* Re: [tip:perf/core] perf: Fix PERF_EVENT_IOC_PERIOD migration race [not found] <tip-c7999c6f3fed9e383d3131474588f282ae6d56b9@git.kernel.org> @ 2015-08-12 13:49 ` Vince Weaver 2015-08-12 17:07 ` Peter Zijlstra 0 siblings, 1 reply; 2+ messages in thread From: Vince Weaver @ 2015-08-12 13:49 UTC (permalink / raw) To: mingo, tglx, linux-kernel, hpa, torvalds, peterz; +Cc: linux-tip-commits 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@infradead.org> > AuthorDate: Tue, 4 Aug 2015 19:22:49 +0200 > Committer: Ingo Molnar <mingo@kernel.org> > 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. Thanks, Vince ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [tip:perf/core] perf: Fix PERF_EVENT_IOC_PERIOD migration race 2015-08-12 13:49 ` [tip:perf/core] perf: Fix PERF_EVENT_IOC_PERIOD migration race Vince Weaver @ 2015-08-12 17:07 ` Peter Zijlstra 0 siblings, 0 replies; 2+ messages in thread From: Peter Zijlstra @ 2015-08-12 17:07 UTC (permalink / raw) To: Vince Weaver; +Cc: mingo, tglx, linux-kernel, hpa, torvalds, linux-tip-commits 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@infradead.org> > > AuthorDate: Tue, 4 Aug 2015 19:22:49 +0200 > > Committer: Ingo Molnar <mingo@kernel.org> > > 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: arch/x86/kernel/cpu/perf_event.c:x86_pmu_del() if (WARN_ON_ONCE(i == cpuc->n_events)) /* called ->del() without ->add() ? */ Through perf_ioctl()->perf_event_period(). I didn't safe a copy of the exact backtrace. ^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <tip-c7999c6f3fed9e383d3131474588f282ae6d56b9@git.kernel.org>
2015-08-12 13:49 ` [tip:perf/core] perf: Fix PERF_EVENT_IOC_PERIOD migration race Vince Weaver
2015-08-12 17:07 ` Peter Zijlstra
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