Willy Tarreau f5b4e064dc MEDIUM: debug: add support for dumping backtraces of stuck threads ...

When a panic() occurs due to a stuck thread, we'll try to dump a
backtrace of this thread if the config directive USE_BACKTRACE is
set (which is the case on linux+glibc). For this we use the
backtrace() call provided by glibc and iterate the pointers through
resolve_sym_name(). In order to minimize the output (which is limited
to one buffer), we only do this for stuck threads, and we start the
dump above ha_panic()/ha_thread_dump_all_to_trash(), and stop when
meeting known points such as main/run_tasks_from_list/run_poll_loop.

If enabled without USE_DL, the dump will be complete with no details
except that pointers will all be given relative to main, which is
still better than nothing.

The new USE_BACKTRACE config option is enabled by default on glibc since
it has been present for ages. When it is set, the export-dynamic linker
option is enabled so that all non-static symbols are properly resolved.

2020-03-03 18:40:03 +01:00

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51d.c

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acl.c

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action.c

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activity.c

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applet.c

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arg.c

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auth.c

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backend.c

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base64.c

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buffer.c

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cache.c

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calltrace.c

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cfgparse-global.c

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cfgparse-listen.c

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cfgparse.c

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channel.c

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checks.c

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chunk.c

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cli.c

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compression.c

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connection.c

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da.c

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debug.c

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dict.c

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dns.c

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ev_epoll.c

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ev_evports.c

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ev_kqueue.c

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ev_poll.c

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ev_select.c

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fcgi-app.c

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fcgi.c

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fd.c

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filters.c

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flt_http_comp.c

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flt_spoe.c

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flt_trace.c

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freq_ctr.c

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frontend.c

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h1_htx.c

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h1.c

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h2.c

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haproxy.c

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hash.c

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hathreads.c

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hlua_fcn.c

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hlua.c

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hpack-dec.c

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hpack-enc.c

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hpack-huff.c

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hpack-tbl.c

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http_acl.c

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http_act.c

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http_ana.c

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http_conv.c

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http_fetch.c

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http_htx.c

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http_rules.c

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http.c

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htx.c

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i386-linux-vsys.c

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lb_chash.c

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lb_fas.c

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lb_fwlc.c

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lb_fwrr.c

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lb_map.c

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listener.c

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log.c

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lru.c

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mailers.c

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map.c

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memory.c

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mux_fcgi.c

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mux_h1.c

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mux_h2.c

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mux_pt.c

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mworker-prog.c

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mworker.c

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namespace.c

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pattern.c

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payload.c

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peers.c

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pipe.c

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proto_sockpair.c

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proto_tcp.c

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proto_udp.c

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proto_uxst.c

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protocol.c

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proxy.c

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queue.c

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raw_sock.c

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regex.c

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ring.c

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sample.c

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server.c

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session.c

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sha1.c

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shctx.c

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signal.c

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sink.c

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ssl_sock.c

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standard.c

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stats.c

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stick_table.c

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stream_interface.c

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stream.c

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task.c

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tcp_rules.c

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time.c

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trace.c

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uri_auth.c

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vars.c

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version.c

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wdt.c

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wurfl.c

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xprt_handshake.c

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xxhash.c

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