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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1658/">https://reviewboard.asterisk.org/r/1658/</a>
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<p style="margin-top: 0;">On January 8th, 2012, 6:49 a.m., <b>wdoekes</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I think this is the fix to a symptom instead of a problem.
Bear with me for a minute.
(1) The bug we're referring to (A18883) talks about problems with 10 vs. 1.8. This bug you're fixing is present in 1.8 as well.
(2) While you're fixing a potential crash, you're instead making the graceful stop less graceful when called twice.
(3) I found a problem with db_sync in main/db.c which causes problems with and without this patch.
--1--
Logically, you wouldn't expect a fix for a bug that *is* present in 1.8 to fix a different bug that is *only* present in 10.
--2--
Now, I do agree that there is a bug if you can get asterisk to crash like you're doing with your tests.
However: what you're doing here is this:
THREAD 1: calls quit_handler
THREAD 1: calls atexits
THREAD 1: hangs for whatever reason
THREAD 2: calls quit_handler
THREAD 2: skips atexists
THREAD 2: kills asterisk
When the hanging is due to a problem (as I think is seen in (3)), the problem should be fixed, not the symptom.
When the hanging is not a hang, but simply a slow operation, a second quit_handler call will suddently skip the clean shutdown mechanisms and kill asterisk.
This could be simply an impatient user calling TERM on asterisk twice. This second TERM should IMHO be *ignored*, *not* *sped* *up* by skipping cleanups.
I haven't looked at all the ways that quit_handler can be called, but I'm thinking *that* function could use an early return instead of the run_atexists function.
--3--
I've tracked a problem down with doexit handling in main/db.c. This is code in 10 that doesn't exist in 1.8.
Review is here: https://reviewboard.asterisk.org/r/1659
--Conclusion--
I can't give this the ship-it because of my concerns about (2). But there is indeed a bug because the atexits should be called twice. However, the quit_handler shouldn't be called twice either.</pre>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">s/should/shouldn't/</pre>
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<p>- wdoekes</p>
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<p>On January 7th, 2012, 3:42 p.m., Terry Wilson wrote:</p>
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<div>Review request for Asterisk Developers, wdoekes and Matt Jordan.</div>
<div>By Terry Wilson.</div>
<p style="color: grey;"><i>Updated Jan. 7, 2012, 3:42 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;">Asterisk can get multiple calls to the quit_handler from different threads. This can result in the atexit functions running multiple times. In one case, this causes multiple calls to the xmlCleanupParser() function which causes a double free and crash. I initially tried to handle things in quit_handler, but only succeeded in making some consoles never exit. :-)</pre>
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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;">Threw tons of asterisk -rx "core stop gracefully" calls in a loop at a bunch of 'asterisk -vvvgc' instances that were also starting in loops until it crashed. After the patch, it stopped crashing.</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-18883">ASTERISK-18883</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/asterisk.c <span style="color: grey">(349967)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1658/diff/" style="margin-left: 3em;">View Diff</a></p>
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