linux-kernel - Re: possible deadlock in perf_trace

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Message-ID: <20180421171225.GA1098@sol.localdomain>
Date:   Sat, 21 Apr 2018 10:12:25 -0700
From:   Eric Biggers <ebiggers3@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        syzbot 
        <syzbot+c9695f0404c72c8f0b7abbac660d986af9008fc5@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>, syzkaller-bugs@...glegroups.com
Subject: Re: possible deadlock in perf_trace_destroy (2)

On Tue, Jan 23, 2018 at 08:37:49AM +0100, 'Dmitry Vyukov' via syzkaller-bugs wrote:
> On Tue, Jan 23, 2018 at 12:19 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> > On Mon, Jan 22, 2018 at 05:20:13PM -0500, Steven Rostedt wrote:
> >>
> >> Peter,
> >>
> >> Isn't this the same as what you mentioned (and had a hack patch for)
> >> before?
> >>
> >>  http://lkml.kernel.org/r/20180109133651.GB2369@hirez.programming.kicks-ass.net
> >>
> >
> > Looks like it. Just haven't managed to get those patches merged. I'll
> > try and get that sorted tomorrow. Thanks for the reminder.
> 

No longer occurring, fix was commit 82d94856fa22:

#syz fix: perf/core: Fix lock inversion between perf,trace,cpuhp

- Eric