Hi, Try setting linger to 0 just before.
Kind regards, Stathis ----- Original Message ----- From: Stephen Hemminger [mailto:[email protected]] Sent: Wednesday, May 22, 2013 12:32 AM To: [email protected] <[email protected]> Subject: [zeromq-dev] zctx_destroy is hanging 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 _______________________________________________ zeromq-dev mailing list [email protected] http://lists.zeromq.org/mailman/listinfo/zeromq-dev
