[asterisk-dev] Suspected deadlocks in Asterisk 1.8 under heavy load

[Kevin P. Fleming]

On 08/16/2011 06:42 PM, Alistair Cunningham wrote:
> Just to let everyone know, we strongly suspect that Asterisk 1.8.4.4 and
> 1.8.5.0 suffer from occasional deadlocks under heavy load, possibly
> related to the local channel. The symptoms seem to vary, but include:
>
> 1. Asterisk stops responding to SIP packets, but the Asterisk console
> and manager interface remain responsive. A "sipsak -s sip:127.0.0.1:5060
> -d" times out.

Matt Nicholson committed a change to the 1.8, 10 and trunk branches 
today to solve a significant performance issue caused by the change to 
chan_sip to return the SIP hangup cause to the 'master' channel. His 
change made that behavior optional, even though it was already released 
in 1.8, because of the performance impact it has. We had another 
customer report a similar set of symptoms.

If possible, it would be most helpful if you could try that patch on one 
of your affected systems before you downgrade it. I can understand if 
your customer is not willing to let you try that, though :-)

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at www.digium.com & www.asterisk.org