linux-kernel - Re: [PATCH] perf powerpc: Don't call perf_event

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Message-ID: <283274720.499126.1475655719491.JavaMail.zimbra@redhat.com>
Date:   Wed, 5 Oct 2016 04:21:59 -0400 (EDT)
From:   Jan Stancek <jstancek@...hat.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Michael Neuling <mikey@...ling.org>,
        Paul Mackerras <paulus@...ba.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: Re: [PATCH] perf powerpc: Don't call perf_event_disable from atomic
 context



----- Original Message -----
> From: "Michael Ellerman" <mpe@...erman.id.au>
> To: "Jiri Olsa" <jolsa@...nel.org>, "Peter Zijlstra" <a.p.zijlstra@...llo.nl>
> Cc: "lkml" <linux-kernel@...r.kernel.org>, "Ingo Molnar" <mingo@...nel.org>, "Michael Neuling" <mikey@...ling.org>,
> "Paul Mackerras" <paulus@...ba.org>, "Alexander Shishkin" <alexander.shishkin@...ux.intel.com>, "Jan Stancek"
> <jstancek@...hat.com>
> Sent: Tuesday, 4 October, 2016 6:08:27 AM
> Subject: Re: [PATCH] perf powerpc: Don't call perf_event_disable from atomic context
> 
> Jiri Olsa <jolsa@...nel.org> writes:
> 
> > The trinity syscall fuzzer triggered following WARN on powerpc:
> >   WARNING: CPU: 9 PID: 2998 at arch/powerpc/kernel/hw_breakpoint.c:278
> >   ...
> >   NIP [c00000000093aedc] .hw_breakpoint_handler+0x28c/0x2b0
> >   LR [c00000000093aed8] .hw_breakpoint_handler+0x288/0x2b0
> >   Call Trace:
> >   [c0000002f7933580] [c00000000093aed8] .hw_breakpoint_handler+0x288/0x2b0
> >   (unreliable)
> >   [c0000002f7933630] [c0000000000f671c] .notifier_call_chain+0x7c/0xf0
> >   [c0000002f79336d0] [c0000000000f6abc]
> >   .__atomic_notifier_call_chain+0xbc/0x1c0
> >   [c0000002f7933780] [c0000000000f6c40] .notify_die+0x70/0xd0
> >   [c0000002f7933820] [c00000000001a74c] .do_break+0x4c/0x100
> >   [c0000002f7933920] [c0000000000089fc] handle_dabr_fault+0x14/0x48
> 
> Is that the full stack trace? It doesn't look like it.
> 
> And were you running trinity as root or regular user?

As regular user:

# adduser dummy
# su dummy /mnt/testarea/trinity --children $proc_num -m --syslog -q -T DIE

Regards,
Jan