linux-kernel - Re: INFO: rcu detected stall in __perf_sw

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Message-ID: <CACT4Y+Ya21HPJVEcsGRgZLK+F+Q5kV-fEp3O755GC9WWB_D=DA@mail.gmail.com>
Date:   Thu, 28 Mar 2019 09:21:33 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Finn Thain <fthain@...egraphics.com.au>
Cc:     syzbot <syzbot+a41ac89a0712acde0e84@...kaller.appspotmail.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        funaho@...ai.org, Geert Uytterhoeven <geert@...ux-m68k.org>,
        jolsa@...hat.com, LKML <linux-kernel@...r.kernel.org>,
        linux-m68k@...ts.linux-m68k.org, Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: INFO: rcu detected stall in __perf_sw_event

On Wed, Mar 27, 2019 at 12:28 AM Finn Thain <fthain@...egraphics.com.au> wrote:
>
> On Tue, 26 Mar 2019, syzbot wrote:
>
> > syzbot has bisected this bug to:
> >
> > commit cf85d89562f39cc7ae73de54639f1915a9195b7a
> > Author: Finn Thain <fthain@...egraphics.com.au>
> > Date:   Fri May 25 07:34:36 2018 +0000
> >
> >    m68k/mac: Enable PDMA for PowerBook 500 series
> >
>
> Looks like a false positive. But if you really are running syzkaller on a
> PowerBook 500, you'll want to check that you have an FPU, otherwise a CPU
> erratum will probably mess up your results.

Agree. I've included it into the big bisection analysis as "hard to
reproduce" case:
https://lkml.org/lkml/2019/3/27/788


> --
>
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1226cb8b200000
> > start commit:   b0314565 Merge tag 'for_linus' of git://git.kernel.org/pub..
> > git tree:       upstream
> > final crash:    https://syzkaller.appspot.com/x/report.txt?x=1126cb8b200000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=1626cb8b200000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=8f00801d7b7c4fe6
> > dashboard link: https://syzkaller.appspot.com/bug?extid=a41ac89a0712acde0e84
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1707cd2f400000
> >
> > Reported-by: syzbot+a41ac89a0712acde0e84@...kaller.appspotmail.com
> > Fixes: cf85d89562f3 ("m68k/mac: Enable PDMA for PowerBook 500 series")
> >
> > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
> --
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