Re: lockdep WARNING for run_timer_softirq()

[Steven Rostedt]

On Wed, 2012-09-05 at 19:09 +0200, Peter Zijlstra wrote:
> On Wed, 2012-09-05 at 10:20 -0400, Steven Rostedt wrote:
> > Well, the branch tracer was active. That means all 'if()'s were being
> > traced. It comes down to how you define 'if' ;-) 
> 
> Yeah, I tried making an argument for:
> 
>   we tell lockdep irqs are enabled hit an if() end up in lockdep code
> through the branch tracer and find borken state, or vice-versa.
> 
> Just couldn't find it in the provided stack-trace. Might be I didn't
> look hard enough, might be there's something else entirely.
> 
> All I know is I've never seen it on real hardware, then again, I hardly
> ever have CONFIG_PARAVIRT or CONFIG_TRACE_BRANCH_PROFILING, let alone
> both.
> 

This looks very familiar to Fengguang's previous bug report. I can't
seem to find it on LKML.org. Probably because of the two attachments
(dmesg and config) caused lkml to nuke it.

I'll forward it to you.

-- Steve


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/