Messages in this thread | | | Date | Fri, 05 Jul 2013 09:41:13 -0700 | From | "H. Peter Anvin" <> | Subject | Re: Yet more softlockups. |
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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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