[asterisk-bugs] [JIRA] Created: (ASTERISK-20437) Deadlock with ast_context_remove_extension_callerid and handle_request_do

[Jeff Hutchins (JIRA)]

Deadlock with ast_context_remove_extension_callerid and handle_request_do
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                 Key: ASTERISK-20437
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20437
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/Subscriptions
    Affects Versions: 1.8.9.3
            Reporter: Jeff Hutchins
         Attachments: backtrace.full.txt, backtrace.txt

As can be seen in the attached backtrace files thread 25 obtains a sip_pvt lock (0x2aaabc46b658) at chan_sip.c:25270 (#9 in thread 25) with a call to sip_pvt_lock_full and then later in the stack trace (#5 in thread 25) tries to acquire a context lock at pbx.c:4302 with a call to ast_rdlock_context. At the same time thread 2 obtains a context lock at pbx.c:5580 (#12 in thread 2) with a call to find_context_locked(context) which in turn calls ast_rdlock_context and then later in it's stack trace thread 2 attempts to obtain a sip_pvt lock (0x2aaabc46b658) at chan_sip.c:14485 (#5 in thread 2) with a call to sip_pvt_lock_full. This naturally causes a deadlock as each thread holds the resource the other is trying to acquire. 

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