linux-kernel - Re: frequent softlockups with 3.10rc6.

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Date:	Wed, 26 Jun 2013 16:00:03 -0400
From:	Dave Jones <davej@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrey Vagin <avagin@...nvz.org>
Subject: Re: frequent softlockups with 3.10rc6.

On Wed, Jun 26, 2013 at 03:52:15PM -0400, Steven Rostedt wrote:

 > >  > Hmm, no it needs a fix to make this work. I applied a patch below that
 > >  > should do this correctly (and will put this into my 3.11 queue).
 > >  > 
 > >  > If you run the test again with this change and with the above filter, it
 > >  > should stop the trace before overwriting the first dump, as it should
 > >  > ignore the printk output.
 > > 
 > > I think something isn't right with this patch.
 > > After 10 hours, I hit the bug again, but...
 > > 
 > > (01:21:28:root@...ary:tracing)# cat trace
 > > # tracer: preemptirqsoff
 > > #
 > > (01:21:30:root@...ary:tracing)# 
 > 
 > Did you apply the patch I added to my last email. It should have prevent
 > that form happening :-/
 
Yeah, that's what I meant by "this patch".
To reduce ambiguity, I mean the one below.. There wasn't another patch
that I missed right ?

	Dave


diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index b19d065..2aefbee 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -373,7 +373,7 @@ start_critical_timing(unsigned long ip, unsigned long parent_ip)
 	struct trace_array_cpu *data;
 	unsigned long flags;
 
-	if (likely(!tracer_enabled))
+	if (!tracer_enabled || !tracing_is_enabled())
 		return;
 
 	cpu = raw_smp_processor_id();
@@ -416,7 +416,7 @@ stop_critical_timing(unsigned long ip, unsigned long parent_ip)
 	else
 		return;
 
-	if (!tracer_enabled)
+	if (!tracer_enabled || !tracing_is_enabled())
 		return;
 
 	data = per_cpu_ptr(tr->trace_buffer.data, cpu);


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