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Date: Thu, 2 Jul 2015 18:47:02 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Stephane Eranian <eranian@gmail.com>
Subject: Re: perf: fuzzer, lots of warnings
Message-ID: <20150702164702.GA19282@twins.programming.kicks-ass.net>
References: <alpine.DEB.2.20.1507021134030.14637@vincent-weaver-1.umelst.maine.edu>
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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@twins.programming.kicks-ass.net
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