Re: perf: fuzzer, lots of warnings

[Vince Weaver]

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.GJ18673@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

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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