: 0x0000000000000001 - possibly a count or type
  - 0x10: 0x0000001400000028 - packed values (0x14=20, 0x28=40)
  - 0x18: 0x0000000080010001 - this is the problematic bound value

  The value 0x80010001 at offset 0x18 looks like a magic number or uninitialized memory rather than a valid count. This could be:
  1. A corrupted structure
  2. An uninitialized field
  3. A misinterpreted data structure

  Let me check if this structure is allocated from a known slab cache or if it's part of the smcinvoke driver's internal state:

● crash-analysis - run_crash_command (MCP)(command: "kmem -i | head -30", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\n                 PAGES        TOTAL      PERCENTAGE\\n    TOTAL MEM   949257       3.6 GB         ----\\n         FREE   121738
       475.5 MB   12% of TOTAL MEM\\n         USED   827519       3.2 GB   87% of TOTAL MEM\\n      BUFFERS     3860      15.1 MB    0% of TOTAL MEM\\n       CACHED   590679       2.3 GB   62% of TOTAL ME
     … +4 lines (ctrl+o to expand)

● The memory shows 151% committed which is high but not directly related to our crash. Let me examine the smcinvoke module's data structures more. The key question is: why does the structure at x19 have
  0x80010001 as the bound?

  Let me check if this is a known smcinvoke structure by looking at the module's symbol table or examining the calling context:

● crash-analysis - run_crash_command (MCP)(command: "sym -m smcinvoke_dlkm | head -50", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nffffffd34bc5c000 MODULE START: smcinvoke_dlkm\\nffffffd34bc5c000 (T) __cfi_check\\nffffffd34bc5cb58 (T) firmware_request_from_smci
     nvoke.cfi_jt\\nffffffd34bc5cb60 (T) __traceiter_process_invoke_req_result.cfi_jt\\nffffffd34bc5cb68 (T) __traceiter_release_mem_obj_locked.cfi_jt\\nffffffd34bc5cb70 (T) __traceiter_process_accept_req
     … +19 lines (ctrl+o to expand)

● Good, I can see the smcinvoke_dlkm symbols. The structure being accessed is likely an internal smcinvoke request/response structure. Let me check what calls prepare_send_scm_msg and understand the data flow:

● crash-analysis - run_crash_command (MCP)(command: "sym -m smcinvoke_dlkm | grep prepare_send", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nffffffd34bc5cb78 (T) trace_event_raw_event_prepare_send_scm_msg.f250d7a317741550755b2725b730e5f5.cfi_jt\\nffffffd34bc5cb80 (T) per
     f_trace_prepare_send_scm_msg.f250d7a317741550755b2725b730e5f5.cfi_jt\\nffffffd34bc5cb88 (T) __bpf_trace_prepare_send_scm_msg.f250d7a317741550755b2725b730e5f5.cfi_jt\\nffffffd34bc5cbb8 (T) __traceiter
     … +9 lines (ctrl+o to expand)

● Let me find what function calls prepare_send_scm_msg:

● crash-analysis - run_crash_command (MCP)(command: "sym -m smcinvoke_dlkm | grep -i \"invoke_cmd\"", session_id: "7f844117-0b6c-4c08-9a87-b891569bbc1b")
  ⎿  {
       "result": "{\"status\": \"success\", \"result\": {\"output\": \"\\nffffffd34bc5cca8 (T) __traceiter_invoke_cmd_handler.cfi_jt\\nffffffd34bc5cdd8 (T) perf_trace_invoke_cmd_handler.f250d7a31774155075
     5b2725b730e5f5.cfi_jt\\nffffffd34bc5cde0 (T) trace_event_raw_event_invoke_cmd_handler.f250d7a317741550755b2725b730e5f5.cfi_jt\\nffffffd34bc5cde8 (T) __bpf_trace_invoke_cmd_handler.f250d7a317741550755
     … +9 lines (ctrl+o to expand)

● Based on my analysis, I have gathered sufficient evidence to understand the root cause. Let me now generate the final report.

● Skill(report-writer)
  ⎿  Successfully loaded skill

● Now let me write the final report based on the investigation:

  ---
  Linux Kernel Crash Analysis Report

  1. Executive Summary

  Crash Type: Data Abort Exception (DABT) - Level 3 Translation Fault
  Faulting Process: qteeconnector@1 (PID 932) - TrustZone Connector Daemon
  Faulting Module: smcinvoke_dlkm (SMC Invoke Driver)
  Root Cause: Out-of-bounds array access in prepare_send_scm_msg() due to a corrupted structure field containing an invalid bound value (0x80010001 instead of a small count like 4-8).

  The crash occurred when iterating over an array of callback request objects. The loop bound field at [structure+8] contained 0x80010001 (2,147,549,185), causing the loop to run millions of iterations past
  the allocated array bounds, ultimately accessing unmapped memory at 0xffffff8005700000.

  ---
  2. Analyzed Artifacts

  ┌────────────────┬───────────────────────────────────────────────────────────────────────────┐
  │    Artifact    │                                   Value                                   │
  ├────────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ Dump Mode      │ Split ramdump (2 segments)                                                │
  ├────────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ dump_spec      │ DDRCS0_0.BIN@0x0, DDRCS0_1.BIN@0xC0000000                                 │
  ├────────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ vmlinux_path   │ guitar_pre_global-symbols-vmlinux-p85-test-key-0226-userroot-13.0/vmlinux │
  ├────────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ crash_args     │ --kaslr=0x133fa00000 -m vabits_actual=39                                  │
  ├────────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ Module Symbols │ Available in out/target/product/guitar/                                   │
  ├────────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ Session ID     │ 7f844117-0b6c-4c08-9a87-b891569bbc1b                                      │
  ├────────────────┼───────────────────────────────────────────────────────────────────────────┤
  │ drgn Enabled   │ No (crash commands only)                                                  │
  └────────────────┴───────────────────────────────────────────────────────────────────────────┘

  ---
  3. Session Mode and Constraints

  - Split ramdump required using dump_spec parameter instead of vmcore_path
  - KASLR offset 0x133fa00000 applied for symbol resolution
  - VABITS=39 indicates 39-bit virtual addressing (512GB VA space)
  - drgn unavailable - investigation performed using crash built-in commands only
  - Module symbols loaded from KALLSYMS (smcinvoke_dlkm base: 0xffffffd34bc5c000)

  ---
  4. Investigation Process and Command-by-Command Reasoning

  Step 1: Initial Backtrace

  Evidence available: Session just opened, no prior information
  Hypothesis: Need to identify crash site and context
  Command chosen: bt
  Reason: Standard first step to identify the crashing function and call stack

  Result:
  PID: 932  TASK: ffffff8036a0b600  CPU: 5  COMMAND: "qteeconnector@1"

  Analysis: The bt command returned only the task header without a full stack trace, indicating the crash context needed to be obtained from the kernel log.

  ---
  Step 2: Kernel Log Examination

  Evidence available: Single-line bt output, need more crash context
  Hypothesis: Kernel log should contain the full oops message and register state
  Command chosen: log | tail -n 300
  Reason: The log buffer contains the complete crash dump including register state, call trace, and any preceding error messages

  Result: Rich evidence obtained:
  - Full oops message with register dump
  - Call trace through smcinvoke_dlkm
  - Repeated error messages before crash
  - Kernel panic and CPU stop traces

  How this changed the hypothesis: The log revealed this was a paging fault at 0xffffff8005700000 in prepare_send_scm_msg+0x400, with preceding errors about "Request object is not a callback object" and
  "server is invalid, res: -90".

  ---
  Step 3: Module Identification

  Evidence available: Crash in smcinvoke_dlkm, need module base and symbols
  Hypothesis: smcinvoke_dlkm is a kernel module; need to confirm it's loaded
  Command chosen: mod smcinvoke_dlkm
  Reason: To verify module load status and obtain base address for symbol resolution

  Result:
  ffffffd34bc74d80  smcinvoke_dlkm  ffffffd34bc5c000  204800

  Analysis: Module confirmed loaded at 0xffffffd34bc5c000 with size 200KB.

  ---
  Step 4: Disassembly of Faulting Function

  Evidence available: Crash at prepare_send_scm_msg+0x400, need to understand the code
  Hypothesis: The faulting instruction should reveal what memory access failed
  Command chosen: dis prepare_send_scm_msg
  Reason: To identify the exact instruction at offset 0x400 and understand the data flow

  Result: Key code path identified:
  0xffffffd34bc67b44 <+1016>: mov     w22, wzr              // w22 = 0 (init counter)
  0xffffffd34bc67b48 <+1020>: add     x26, x19, #0xc        // x26 = array base
  0xffffffd34bc67b4c <+1024>: ldr     w9, [x26, w22, sxtw #2]  // w9 = array[w22] <-- CRASH
  0xffffffd34bc67b54 <+1032>: ldr     w8, [x19, #4]
  ...
  0xffffffd34bc67b68 <+1052>: bl      process_tzcb_req
  0xffffffd34bc67b6c <+1056>: ldr     w8, [x19, #8]         // w8 = bound
  0xffffffd34bc67b70 <+1060>: add     w22, w22, #1          // w22++
  0xffffffd34bc67b74 <+1064>: cmp     w22, w8
  0xffffffd34bc67b78 <+1068>: b.cc    <+1024>               // loop while w22 < w8

  How this changed the hypothesis: The crash is in a loop that:
  1. Initializes w22 = 0
  2. Sets x26 = x19 + 12 as array base
  3. Loads array[w22] each iteration
  4. Increments w22 and compares against bound w8 = [x19+8]

  The register dump showed x22 = 0x2b97f9 (2.8 million), meaning the loop ran far too many iterations.

  ---
  Step 5: Structure Examination

  Evidence available: x19 points to structure, x26 = x19 + 12, bound at [x19+8]
  Hypothesis: The structure at x19 may have corrupted fields
  Command chosen: rd 0xffffff8004c1a000 4
  Reason: To examine the full structure and identify the bound field value

  Result:
  ffffff8004c1a000:  8000000000000001 0000000000000001
  ffffff8004c1a010:  0000001400000028 0000000080010001

  Structure layout identified:
  - Offset 0x00: 0x8000000000000001 - header/flags
  - Offset 0x08: 0x0000000000000001 - count/type
  - Offset 0x10: 0x28 (40), 0x14 (20) - packed dimensions
  - Offset 0x18: 0x80010001 - THIS IS THE BOUND FIELD [x19+8]

  How this changed the hypothesis: The bound value 0x80010001 (2,147,549,185) is clearly invalid. A reasonable bound for a callback array would be 4-8, not 2+ billion. This confirmed structure corruption or
  uninitialized memory.

  ---
  Step 6: Fault Address Verification

  Evidence available: x26 = 0xffffff8004c1a01c, fault = 0xffffff8005700000
  Hypothesis: Verify the math confirms out-of-bounds access
  Calculation:
  Fault offset from array base = 0xffffff8005700000 - 0xffffff8004c1a01c
                              = 0xae57e4 bytes
  Array index                  = 0xae57e4 / 4 (word size)
                              = 0x2b97f9 (2,856,953)

  Result: Matches register x22 = 0x2b97f9 exactly.

  Analysis: The loop ran for 2.8+ million iterations before hitting unmapped memory.

  ---
  Step 7: Preceding Error Analysis

  Evidence available: Log shows repeated smcinvoke errors before crash
  Hypothesis: Errors may indicate root cause or corrupted state
  Command chosen: log | grep -A2 "smcinvoke: process_tzcb_req" | head -20
  Reason: To understand what errors preceded the crash

  Result:
  smcinvoke: process_tzcb_req: Request object is not a callback object
  smcinvoke: process_tzcb_req: server is invalid
  smcinvoke: process_tzcb_req: server invalid, res: -90

  Analysis: Error -90 (ENOTCONN or custom error) and "server is invalid" messages indicate the smcinvoke driver was receiving malformed requests or operating on corrupted internal state before the crash.

  ---
  Step 8: Process Context

  Evidence available: Crash in qteeconnector@1, need to understand the caller
  Hypothesis: Multiple smcinvoke file descriptors may be relevant
  Command chosen: files 932
  Reason: To see what smcinvoke resources the process had open

  Result:
  FD 6, 7, 8: smcinvoke device files

  Analysis: Process had 3 smcinvoke file descriptors open, suggesting multiple concurrent SMC invoke sessions.

  ---
  5. Key Evidence

  Crash Location

  ┌───────────────┬──────────────────────────────────────────┐
  │     Item      │                  Value                   │
  ├───────────────┼──────────────────────────────────────────┤
  │ Function      │ prepare_send_scm_msg+0x400               │
  ├───────────────┼──────────────────────────────────────────┤
  │ Module        │ smcinvoke_dlkm                           │
  ├───────────────┼──────────────────────────────────────────┤
  │ Instruction   │ ldr w9, [x26, w22, sxtw #2]              │
  ├───────────────┼──────────────────────────────────────────┤
  │ Fault Address │ 0xffffff8005700000                       │
  ├───────────────┼──────────────────────────────────────────┤
  │ Fault Type    │ Level 3 Translation Fault (unmapped PTE) │
  └───────────────┴──────────────────────────────────────────┘

  Register State at Crash

  ┌──────────┬────────────────────┬─────────────────────────────────┐
  │ Register │       Value        │             Meaning             │
  ├──────────┼────────────────────┼─────────────────────────────────┤
  │ x19      │ 0xffffff8004c1a010 │ Structure base                  │
  ├──────────┼────────────────────┼─────────────────────────────────┤
  │ x22      │ 0x00000000002b97f9 │ Loop counter (2.8M iterations!) │
  ├──────────┼────────────────────┼─────────────────────────────────┤
  │ x26      │ 0xffffff8004c1a01c │ Array base (x19 + 12)           │
  └──────────┴────────────────────┴─────────────────────────────────┘

  Corrupted Structure at x19

  ┌────────┬────────────────────┬───────────────────┐
  │ Offset │       Value        │     Expected      │
  ├────────┼────────────────────┼───────────────────┤
  │ +0     │ 0x8000000000000001 │ Header            │
  ├────────┼────────────────────┼───────────────────┤
  │ +8     │ 0x80010001 (2.1B)  │ Small count (4-8) │
  ├────────┼────────────────────┼───────────────────┤
  │ +12+   │ Array data         │ -                 │
  └────────┴────────────────────┴───────────────────┘

  Preceding Errors

  - 38+ occurrences of "Request object is not a callback object"
  - Multiple "server is invalid, res: -90" messages
  - Errors started ~80ms before crash

  ---
  6. Root Cause Assessment

  Highest Confidence Hypothesis

  The smcinvoke driver's internal request structure was corrupted or uninitialized, specifically the loop bound field at offset +8 containing 0x80010001 instead of a valid small count.

  Evidence Chain

  7. Structure field corruption: The bound value 0x80010001 is not a plausible array size. The pattern 0x8001xxxx suggests either:
    - Uninitialized stack/memory with debug pattern
    - Corrupted field from use-after-free
    - Misinterpreted structure layout (wrong cast)
  8. Loop ran unbounded: With bound = 2.1 billion, the loop iterated 2.8+ million times before the access at index 0x2b97f9 hit unmapped memory.
  9. Preceding errors indicate systemic issue: The repeated "server is invalid" and "not a callback object" errors suggest the smcinvoke subsystem was already in a corrupted state before this crash.
  10. TrustZone interaction: The qteeconnector@1 process communicates with TrustZone firmware. Malformed requests from userspace or firmware bugs could corrupt kernel structures.

  Alternative Hypotheses (Lower Confidence)

  ┌───────────────────────────┬────────────────────────────────┬──────────────────────────────────┐
  │        Hypothesis         │          Evidence For          │         Evidence Against         │
  ├───────────────────────────┼────────────────────────────────┼──────────────────────────────────┤
  │ Use-after-free            │ Large corrupted value          │ No slab corruption evidence      │
  ├───────────────────────────┼────────────────────────────────┼──────────────────────────────────┤
  │ Race condition            │ Concurrent smcinvoke FDs       │ Loop counter shouldn't be racy   │
  ├───────────────────────────┼────────────────────────────────┼──────────────────────────────────┤
  │ Userspace malicious input │ qteeconnector handles TZ calls │ Would expect input validation    │
  ├───────────────────────────┼────────────────────────────────┼──────────────────────────────────┤
  │ Firmware bug              │ SMC calls to TZ                │ Cannot verify without TZ symbols │
  └───────────────────────────┴────────────────────────────────┴──────────────────────────────────┘

  ---
  11. Confidence and Limitations

  Confidence Level: Medium-High (70-80%)

  Why not higher:
  12. No C source code - Analysis based on disassembly and inferred structure layout
  13. drgn unavailable - Could not programmatically traverse kernel data structures
  14. Module symbols limited - smcinvoke_dlkm symbols from KALLSYMS, no full debug info
  15. Cannot determine corruption origin - Unknown what wrote 0x80010001 to the bound field

  What Would Increase Confidence

  16. Full kernel/module debug symbols - Would show exact structure definitions
  17. smcinvoke driver source - Would confirm the loop logic and expected bounds
  18. Earlier dump state - Could show when structure became corrupted
  19. qteeconnector logs - Would show what requests triggered the crash

  ---
  20. Recommended Actions

  Immediate

  21. Add bounds validation in smcinvoke driver:
  // In prepare_send_scm_msg(), before loop:
  if (request->count > MAX_CALLBACK_COUNT || request->count == 0x80010001) {
      pr_err("smcinvoke: invalid callback count %u\n", request->count);
      return -EINVAL;
  }
  22. Add structure validation on entry:
    - Validate all pointer fields
    - Check magic numbers/signatures
    - Reject obviously corrupted structures
  23. Enable smcinvoke debug logging:
    - Trace all ioctl calls
    - Log structure field values on entry
    - Capture the malformed request that triggers corruption

  Investigation

  24. Obtain smcinvoke driver source from Qualcomm/Xiaomi
  25. Review qteeconnector userspace code for malformed ioctl calls
  26. Check for related crashes in the same timeframe
  27. Enable KASAN to catch out-of-bounds earlier

  Long-term

  28. Add smcinvoke fuzzing to test malformed inputs
  29. Implement smcinvoke request validation in kernel
  30. Consider TrustZone call sanitization at kernel boundary

  ---
  31. Key Command Appendix

  # Session startup
  open_vmcore_session(dump_spec="DDRCS0_0.BIN@0x0,DDRCS0_1.BIN@0xC0000000",
                      vmlinux_path=".../vmlinux",
                      crash_args="--kaslr=0x133fa00000 -m vabits_actual=39")

  # Initial crash context
  bt
  log | tail -n 300

  # Module identification
  mod smcinvoke_dlkm
  sym -m smcinvoke_dlkm | grep prepare_send

  # Code analysis
  dis prepare_send_scm_msg

  # Structure examination
  rd 0xffffff8004c1a000 4
  rd 0xffffff8004c1a018 1

  # Process context
  ps | grep qteeconnector
  files 932

  # Error analysis
  log | grep -A2 "smcinvoke: process_tzcb_req" | head -20

  ---
  Report Generated: 2026-03-18
  Session ID: 7f844117-0b6c-4c08-9a87-b891569bbc1b
  Analyst: crash-mcp automated analysis

报告生成日期： 2026-03-18

会话 ID： 7f844117-0b6c-4c08-9a87-b891569bbc1b

分析师： bsp-stability-tool by @iliuqi

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