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

[Jeff Peeler]

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This is an automatically generated e-mail. To reply, visit:
https://reviewboard.asterisk.org/r/1072/
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Review request for Asterisk Developers.


Summary
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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.


This addresses bug 18310.
    https://issues.asterisk.org/view.php?id=18310


Diffs
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  /branches/1.6.2/main/pbx.c 301088 

Diff: https://reviewboard.asterisk.org/r/1072/diff


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


Thanks,

Jeff

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