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

[Bernard Merindol(F)]

Hi,

I deploy new customer in CallCenter with 20 agents and 1000 call by hour this monday. I have installed Asterisk 1.8.6rc1.

Asterisk hang 6 times this monday wth excatly same symptom  of this thread.

I have downgrade to Asterisk 1.4.42 this day and works fine.

I think Asterisk 1.8.x is not very good for loaded configuration.

In my case the load of computer is not veri high (load 0.5/0.8)  from Linux.

Best regards
Bernard
On 17 août 2011, at 11:03, Tony Mountifield wrote:

> In article <4E4B2634.6090602 at digium.com>,
> Kevin P. Fleming <kpfleming at digium.com> wrote:
>> 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.
> 
> Surely something that just consumes a significant amount of CPU shouldn't
> cause a deadlock directly? A deadlock indicates a logic error. Of course,
> the extra load might make the window longer for a potential deadlock to occur,
> but this might even aid in reproducing it and tracking it down...
> 
> Cheers
> Tony
> -- 
> Tony Mountifield
> Work: tony at softins.co.uk - http://www.softins.co.uk
> Play: tony at mountifield.org - http://tony.mountifield.org
> 
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