Can you provide a minimal reproducible case? -Pieter
On Wed, May 22, 2013 at 12:32 AM, Stephen Hemminger < [email protected]> wrote: > We have a ZMQ based application (in C) using CZMQ and ZMQ 2.2.0 > When daemon is due to be restarted or shutdown > 1. it receives a SIGTERM > 2. The signal is caught, and flag is set > 3. all the worker threads exit > 4. main thread waits for workers and does some other cleanup > 5. calls zctx_destroy() > and hangs there; any clues? maybe the zctx_destroy() is redundant anyway. > > > int > main(int argc, char **argv) > { > ... > > zctx_destroy(&zmq_ctx); << hang here > > return 0; > } > > There were several ZMQ sockets created, instrumenting CZMQ, it looks > like ZMQ is hanging in zctx__socket_destroy() of the ZMQ_REQ socket > which was bound twice, once to an ipc: endpoint and again to a > tcp://lo:5910 > endpoint. > > Internally it looks like ZMQ reaper isn't working. > > The back trace of main thread is: > [Switching to thread 1 (Thread 0x7f1267625c80 (LWP 2065))]#0 > 0x00007f126626ec13 in poll () from /lib/libc.so.6 > (gdb) where > #0 0x00007f126626ec13 in poll () from /lib/libc.so.6 > #1 0x00007f1266bd5df0 in zmq::signaler_t::wait (this=<value optimized > out>, > timeout_=-1) at signaler.cpp:145 > #2 0x00007f1266bc6aae in zmq::mailbox_t::recv (this=0x1b4c808, > cmd_=0x7fff010baee0, timeout_=-1) at mailbox.cpp:74 > #3 0x00007f1266bc059d in zmq::ctx_t::terminate (this=0x1b4c770) at > ctx.cpp:146 > #4 0x00007f1266be100c in zmq_term (ctx_=0x1b4c770) at zmq.cpp:292 > #5 0x00007f1266df8efe in zctx_destroy (self_p=0x7107a0) at zctx.c:122 > #6 0x000000000040ae53 in main (argc=<value optimized out>, > > Some other threads: > (gdb) thread 4 > [Switching to thread 4 (Thread 0x7f1241bf9700 (LWP 2149))]#0 > 0x00007f126627a163 in epoll_wait () from /lib/libc.so.6 > (gdb) where > #0 0x00007f126627a163 in epoll_wait () from /lib/libc.so.6 > #1 0x00007f1266bc3a90 in zmq::epoll_t::loop (this=0x1b4e680) at > epoll.cpp:142 > #2 0x00007f1266bdbdeb in thread_routine (arg_=0x1b4e6f0) at thread.cpp:75 > #3 0x00007f12665128ca in start_thread () from /lib/libpthread.so.0 > #4 0x00007f1266279b6d in clone () from /lib/libc.so.6 > #5 0x0000000000000000 in ?? () > (gdb) thread 5 > [Switching to thread 5 (Thread 0x7f12423fa700 (LWP 2148))]#0 > 0x00007f126627a163 in epoll_wait () from /lib/libc.so.6 > (gdb) where > #0 0x00007f126627a163 in epoll_wait () from /lib/libc.so.6 > #1 0x00007f1266bc3a90 in zmq::epoll_t::loop (this=0x1b4d050) at > epoll.cpp:142 > #2 0x00007f1266bdbdeb in thread_routine (arg_=0x1b4d0c0) at thread.cpp:75 > #3 0x00007f12665128ca in start_thread () from /lib/libpthread.so.0 > #4 0x00007f1266279b6d in clone () from /lib/libc.so.6 > #5 0x0000000000000000 in ?? () > (gdb) thread 6 > [Switching to thread 6 (Thread 0x7f1242bfb700 (LWP 2102))]#0 > 0x00007f126651a14d in read () from /lib/libpthread.so.0 > (gdb) where > #0 0x00007f126651a14d in read () from /lib/libpthread.so.0 > #1 0x00000000004c6938 in eal_thread_loop () > #2 0x00007f12665128ca in start_thread () from /lib/libpthread.so.0 > #3 0x00007f1266279b6d in clone () from /lib/libc.so.6 > #4 0x0000000000000000 in ?? () > (gdb) thread 7 > [Switching to thread 7 (Thread 0x7f12433fc700 (LWP 2101))]#0 > 0x00007f126651a14d in read () from /lib/libpthread.so.0 > (gdb) where > #0 0x00007f126651a14d in read () from /lib/libpthread.so.0 > #1 0x00000000004c6938 in eal_thread_loop () > #2 0x00007f12665128ca in start_thread () from /lib/libpthread.so.0 > #3 0x00007f1266279b6d in clone () from /lib/libc.so.6 > #4 0x0000000000000000 in ?? () > (gdb) thread 8 > [Switching to thread 8 (Thread 0x7f1243bfd700 (LWP 2100))]#0 > 0x00007f126651a14d in read () from /lib/libpthread.so.0 > (gdb) where > #0 0x00007f126651a14d in read () from /lib/libpthread.so.0 > #1 0x00000000004c6938 in eal_thread_loop () > #2 0x00007f12665128ca in start_thread () from /lib/libpthread.so.0 > #3 0x00007f1266279b6d in clone () from /lib/libc.so.6 > #4 0x0000000000000000 in ?? () > _______________________________________________ > zeromq-dev mailing list > [email protected] > http://lists.zeromq.org/mailman/listinfo/zeromq-dev >
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