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https://issues.apache.org/jira/browse/TS-4907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15531446#comment-15531446
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James Peach commented on TS-4907:
---------------------------------
AFAICT it happens with regularity when a transaction hits the slow log
threshold.
> Segfault in 7.0.x on ProxyClientTransaction::get_netvc
> -------------------------------------------------------
>
> Key: TS-4907
> URL: https://issues.apache.org/jira/browse/TS-4907
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Reporter: Mathias Biilmann Christensen
>
> Sending some production traffic to 719dda8af88098cd1f8653aaa52b3d278deff6e1
> produced frequent segfaults with a very short stack trace logged. Example:
> {code}
> traffic_server - STACK TRACE:
> /opt/ts/bin/traffic_server(crash_logger_invoke(int, siginfo_t*,
> void*)+0xc3)[0x510892]
> /lib/x86_64-linux-gnu/libpthread.so.0(+0x10330)[0x2b142107b330]
> {code}
> Here's the longer backtrace from a core dump produced by this segfaul:
> {code}
> #0 0x0000000000000000 in ?? ()
> #1 0x000000000055d79e in ProxyClientTransaction::get_netvc
> (this=0x2aad4c036a68) at http/../ProxyClientTransaction.h:43
> #2 0x00000000005fa97d in HttpSM::update_stats (this=0x2aad4866fa00) at
> HttpSM.cc:6956
> #3 0x00000000005f9d2c in HttpSM::kill_this (this=0x2aad4866fa00) at
> HttpSM.cc:6822
> #4 0x00000000005e9daf in HttpSM::main_handler (this=0x2aad4866fa00,
> event=2301, data=0x2aad48670d08) at HttpSM.cc:2671
> #5 0x00000000005138e2 in Continuation::handleEvent (this=0x2aad4866fa00,
> event=2301, data=0x2aad48670d08) at ../iocore/eventsystem/I_Continuation.h:153
> #6 0x00000000006424c8 in HttpTunnel::main_handler (this=0x2aad48670d08,
> event=103, data=0x2aad1003a490) at HttpTunnel.cc:1662
> #7 0x00000000005138e2 in Continuation::handleEvent (this=0x2aad48670d08,
> event=103, data=0x2aad1003a490) at ../iocore/eventsystem/I_Continuation.h:153
> #8 0x000000000079b459 in write_signal_and_update (event=103,
> vc=0x2aad1003a300) at UnixNetVConnection.cc:179
> #9 0x000000000079b68e in write_signal_done (event=103, nh=0x2aad063eaca0,
> vc=0x2aad1003a300) at UnixNetVConnection.cc:221
> #10 0x000000000079ca6e in write_to_net_io (nh=0x2aad063eaca0,
> vc=0x2aad1003a300, thread=0x2aad063e7010) at UnixNetVConnection.cc:552
> #11 0x000000000079c2e3 in write_to_net (nh=0x2aad063eaca0, vc=0x2aad1003a300,
> thread=0x2aad063e7010) at UnixNetVConnection.cc:419
> #12 0x000000000079321a in NetHandler::mainNetEvent (this=0x2aad063eaca0,
> event=5, e=0x2a88c40) at UnixNet.cc:542
> #13 0x00000000005138e2 in Continuation::handleEvent (this=0x2aad063eaca0,
> event=5, data=0x2a88c40) at ../iocore/eventsystem/I_Continuation.h:153
> #14 0x00000000007beaca in EThread::process_event (this=0x2aad063e7010,
> e=0x2a88c40, calling_code=5) at UnixEThread.cc:146
> #15 0x00000000007bf08e in EThread::execute (this=0x2aad063e7010) at
> UnixEThread.cc:273
> #16 0x00000000007be0cb in spawn_thread_internal (a=0x2a53f50) at Thread.cc:84
> #17 0x00002aad02fcf184 in start_thread (arg=0x2aad06af0700) at
> pthread_create.c:312
> #18 0x00002aad03d0337d in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
> {code}
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