[asterisk-bugs] [JIRA] (ASTERISK-24516) Asterisk segfaults when playing back voicemail under high concurrency with an IMAP backend

[David Duncan Ross Palmer (JIRA)]

David Duncan Ross Palmer created ASTERISK-24516:
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             Summary: Asterisk segfaults when playing back voicemail under high concurrency with an IMAP backend
                 Key: ASTERISK-24516
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-24516
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Applications/app_voicemail/IMAP
    Affects Versions: 11.8.1
         Environment: Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.60-1+deb7u3 x86_64 GNU/Linux
Debian version 7.6
            Reporter: David Duncan Ross Palmer


We have managed to reliably reproduce a crash when playing back voicemail from a specific mailbox, when using the IMAP_STORAGE backend, via libc-client2007e.
The actual IMAP implementation is an in house product, and likely beyond the scope of the problem

	▪	STEPS TO REPRODUCE ******
1. Build Asterisk to use IMAP_STORAGE
2. Create a voicemailbox in voicemail.conf.
3. Create a peer within sip.conf to allow sipp to have unauthenticated access to dial the mailbox
4. Set up a dialplan so that you can call “VoicemailMain <extension>,sa(1)” that is, to play an old message automagically.
5. Run the following SIPp command:

{code}
sipp -sn uac -d 7000 -s ‘*1’ 127.0.0.1 -l 400 -mp 5606
{code}

ie. dial to listen to your voicemail, using the aforementioned dialplan with 400 concurrent calls, each 7 secs max duration.  It will be a mere matter of a minute or so until the condition is triggered, in our experience.
	▪	ADDITIONAL INFORMATION ******
The following files are attached;
TODO.diff

The idea of TODO.diff being that some operations that mail_open does may not be thread safe, so just implement a global mutex around it in Asterisk.



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