Re: [tip:perf/core] perf: Fix PERF_EVENT_IOC_PERIOD migration race
From: Peter Zijlstra
Date: Wed Aug 12 2015 - 13:07:32 EST
On Wed, Aug 12, 2015 at 09:49:40AM -0400, Vince Weaver wrote:
> On Wed, 12 Aug 2015, tip-bot for Peter Zijlstra wrote:
> > Commit-ID: c7999c6f3fed9e383d3131474588f282ae6d56b9
> > Gitweb: http://git.kernel.org/tip/c7999c6f3fed9e383d3131474588f282ae6d56b9
> > Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> > AuthorDate: Tue, 4 Aug 2015 19:22:49 +0200
> > Committer: Ingo Molnar <mingo@xxxxxxxxxx>
> > CommitDate: Wed, 12 Aug 2015 11:37:22 +0200
> > perf: Fix PERF_EVENT_IOC_PERIOD migration race
> > I ran the perf fuzzer, which triggered some WARN()s which are due to
> > trying to stop/restart an event on the wrong CPU.
> Do you have a list of which WARNs this should fix? Just so I can
> update my bug tracker.
I think this triggered:
if (WARN_ON_ONCE(i == cpuc->n_events)) /* called ->del() without ->add() ? */
I didn't safe a copy of the exact backtrace.
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