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When dns_session_release() calls dns_session_free(), it was shown that it might still be attached there: Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00000000006437d7 in dns_session_free (ds=0x7f895439e810) at src/dns.c:768 768 BUG_ON(!LIST_ISEMPTY(&ds->ring.waiters)); [Current thread is 1 (Thread 0x7f895bbe2700 (LWP 31792))] (gdb) bt #0 0x00000000006437d7 in dns_session_free (ds=0x7f895439e810) at src/dns.c:768 #1 0x0000000000643ab8 in dns_session_release (appctx=0x7f89545a4ff0) at src/dns.c:805 #2 0x000000000062e35a in si_applet_release (si=0x7f89545a5550) at include/haproxy/stream_interface.h:236 #3 0x000000000063150f in stream_int_shutw_applet (si=0x7f89545a5550) at src/stream_interface.c:1697 #4 0x0000000000640ab8 in si_shutw (si=0x7f89545a5550) at include/haproxy/stream_interface.h:437 #5 0x0000000000643103 in dns_session_io_handler (appctx=0x7f89545a4ff0) at src/dns.c:725 #6 0x00000000006d776f in task_run_applet (t=0x7f89545a5100, context=0x7f89545a4ff0, state=81924) at src/applet.c:90 #7 0x000000000068b82b in run_tasks_from_lists (budgets=0x7f895bbbf5c0) at src/task.c:611 #8 0x000000000068c258 in process_runnable_tasks () at src/task.c:850 #9 0x0000000000621e61 in run_poll_loop () at src/haproxy.c:2636 #10 0x0000000000622328 in run_thread_poll_loop (data=0x8d7440 <ha_thread_info+64>) at src/haproxy.c:2807 #11 0x00007f895c54a06b in start_thread () from /lib64/libpthread.so.0 #12 0x00007f895bf3772f in clone () from /lib64/libc.so.6 (gdb) p &ds->ring.waiters $1 = (struct list *) 0x7f895439e8a8 (gdb) p ds->ring.waiters $2 = { n = 0x7f89545a5078, p = 0x7f89545a5078 } (gdb) p ds->ring.waiters->n $3 = (struct list *) 0x7f89545a5078 (gdb) p *ds->ring.waiters->n $4 = { n = 0x7f895439e8a8, p = 0x7f895439e8a8 } Let's always detach it before freeing so that it remains possible to check the dns_session's ring before releasing it, and possibly catch bugs.
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)