On Thu, 2 Jul 2015, Peter Zijlstra wrote:
> On Thu, Jul 02, 2015 at 11:42:43AM -0400, Vince Weaver wrote:
> > (#4)
> >
> > [ 1638.702578] WARNING: CPU: 2 PID: 25543 at
> > arch/x86/kernel/cpu/perf_event_intel_lbr.c:349
> > intel_pmu_lbr_disable+0xbc/0xd0()
> >
> > WARN_ON_ONCE(cpuc->lbr_users < 0);
> >
> > [ 1638.857921] [<ffffffff8102e56c>] intel_pmu_lbr_disable+0xbc/0xd0
> > [ 1638.864874] [<ffffffff81031812>] intel_pmu_disable_event+0xc2/0x130
> > [ 1638.872125] [<ffffffff81030a49>] ? __intel_pmu_disable_all+0x49/0x70
> > [ 1638.879455] [<ffffffff81029175>] x86_pmu_stop+0x75/0xd0
> > [ 1638.885560] [<ffffffff81159f1a>] perf_ioctl+0x40a/0x470
> > [ 1638.891650] [<ffffffff811f199a>] do_vfs_ioctl+0x2ba/0x4a0
> > [ 1638.897945] [<ffffffff811dd9ac>] ? vfs_read+0x11c/0x130
> > [ 1638.904069] [<ffffffff811f27bd>] ? poll_select_set_timeout+0x4d/0x70
> > [ 1638.911417] [<ffffffff811f1bf9>] SyS_ioctl+0x79/0x90
> > [ 1638.917295] [<ffffffff816a64b2>] entry_SYSCALL_64_fastpath+0x16/0x7a
>
> This might maybe help:
>
> http://lkml.kernel.org/r/20150624144750.gj18...@twins.programming.kicks-ass.net
ah, OK, I missed that one somehow. It would also explain the
[ 3971.156004] Uhhuh. NMI received for unknown reason 21 on CPU 2.
[ 3971.162812] Do you have a strange power saving mode enabled?
[ 3971.169363] Dazed and confused, but trying to continue
messages I am getting.
I'm also still getting a lot of
perfevents: irq loop stuck!
messages, I thought the workaround for that had gone in for 4.2 but I
guess not.
Vince
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