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Subject: Re: [ANNOUNCE] 3.0-rt6
From: Peter Zijlstra <peterz@infradead.org>
To: Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>
Cc: Thomas Gleixner <tglx@linutronix.de>, LKML <linux-kernel@vger.kernel.org>,
        linux-rt-users <linux-rt-users@vger.kernel.org>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
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Date: Thu, 04 Aug 2011 11:42:45 +0200
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On Wed, 2011-08-03 at 23:34 -0700, Fernando Lopez-Lezcano wrote:
> [  117.026009]  [<ffffffff814ef322>] _raw_spin_lock+0x45/0x79
> [  117.026009]  [<ffffffff8107b6f1>] ? __run_posix_cpu_timers+0x8f/0x353
> [  117.026009]  [<ffffffff8107b6f1>] __run_posix_cpu_timers+0x8f/0x353 

I think its this one, could you confirm?

---
Index: linux-2.6/kernel/posix-cpu-timers.c
===================================================================
--- linux-2.6.orig/kernel/posix-cpu-timers.c
+++ linux-2.6/kernel/posix-cpu-timers.c
@@ -1288,10 +1288,11 @@ static inline int fastpath_timer_check(s
 	sig = tsk->signal;
 	if (sig->cputimer.running) {
 		struct task_cputime group_sample;
+		unsigned long flags;
 
-		raw_spin_lock(&sig->cputimer.lock);
+		raw_spin_lock_irqsave(&sig->cputimer.lock, flags);
 		group_sample = sig->cputimer.cputime;
-		raw_spin_unlock(&sig->cputimer.lock);
+		raw_spin_unlock_irqrestore(&sig->cputimer.lock, flags);
 
 		if (task_cputime_expired(&group_sample, &sig->cputime_expires))
 			return 1;