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SubjectRe: Yet more softlockups.
On 07/05/2013 09:02 AM, Thomas Gleixner wrote:
> On Fri, 5 Jul 2013, Dave Jones wrote:
>> On Fri, Jul 05, 2013 at 05:15:07PM +0200, Thomas Gleixner wrote:
>> > On Fri, 5 Jul 2013, Dave Jones wrote:
>> >
>> > > BUG: soft lockup - CPU#3 stuck for 23s! [trinity-child1:14565]
>> > > perf samples too long (2519 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
>> > > INFO: NMI handler (perf_event_nmi_handler) took too long to run: 238147.002 msecs
>> >
>> > So we see a softlockup of 23 seconds and the perf_event_nmi_handler
>> > claims it did run 23.8 seconds.
>> >
>> > Are there more instances of NMI handler messages ?
>>
>> [ 2552.006181] perf samples too long (2511 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
>> [ 2552.008680] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 500392.002 msecs
>
> Yuck. Spending 50 seconds in NMI context surely explains a softlockup :)
>

Hmmm... this makes me wonder if the interrupt tracepoint stuff is at
fault here, as it changes the IDT handling for NMI context.

-hpa



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