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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1400/">https://reviewboard.asterisk.org/r/1400/</a>
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<p>Ship it!</p>
<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Been running all day [17h00 local] accross large variety of sites not one issue today where normally there will be a few 5-10</pre>
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<p>- irroot</p>
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<p>On August 29th, 2011, 6:51 p.m., rmudgett wrote:</p>
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<div>Review request for Asterisk Developers, Alec Davis and irroot.</div>
<div>By rmudgett.</div>
<p style="color: grey;"><i>Updated Aug. 29, 2011, 6:51 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Attempting to pickup a call that has been forked to multiple extensions by two users either crashes or fails a masquerade with a "bad things may happen" message.
This is the scenario that is causing all the grief:
1) Pickup target is selected
2) target is marked as being picked up in ast_do_pickup()
3) target is unlocked by ast_do_pickup()
4) app dial or queue gets a chance to hang up losing calls and calls ast_hangup() on target
5) SINCE A MASQUERADE HAS NOT BEEN SETUP YET BY ast_do_pickup() with ast_channel_masquerade(), ast_hangup() completes successfully and the channel is no longer in the channels container.
6) ast_do_pickup() then calls ast_channel_masquerade() to schedule the masquerade on the dead channel.
7) ast_do_pickup() then calls ast_do_masquerade() on the dead channel
8) bad things happen while doing the masquerade and in the process ast_do_masquerade() puts the dead channel back into the channels container
9) The "orphaned" channel is visible in the channels list if a crash does not happen.
This patch does the following:
1) ast_hangup() sets the zombie flag on a successfully hung-up channel and does not release the channel lock until that has happened.
2) __ast_channel_masquerade() is fixed to not setup a masquerade if either channel is a zombie.
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Replicated the crash in ASTERISK-18222 with PickupChan() and *8 methods.
With the patch, the crash no longer happens and the new message of attempting to masquerade into a dead channel is output.</pre>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-18222">ASTERISK-18222</a>,
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-18273">ASTERISK-18273</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/1.8/main/channel.c <span style="color: grey">(333893)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1400/diff/" style="margin-left: 3em;">View Diff</a></p>
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