gcc8之前，coredump文件无法显示正确的函数调用栈信息

原创

安安爸Chris 2022-01-09 15:14:15 ©著作权

文章标签 c++ libstdc++ #include 函数栈 文章分类 C/C++ 后端开发

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在c++里，如果在Thread中有未捕获的异常，那么gcc会主动catch该异常，从而导致函数栈中无有用的信息。

下面是一个例子

#include <stdexcept>
#include <thread>
void foo()
{
    throw std::runtime_error("foo");
}

void subroutine() {
    std::thread t(foo);
    t.join();
}

int main()
{
    std::thread t(subroutine);
    t.join();
}

这里仅仅指的是c++中定义的异常，以及子类；如果是错误，比如说除以零，这种是可以直接抛出来的

使用编译命令

g++ -Wall -std=c++0x -g tmp.cpp

然后使用gdb执行

gdb a.out

(gdb) r
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7ffff7dc1700 (LWP 2427)]
terminate called after throwing an instance of 'std::runtime_error'
  what():  foo

运行bt调出函数栈信息，发现没有有效的内容

Program received signal SIGABRT, Aborted.
   [Switching to Thread 0x7ffff7dc1700 (LWP 2427)]
   0x00000034906362a5 in raise () from /lib64/libc.so.6
   Missing separate debuginfos, use: debuginfo-install
   boost-thread-1.47.0-3.fc16.x86_64 glibc-2.14.90-14.x86_64
   libgcc-4.6.2-1.fc16.x86_64 libstdc++-4.6.2-1.fc16.x86_64
   (gdb) bt
   #0  0x00000034906362a5 in raise () from /lib64/libc.so.6
   #1  0x0000003490637bbb in abort () from /lib64/libc.so.6
   #2  0x000000349aabbf8d in __gnu_cxx::__verbose_terminate_handler()
   () from /usr/lib64/libstdc++.so.6
   #3  0x000000349aaba146 in ?? () from /usr/lib64/libstdc++.so.6
   #4  0x000000349aaba173 in std::terminate() () from
   /usr/lib64/libstdc++.so.6
   #5  0x000000349aa70bdb in ?? () from /usr/lib64/libstdc++.so.6
   #6  0x0000003490a07d90 in start_thread () from /lib64/libpthread.so.0
   #7  0x00000034906eeddd in clone () from /lib64/libc.so.6

解决方案

改用boost::thread

#include <stdexcept>
#include <thread>
void foo()
{
    throw std::runtime_error("foo");
}

void subroutine() {
    boost::thread t(foo);
    t.join();
}

int main()
{
    boost::thread t(subroutine);
    t.join();
}

改用pthread

#include <stdexcept>
//#include <thread>
void *foo(void *)
{
    throw std::runtime_error("foo");
}

void *subroutine(void *a) {
    pthread_t thread_id;
    pthread_create(&thread_id, NULL, foo, NULL);
    pthread_join(thread_id,NULL);

    return NULL;
}

int main()
{
    pthread_t thread_id;
    pthread_create(&thread_id, NULL, subroutine, NULL);
    pthread_join(thread_id,NULL);

    return 0;
}

这时的函数栈可以显示到对应的crash函数了

#0  0x00007f1b7840b1f7 in raise () from /lib64/libc.so.6
#1  0x00007f1b7840c8e8 in abort () from /lib64/libc.so.6
#2  0x00007f1b78d11a95 in __gnu_cxx::__verbose_terminate_handler() ()
   from /lib64/libstdc++.so.6
#3  0x00007f1b78d0fa06 in ?? () from /lib64/libstdc++.so.6
#4  0x00007f1b78d0fa33 in std::terminate() () from /lib64/libstdc++.so.6
#5  0x00007f1b78d0fc53 in __cxa_throw () from /lib64/libstdc++.so.6
#6  0x00000000004007bb in foo ()
    at main.cpp:5
#7  0x00007f1b78fc0e25 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f1b784ce34d in clone () from /lib64/libc.so.6