GitHub user hopkings2008 opened a pull request:
https://github.com/apache/trafficserver/pull/147
TS-3196: Core dump when handle event check_inactivity
From the core dump, if we use ssl and spdy, so in the function
'ProtocolProbeTrampoline::ioCompletionEvent', it will first disable the
read io
adn handover the continuation of read.vio._cont from
'ProtocolProbeTrampoline'
to 'SpdyClientSession' by below two steps:
1. first disable current io by using 'netvc->do_io_read(this, 0, NULL)'.
2. change the read.vio._cont by using
'probeParent->endpoint[key]>accept(netvc, this>iobuf, reader);' which will
be
'SpdySessionAccept::accept' in our case. and in the end, it will call
'SpdyClientSession::state_session_start' which will call
'this->vc->do_io_read'
to set read.vio._cont to SpdyClientSession.
the main point is that the function 'SpdySessionAccept::accept' function
will
put an SpdyClientSession event into eventProcessor for net
'eventProcessor.schedule_imm(sm, ET_NET);'
and because each 'net' thread will put a check_inactivity event into the
queue
So, in the end, between 'netvc->do_io_read(this, 0, NULL)' and
spdy handler is set, the
check_inactivity may be executed, and if so, the crash will occur.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yahoo/trafficserver TS-3196
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/trafficserver/pull/147.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 #147
----
commit e943879c5961a18aa9146d32c805ae80a3a5d894
Author: zouyu <z...@yahoo-inc.com>
Date: 2014-11-14T06:23:43Z
TS-3196: Core dump when handle event check_inactivity
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