From: Peter Zijlstra <peterz@infradead.org>
To: Sasha Levin <sasha.levin@oracle.com>
Cc: paulus@samba.org, Ingo Molnar <mingo@kernel.org>,
acme@ghostprotocols.net, LKML <linux-kernel@vger.kernel.org>,
Dave Jones <davej@redhat.com>
Subject: Re: perf: NULL ptr deref in perf_event_context_sched_in
Date: Wed, 10 Sep 2014 12:02:57 +0200 [thread overview]
Message-ID: <20140910100257.GP16043@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <540F53C9.6040800@oracle.com>
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On Tue, Sep 09, 2014 at 03:23:53PM -0400, Sasha Levin wrote:
> While fuzzing with trinity inside a KVM tools guest running the latest -next
> kernel, I've stumbled on the following spew:
>
> [ 1181.492212] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040
> [ 1181.500717] IP: perf_event_context_sched_in (kernel/events/core.c:333 kernel/events/core.c:2575)
Oh joy:
static inline struct perf_cpu_context *
__get_cpu_context(struct perf_event_context *ctx)
{
return this_cpu_ptr(ctx->pmu->pmu_cpu_context);
}
For some reason our pmu::pmu_cpu_context per-cpu storage is gone. Now
how did that happen.... /me puzzled
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prev parent reply other threads:[~2014-09-10 10:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-09 19:23 perf: NULL ptr deref in perf_event_context_sched_in Sasha Levin
2014-09-10 10:02 ` Peter Zijlstra [this message]
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