[pjsip] Deadlock In Media State Handler

Colin Morelli colin.morelli at gmail.com
Fri Apr 22 22:17:06 EDT 2016

Sorry for blowing up the email list here.

It appears I was having some hardware issues. After struggling to resolve
some other issues on my machine, things seem to be working correctly now.
However, this raises an interesting concern around how PJSIP handles this
particular failure case. It seems that in the event coreaudio_dev.c can't
start the core audio stream, it hangs indefinitely. This ultimately results
in PJSIP deadlocking (and, thus, the resulting application crashes).

I'll see if there's anything I can figure out in the source to put a patch
together, but I'm very new to all of this.


On Fri, Apr 22, 2016 at 9:43 PM Colin Morelli <colin.morelli at gmail.com>

> Also, if it's helpful (and relevant), this is the content of my handler
> method:
> http://pastebin.com/raw/bBXJEvjd
> I've done the equivalent in PJSUA too (not using PJSUA2) and get the same
> results. The code in that paste is executed on the same thread as the code
> that initializes the PJSUA2 endpoint.
> I'm running out of ideas.
> Best,
> Colin
> On Fri, Apr 22, 2016 at 7:43 PM Colin Morelli <colin.morelli at gmail.com>
> wrote:
>> Hey all,
>> Possibly I'm missing something stupid here (probably), but I'm getting a
>> deadlock with PJSIP 2.4.5 in the iPhone Simulator (x86_64) on iOS 9.3. My
>> process is this:
>> Init PJSIP on main thread
>> Register account via TCP
>> Receive incoming call
>> "Answer" call with 180 ringing, prompt the user to answer the call
>> When user taps "answer" (again, main thread), send 200 OK and connect the
>> conference ports
>> Here are the logs:
>> http://pastebin.com/raw/ZJysmY9R
>> Interestingly this was working earlier today, and I haven't really
>> changed anything. But, it is failing consistently now. Has anyone else seen
>> this?
>> Thanks in advance.
>> Best,
>> Colin
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