Hi, under some stress (10 downlaoding requests per sec) my program
(described in this thread) occasionally crashes with segmentation fault
(SIGSEGV).
Can you help me resolve this issue?
(gdb) info threads
Id Target Id Frame
* 1 Thread 0x7f58cffff700 (LWP 10505) 0x00007f58ea4a8765 in raise () from
/lib64/libc.so.6
2 Thread 0x7f58ec434980 (LWP 10496) 0x00007f58ea842bd0 in
pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
3 Thread 0x7f58e6e56700 (LWP 10500) 0x00007f58ea577307 in epoll_pwait
() from /lib64/libc.so.6
4 Thread 0x7f58e7e58700 (LWP 10498) 0x00007f58ea845afd in
__lll_lock_wait () from /lib64/libpthread.so.0
5 Thread 0x7f58e8659700 (LWP 10497) 0x00007f58ea577307 in epoll_pwait
() from /lib64/libc.so.6
6 Thread 0x7f58cf7fe700 (LWP 10506) 0x00007f58ea56722d in write () from
/lib64/libc.so.6
7 Thread 0x7f58e7657700 (LWP 10499) 0x00007f58ea577307 in epoll_pwait
() from /lib64/libc.so.6
8 Thread 0x7f58e6655700 (LWP 10501) 0x00007f58ea577307 in epoll_pwait
() from /lib64/libc.so.6
9 Thread 0x7f58e5e54700 (LWP 10502) 0x00007f58ea577307 in epoll_pwait
() from /lib64/libc.so.6
10 Thread 0x7f58e4e52700 (LWP 10504) 0x00007f58ea577307 in epoll_pwait
() from /lib64/libc.so.6
11 Thread 0x7f58e5653700 (LWP 10503) 0x00007f58ea577307 in epoll_pwait
() from /lib64/libc.so.6
thread 1 stack:
#0 0x00007f58ea4a8765 in raise () from /lib64/libc.so.6
#1 0x00007f58ea4aa483 in abort () from /lib64/libc.so.6
#2 0x00000000004b7a23 in MagickPanicSignalHandler (signo=11) at
magick/magick.c:835
#3 <signal handler called>
#4 0x0000000000813162 in heap_remove (less_than=0x812fc0
<timer_less_than>, node=0x7ffddd63ec98, heap=0xc28a28
<default_loop_struct+520>) at ./src/heap-inl.h:187
#5 uv_timer_stop (handle=0x7ffddd63ec30) at src/unix/timer.c:97
#6 0x000000000081341d in uv_timer_start (handle=0xffffffffffffff98,
cb=<optimized out>, timeout=<optimized out>, repeat=<optimized out>) at
src/unix/timer.c:87
#7 0x00007ffddd63ebf0 in ?? ()
#8 0x0000000000417c74 in
imageresizer::engine::FileDownloader::start_timeout (this=0x1f1,
multi=0x7f58eb73ca60, timeout_ms=140019881360094) at
src/engine/FileDownloader.cpp:249
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
In the same project I'm using GraphicsMagick that registers its own signal
handler hence frame #2, but still it looks like uv_timer_stop throws SIGSEGV
thread 2 is gRPC server thread, thread 3 is gRPC's completion queue thread
thread 4 is locked on curl multi handle during on_timeout callback:
(gdb) bt
#0 0x00007f58ea845afd in __lll_lock_wait () from /lib64/libpthread.so.0
#1 0x00007f58ea83fa0d in pthread_mutex_lock () from /lib64/libpthread.so.0
#2 0x0000000000416d81 in __gthread_mutex_lock (__mutex=0x7ffddd63ed70) at
/usr/include/c++/6.3.1/x86_64-redhat-linux/bits/gthr-default.h:748
#3 0x0000000000418032 in std::mutex::lock (this=0x7ffddd63ed70) at
/usr/include/c++/6.3.1/bits/std_mutex.h:101
#4 0x0000000000418209 in imageresizer::util::Lock::Lock
(this=0x7f58e7e57a70, m=...) at ./src/util/Lock.h:21
#5 0x0000000000417b77 in imageresizer::engine::FileDownloader::on_timeout
(this=0x7ffddd63ebf0, handle=0x7ffddd63ec30) at
src/engine/FileDownloader.cpp:230
#6 0x0000000000417b48 in
imageresizer::engine::FileDownloader::on_timeout_cb (handle=0x7ffddd63ec30)
at src/engine/FileDownloader.cpp:223
#7 0x0000000000813515 in uv__run_timers (loop=0x7ffddd63ed70) at
src/unix/timer.c:159
#8 0x000000000080bf3c in uv__update_time (loop=0xc28820
<default_loop_struct>) at src/unix/internal.h:316
#9 uv_run (loop=0xc28820 <default_loop_struct>, mode=UV_RUN_DEFAULT) at
src/unix/core.c:342
#10 0x0000000000417474 in imageresizer::engine::FileDownloader::StartLoop
(this=0x7ffddd63ebf0) at src/engine/FileDownloader.cpp:96
#11 0x000000000041979a in std::__invoke_impl<void, void
(imageresizer::engine::FileDownloader::* const&)(),
imageresizer::engine::FileDownloader*>(std::__invoke_memfun_deref, void
(imageresizer::engine::FileDownloader::* const&)(), image
resizer::engine::FileDownloader*&&) (
__f=@0x1a323f0: (void (imageresizer::engine::FileDownloader::*)(
imageresizer::engine::FileDownloader * const)) 0x4173e4 <imageresizer::
engine::FileDownloader::Add(std::__cxx11::basic_string<char, std::
char_traits<char>, std::allocato
r<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::
allocator<char> >, std::function<void ()>, std::function<void (imageresizer
::DownloadFileError const&)>)+670>,
__t=<unknown type in /opt/WP/imageresizer-worker/dist/Debug/GNU-Linux/
imageresizer-worker, CU 0x1cd0b, DIE 0x2a784>) at /usr/include/c++/6.3.1/
functional:227
#12 0x0000000000419727 in std::__invoke<void
(imageresizer::engine::FileDownloader::* const&)(),
imageresizer::engine::FileDownloader*>(void
(imageresizer::engine::FileDownloader::* const&)(),
imageresizer::engine::FileDownloader*&&) (
__fn=@0x1a323f0: (void (imageresizer::engine::FileDownloader::*)(
imageresizer::engine::FileDownloader * const)) 0x4173e4 <imageresizer::
engine::FileDownloader::Add(std::__cxx11::basic_string<char, std::
char_traits<char>, std::allocat
or<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::
allocator<char> >, std::function<void ()>, std::function<void (imageresizer
::DownloadFileError const&)>)+670>,
__args#0=<unknown type in
/opt/WP/imageresizer-worker/dist/Debug/GNU-Linux/imageresizer-worker, CU
0x1cd0b, DIE 0x2a784>) at /usr/include/c++/6.3.1/functional:251
#13 0x00000000004196d8 in std::_Mem_fn_base<void
(imageresizer::engine::FileDownloader::*)(),
true>::operator()<imageresizer::engine::FileDownloader*>(imageresizer::engine::FileDownloader*&&)
const (this=0x1a323f0,
__args#0=<unknown type in
/opt/WP/imageresizer-worker/dist/Debug/GNU-Linux/imageresizer-worker, CU
0x1cd0b, DIE 0x2a784>) at /usr/include/c++/6.3.1/functional:604
#14 0x00000000004196a3 in std::_Bind_simple<std::_Mem_fn<void
(imageresizer::engine::FileDownloader::*)()>
(imageresizer::engine::FileDownloader*)>::_M_invoke<0ul>(std::_Index_tuple<0ul>)
(this=0x1a323e8)
at /usr/include/c++/6.3.1/functional:1390
#15 0x00000000004195f1 in std::_Bind_simple<std::_Mem_fn<void
(imageresizer::engine::FileDownloader::*)()>
(imageresizer::engine::FileDownloader*)>::operator()() (this=0x1a323e8) at
/usr/include/c++/6.3.1/functional:1380
#16 0x00000000004195d0 in
std::thread::_State_impl<std::_Bind_simple<std::_Mem_fn<void
(imageresizer::engine::FileDownloader::*)()>
(imageresizer::engine::FileDownloader*)> >::_M_run() (this=0x1a323e0)
at /usr/include/c++/6.3.1/thread:196
#17 0x00007f58eb02d5cf in ?? () from /lib64/libstdc++.so.6
#18 0x00007f58ea83d5ca in start_thread () from /lib64/libpthread.so.0
#19 0x00007f58ea5770ed in clone () from /lib64/libc.so.6
thread 6 is writing using Google Log (glog) framework.
Other threads are waiting for client downloading requests.
Threads 4-11 are client threads.
Can you help me debug this probl
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