MTK camera plugin 算法中 mutex 锁导致camerahalserver AEE_AED

1.线程调试mutex问题分析

1.打印线程号、进程号、线程名字

#include <sys/syscall.h>
#include <sys/prctl.h>

int tid = syscall(SYS_gettid);
int pid = syscall(SYS_getpid);
char name[32];
prctl(PR_GET_NAME,name);

2.打印调用堆栈

head file

#include <utils/CallStack.h>

cpp file

Plugin::relese(void)
{
    android::CallStack stack("test");
}

file

#debug stack
LOCAL_C_INCLUDES += $(TOP)/system/core/libutils/include

LOCAL_SHARED_LIBRARIES += libutilscallstack

3.打印 AEE_AED backtrace

错误log

05-18 08:33:45.907 I/AEE_AED ( 2416): backtrace:
05-18 08:33:45.907 I/AEE_AED ( 2416):     #00 pc 0001cc86  /system/lib/libc.so (abort+58)
05-18 08:33:45.907 I/AEE_AED ( 2416):     #01 pc 00064553  /system/lib/libc.so (__fortify_fatal(char const*, ...)+26)
05-18 08:33:45.907 I/AEE_AED ( 2416):     #02 pc 00063d55  /system/lib/libc.so (HandleUsingDestroyedMutex(pthread_mutex_t*, char const*)+20)
05-18 08:33:45.907 I/AEE_AED ( 2416):     #03 pc 00063c83  /system/lib/libc.so (pthread_mutex_lock+214)
05-18 08:33:45.908 I/AEE_AED ( 2416):     #04 pc 00010cd5  /vendor/lib/libmtkcam_imgbuf.so
05-18 08:33:45.908 I/AEE_AED ( 2416):     #05 pc 00010edb  /vendor/lib/libmtkcam_imgbuf.so
05-18 08:33:45.908 I/AEE_AED ( 2416):     #06 pc 000499ab  /vendor/lib/libcam.iopipe.so
05-18 08:33:45.908 I/AEE_AED ( 2416):     #07 pc 0004926b  /vendor/lib/libcam.iopipe.so

打印so库对应的函数与文件的命令如下(随意写了个)

1. cd out/target/product/xxxxx/symbols/vendor/lib64
2. addr2line -f -e libcam.iopipe.so 49139

问题分析：

--------- beginning of crash
05-18 08:33:45.428 F/libc    (  445): FORTIFY: pthread_mutex_lock called on a destroyed mutex (0xa6f2f608)

E/MtkCam/ImgBuf(  445):  BaseImageBuffer::~BaseImageBuffer()!!!!!!!!!!!!!!  this:0xa6f2f600  mLockMtx:0xa6f2f608 name:MDP@CapPipe  tid:2388 pid:445 ~BaseImageBuffer 89
05-18 08:33:45.427 E/MtkCam/ImgBuf(  445):  index:0 this:0xa6f2f600  mLockMtx:0xa6f2f608 name:YUV@CapPipe  tid:2387 pid:445 getBufOffsetInBytes 395 
05-18 08:33:45.427 I/ULog    (  445): R AppRequest:365 M[CameraDevice:187001] +  :mtkcam-dev3 #720
--------- beginning of crash
05-18 08:33:45.428 F/libc    (  445): FORTIFY: pthread_mutex_lock called on a destroyed mutex (0xa6f2f608)

其中YUV@CapPipe 线程的 mutex 被 MDP@CapPipe 释放。

到此为止就大概确定了问题的位置，具体不同的问题需要不同的分析，这里就不在叙述。