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Posted to issues@trafficserver.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2014/03/25 00:04:44 UTC
[jira] [Commented] (TS-2497) Failed post results in tunnel buffers
being returned to freelist prematurely
[ https://issues.apache.org/jira/browse/TS-2497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13945835#comment-13945835 ]
ASF GitHub Bot commented on TS-2497:
------------------------------------
GitHub user jacksontj opened a pull request:
https://github.com/apache/trafficserver/pull/66
Change default to keep_alive_post_out
Keepalive post out used to cause issues, but we have since found and fixed the root cause (TS-2497) and we are now running this on in production. This entire feature should be cleaned out-- since it was created to workaround this problem that is now fixed.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jacksontj/trafficserver master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/trafficserver/pull/66.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #66
----
commit e210eb0a35452215c3da9cd32ff916128c73f80f
Author: Thomas Jackson <ja...@gmail.com>
Date: 2014-03-24T23:01:21Z
Keepalive post out used to cause issues, but we have since found and fixed the root cause (TS-2497) and we are now running this on in production. This entire feature should be cleaned out-- since it was created to workaround this problem that is now fixed.
----
> 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: 4.1.3, 4.2.0
>
>
> 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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