swebb2066 commented on PR #287: URL: https://github.com/apache/logging-log4cxx/pull/287#issuecomment-1806610085
For the record, using multithreadtest with XMLSocketAppender and no server listening on the TCP port, the deadlock is: `(gdb) thread apply all bt Thread 5 (Thread 0x7f45027fc640 (LWP 7473) "multithreadtest"): #0 __futex_abstimed_wait_common64 (private=128, cancel=true, abstime=0x0, op=265, expected=7467, futex_word=0x7f4509a1b910) at ./nptl/futex-internal.c:57 #1 __futex_abstimed_wait_common (cancel=true, private=128, abstime=0x0, clockid=0, expected=7467, futex_word=0x7f4509a1b910) at ./nptl/futex-internal.c:87 #2 __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f4509a1b910, expected=7467, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=128) at ./nptl/futex-internal.c:139 #3 0x00007f450a1b7624 in __pthread_clockjoin_ex (threadid=139934491063872, thread_return=0x0, clockid=0, abstime=0x0, block=<optimised out>) at ./nptl/pthread_join_common.c:105 #4 0x00007f450a4452c7 in std::thread::join() () from /lib/x86_64-linux-gnu/libstdc++.so.6 #5 0x00007f450a7c8259 in log4cxx::net::SocketAppenderSkeleton::close() () from /home/stephen/build/logging-log4cxx/src/main/cpp/liblog4cxx.so.15 #6 0x00007f450a6efa91 in log4cxx::helpers::AppenderAttachableImpl::removeAllAppenders() () from /home/stephen/build/logging-log4cxx/src/main/cpp/liblog4cxx.so.15 #7 0x00007f450a739ca4 in log4cxx::Hierarchy::~Hierarchy() () from /home/stephen/build/logging-log4cxx/src/main/cpp/liblog4cxx.so.15 #8 0x00007f450a73eada in std::_Sp_counted_ptr<log4cxx::Hierarchy*, (__gnu_cxx::_Lock_policy)2>::_M_dispose() () from /home/stephen/build/logging-log4cxx/src/main/cpp/liblog4cxx.so.15 #9 0x00007f450a714765 in log4cxx::spi::DefaultRepositorySelector::~DefaultRepositorySelector() () from /home/stephen/build/logging-log4cxx/src/main/cpp/liblog4cxx.so.15 #10 0x00007f450a6f488a in log4cxx::helpers::APRInitializer::~APRInitializer() () from /home/stephen/build/logging-log4cxx/src/main/cpp/liblog4cxx.so.15 #11 0x00007f450a166495 in __run_exit_handlers (status=0, listp=0x7f450a33a838 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true) at ./stdlib/exit.c:113 #12 0x00007f450a166610 in __GI_exit (status=<optimised out>) at ./stdlib/exit.c:143 #13 0x00007f450a1baee8 in __pthread_once_slow (once_control=0x557d5586a070 <multithread_logger(int)::exiting>, init_routine=0x7f450a443d50 <__once_proxy>) at ./nptl/pthread_once.c:116 #14 0x0000557d5585ea0b in multithread_logger(int) () #15 0x00007f450a445253 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6 #16 0x00007f450a1b5ac3 in start_thread (arg=<optimised out>) at ./nptl/pthread_create.c:442 #17 0x00007f450a247a40 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81 Thread 4 (Thread 0x7f45037fe640 (LWP 7471) "multithreadtest"): #0 futex_wait (private=0, expected=1, futex_word=0x557d5586a070 <multithread_logger(int)::exiting>) at ../sysdeps/nptl/futex-internal.h:146 #1 futex_wait_simple (private=0, expected=1, futex_word=0x557d5586a070 <multithread_logger(int)::exiting>) at ../sysdeps/nptl/futex-internal.h:177 #2 __pthread_once_slow (once_control=0x557d5586a070 <multithread_logger(int)::exiting>, init_routine=0x7f450a443d50 <__once_proxy>) at ./nptl/pthread_once.c:105 #3 0x0000557d5585ea0b in multithread_logger(int) () #4 0x00007f450a445253 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6 #5 0x00007f450a1b5ac3 in start_thread (arg=<optimised out>) at ./nptl/pthread_create.c:442 #6 0x00007f450a247a40 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81 Thread 3 (Thread 0x7f450921a640 (LWP 7468) "multithreadtest"): #0 futex_wait (private=0, expected=1, futex_word=0x557d5586a070 <multithread_logger(int)::exiting>) at ../sysdeps/nptl/futex-internal.h:146 #1 futex_wait_simple (private=0, expected=1, futex_word=0x557d5586a070 <multithread_logger(int)::exiting>) at ../sysdeps/nptl/futex-internal.h:177 #2 __pthread_once_slow (once_control=0x557d5586a070 <multithread_logger(int)::exiting>, init_routine=0x7f450a443d50 <__once_proxy>) at ./nptl/pthread_once.c:105 #3 0x0000557d5585ea0b in multithread_logger(int) () #4 0x00007f450a445253 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6 #5 0x00007f450a1b5ac3 in start_thread (arg=<optimised out>) at ./nptl/pthread_create.c:442 #6 0x00007f450a247a40 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81 Thread 2 (Thread 0x7f4509a1b640 (LWP 7467) "multithreadtest"): #0 futex_wait (private=0, expected=2, futex_word=0x557d5629c948) at ../sysdeps/nptl/futex-internal.h:146 #1 __GI___lll_lock_wait (futex=futex@entry=0x557d5629c948, private=0) at ./nptl/lowlevellock.c:49 #2 0x00007f450a1b9002 in lll_mutex_lock_optimized (mutex=0x557d5629c948) at ./nptl/pthread_mutex_lock.c:48 #3 ___pthread_mutex_lock (mutex=0x557d5629c948) at ./nptl/pthread_mutex_lock.c:93 #4 0x00007f450a762c30 in log4cxx::helpers::LogLog::debug(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) () from /home/stephen/build/logging-log4cxx/src/main/cpp/liblog4cxx.so.15 #5 0x00007f450a7ca62e in log4cxx::net::SocketAppenderSkeleton::monitor() () from /home/stephen/build/logging-log4cxx/src/main/cpp/liblog4cxx.so.15 #6 0x00007f450a445253 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6 #7 0x00007f450a1b5ac3 in start_thread (arg=<optimised out>) at ./nptl/pthread_create.c:442 #8 0x00007f450a247a40 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81 Thread 1 (Thread 0x7f4509f91b80 (LWP 7466) "multithreadtest"): #0 __futex_abstimed_wait_common64 (private=128, cancel=true, abstime=0x0, op=265, expected=7468, futex_word=0x7f450921a910) at ./nptl/futex-internal.c:57 #1 __futex_abstimed_wait_common (cancel=true, private=128, abstime=0x0, clockid=0, expected=7468, futex_word=0x7f450921a910) at ./nptl/futex-internal.c:87 #2 __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f450921a910, expected=7468, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=128) at ./nptl/futex-internal.c:139 #3 0x00007f450a1b7624 in __pthread_clockjoin_ex (threadid=139934482671168, thread_return=0x0, clockid=0, abstime=0x0, block=<optimised out>) at ./nptl/pthread_join_common.c:105 #4 0x00007f450a4452c7 in std::thread::join() () from /lib/x86_64-linux-gnu/libstdc++.so.6 #5 0x0000557d5585e237 in MultithreadTest::testMultithreadedLoggers() () --Type <RET> for more, q to quit, c to continue without paging--c #6 0x0000557d5585dd42 in void LogUnit::runTest<MultithreadTest>(abts_case*, void (MultithreadTest::*)()) () #7 0x0000557d55860630 in abts_run_test(abts_suite*, char const*, void (*)(abts_case*, void*), void*) () #8 0x0000557d55861c31 in abts_run_suites(abts_suite*) () #9 0x0000557d5585cbd0 in main () (gdb) ` -- This is an automated message from the Apache Git Service. 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