Crashes when app throws an exception

[aguludunu]

My app can run with libmemory_profiler.so very well but it crashes when it throws an exception.

GCC : 7.4.0
Compile : g++ -Wall -Wextra -g -ggdb -O0 test.cpp -pthread
Run : sudo LD_PRELOAD=./libmemory_profiler.so ./a.out
Code : (I don't know how to make the code pretty, it looks suck.)

#include <unistd.h>
#include <stdio.h>
#include <sys/syscall.h>

#include   <array>
#include   <vector>
#include   <thread>
#include   <random>

using namespace std;

// Init random generator
mt19937 rand_generator(chrono::high_resolution_clock::now().time_since_epoch().count());
uniform_int_distribution<int> dist(100,1000);

class A {
public: 
    A() {   
        data_.push_back(0);
        data_.push_back(1);
        data_.push_back(2);
    }
private:
    vector<int> data_;
};
// Set a global value and it may alloca memory before main()
A a;

void ThreadEntry() {
    while(true) {   
        char*p = new char[128];
        *p += 1;
        
        try {
            if(0 == dist(rand_generator) % 2) {
                //throw "Throw a exception";   //crashes when it runs
                delete [] p;
            }
        } catch (const char* msg) {
            printf("catch exception [%s]\n", msg);
        }
        
        this_thread::sleep_for(chrono::milliseconds(10));
    }
}

int main() {

    array<thread, 1> thread_pool;
    
    for(auto &th : thread_pool)
        th = thread(ThreadEntry);
    
    for(auto &th : thread_pool)
        th.join();
}

Backtrace:

(gdb) bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007ffff6cca801 in __GI_abort () at abort.c:79
#2  0x00007ffff753e957 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#3  0x00007ffff7544ab6 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#4  0x00007ffff7544af1 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5  0x00007ffff7544d24 in __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x00005555555551c9 in ThreadEntry () at test.cpp:42
#7  0x00005555555563b3 in std::__invoke_impl<void, void (*)()> (__f=@0x55555576e098: 0x55555555514a <ThreadEntry()>) at /usr/include/c++/7/bits/invoke.h:60
#8  0x0000555555555dd1 in std::__invoke<void (*)()> (__fn=@0x55555576e098: 0x55555555514a <ThreadEntry()>) at /usr/include/c++/7/bits/invoke.h:95
#9  0x000055555555764a in std::thread::_Invoker<std::tuple<void (*)()> >::_M_invoke<0ul> (this=0x55555576e098) at /usr/include/c++/7/thread:234
#10 0x0000555555557606 in std::thread::_Invoker<std::tuple<void (*)()> >::operator() (this=0x55555576e098) at /usr/include/c++/7/thread:243
#11 0x00005555555575d6 in std::thread::_State_impl<std::thread::_Invoker<std::tuple<void (*)()> > >::_M_run (this=0x55555576e090) at /usr/include/c++/7/thread:186
#12 0x00007ffff756f66f in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#13 0x00007ffff70826db in start_thread (arg=0x7fffeffff700) at pthread_create.c:463
#14 0x00007ffff6dab88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

[koute]

Thanks for the report!

Hmm... interesting. It looks like the newer versions of libstdc++ have _Unwind_RaiseException statically linked... This is problematic. I'll have to think about how to work around this.

In the meantime you can turn off the shadow stack-based unwinding by doing this:

export MEMORY_PROFILER_USE_SHADOW_STACK=0

and then run the profiler. It will be slower, but it should work until I'll fix this properly.

[koute]

Should be fixed on master.