[asterisk-dev] [Code Review] Convert device state callbacks to ao2 objects to fix a deadlock.

[Russell Bryant]

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Ship it!



/branches/1.6.2/main/pbx.c
<https://reviewboard.asterisk.org/r/1072/#comment6367>

    if you just pass NULL as the callback, you'll get the same behavior


- Russell


On 2011-01-18 12:41:53, Jeff Peeler wrote:
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> (Updated 2011-01-18 12:41:53)
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> 
> Review request for Asterisk Developers.
> 
> 
> Summary
> -------
> 
> Lock scenario:
> Thread 1
>  holds ast_rdlock_contexts &conlock
>  holds handle_statechange hints
>  holds handle_statechange hint
>   waiting for cb_extensionstate
>    Locked Here: chan_sip.c line 7428 (find_call)
> Thread 2
>  holds handle_request_do &netlock
>  holds find_call sip_pvt_ptr
>   waiting for ast_rdlock_contexts &conlock
>    Locked Here: pbx.c line 9911 (ast_rdlock_contexts)
> 
> Chan_sip has an established locking order of locking the sip_pvt and then getting the context lock. So the as stated by the summary, the operations in thread 2 have been modified to no longer require the context lock.
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> 
> This addresses bug 18310.
>     https://issues.asterisk.org/view.php?id=18310
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> 
> Diffs
> -----
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>   /branches/1.6.2/main/pbx.c 302171 
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> Diff: https://reviewboard.asterisk.org/r/1072/diff
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> 
> Testing
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> one47 has reported on the issue that it has been going well so far (for 18 hours):
> https://issues.asterisk.org/view.php?id=18310#130297
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> 
> Thanks,
> 
> Jeff
> 
>

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