linux-kernel - Re: asterisk hangs with RT priority

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Date:	Wed, 24 Dec 2008 19:12:25 +0530
From:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Patrick McHardy <kaber@...sh.net>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Balbir Singh <balbir@...ibm.com>
Subject: Re: asterisk hangs with RT priority

On Wed, Dec 24, 2008 at 10:36:17PM +1100, Herbert Xu wrote:
> On Sun, May 18, 2008 at 06:10:03PM +0200, Patrick McHardy wrote:
> > I'm seeing hanging asterisk processes on startup when using
> > RT priority with current -git. Unfortunately I'm not sure about
> > the last working version, but it was one of the final 2.6.25 rcs.
> > The hang stops when executing "schedtool -N $(pidof asterisk)".
> 
> I'm now hitting exactly the same problem with 2.6.28-rc9 (I had
> it with 2.6.27 too but thought it might go away on its own :)
> 
> I've made a small program to attempt to reproduce this based on
> the asterisk code.  Unfortunately it doesn't work on its own.
> However, if you run it under strace then it does hang in the
> same away as asterisk (which seems to happen after the setuid
> call, as strace shows it before hanging and the printk after
> it in asterisk gets executed).
> 
> Note that the hang goes away if either setscheduler or setuid
> is removed.
> 

Hmm. Do you have CONFIG_FAIR_USER_SCHED set on?

Thanks,
-- 
regards,
Dhaval
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