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https://issues.apache.org/jira/browse/TS-2497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14306135#comment-14306135
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Brian Geffon commented on TS-2497:
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[~shinrich], honestly it was so long ago I really don't remember. I believe it
only reproduced for us under highload in production.
> Failed post results in tunnel buffers being returned to freelist prematurely
> ----------------------------------------------------------------------------
>
> Key: TS-2497
> URL: https://issues.apache.org/jira/browse/TS-2497
> Project: Traffic Server
> Issue Type: Bug
> Components: Core
> Reporter: Brian Geffon
> Assignee: Brian Geffon
> Fix For: 4.2.0
>
> Attachments: TS-2497.patch, client.js, origin-server.js, repro.js
>
>
> When a post fails to an origin server either the server died or the server
> returned a response without reading all of the post data, in either case, TS
> will destroy buffers too early. This normally does not result in a crash
> because the MIOBuffers are returned to the freelist and only with sufficient
> load will the race happen causing a crash. Additionally, even if a crash
> doesn't happen you might have data corruption across post requests from the
> buffers being used after being returned to the freelist.
> Thanks to Thomas Jackson for help reproducing and resolving this bug.
> An example stack trace, while we've seen other crashes in write_avail too.
> #0 0x00000000004eff14 in IOBufferBlock::read_avail (this=0x0) at
> ../iocore/eventsystem/I_IOBuffer.h:362
> #1 0x000000000050d151 in MIOBuffer::append_block_internal
> (this=0x2aab38001130, b=0x2aab0c037200) at
> ../iocore/eventsystem/P_IOBuffer.h:946
> #2 0x000000000050d39b in MIOBuffer::append_block (this=0x2aab38001130,
> asize_index=15) at ../iocore/eventsystem/P_IOBuffer.h:986
> #3 0x000000000050d49b in MIOBuffer::add_block (this=0x2aab38001130) at
> ../iocore/eventsystem/P_IOBuffer.h:994
> #4 0x000000000055cee2 in MIOBuffer::check_add_block (this=0x2aab38001130) at
> ../iocore/eventsystem/P_IOBuffer.h:1002
> #5 0x000000000055d115 in MIOBuffer::write_avail (this=0x2aab38001130) at
> ../iocore/eventsystem/P_IOBuffer.h:1048
> #6 0x00000000006c18f3 in read_from_net (nh=0x2aaafca0d208,
> vc=0x2aab1c009140, thread=0x2aaafca0a010) at UnixNetVConnection.cc:234
> #7 0x00000000006c37bf in UnixNetVConnection::net_read_io
> (this=0x2aab1c009140, nh=0x2aaafca0d208, lthread=0x2aaafca0a010) at
> UnixNetVConnection.cc:816
> #8 0x00000000006be392 in NetHandler::mainNetEvent (this=0x2aaafca0d208,
> event=5, e=0x271d8e0) at UnixNet.cc:380
> #9 0x00000000004f05c4 in Continuation::handleEvent (this=0x2aaafca0d208,
> event=5, data=0x271d8e0) at ../iocore/eventsystem/I_Continuation.h:146
> #10 0x00000000006e361e in EThread::process_event (this=0x2aaafca0a010,
> e=0x271d8e0, calling_code=5) at UnixEThread.cc:142
> #11 0x00000000006e3b13 in EThread::execute (this=0x2aaafca0a010) at
> UnixEThread.cc:264
> #12 0x00000000006e290b in spawn_thread_internal (a=0x2716400) at Thread.cc:88
> #13 0x0000003372c077e1 in start_thread () from /lib64/libpthread.so.0
> #14 0x00000033728e68ed in clone () from /lib64/libc.so.6
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