From: Borislav Petkov <bp@alien8.de>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: syzbot <syzbot+111bc509cd9740d7e4aa@syzkaller.appspotmail.com>,
Dou Liyang <douly.fnst@cn.fujitsu.com>,
"H. Peter Anvin" <hpa@zytor.com>,
konrad.wilk@oracle.com, Len Brown <len.brown@intel.com>,
LKML <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>,
puwen@hygon.cn, syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
Thomas Gleixner <tglx@linutronix.de>,
wang.yi59@zte.com.cn, the arch/x86 maintainers <x86@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: WARNING in rcu_check_gp_start_stall
Date: Sat, 23 Feb 2019 11:38:09 +0100 [thread overview]
Message-ID: <20190223103809.GB23376@zn.tnic> (raw)
In-Reply-To: <CACT4Y+aq+5Hor2f-SsaO4VW3p1Xq2Xk-2OUeKhpp=aOx0XMmzg@mail.gmail.com>
On Sat, Feb 23, 2019 at 11:33:33AM +0100, Dmitry Vyukov wrote:
> On Fri, Feb 22, 2019 at 11:20 PM Borislav Petkov <bp@alien8.de> wrote:
> >
> > On Fri, Feb 22, 2019 at 09:10:04AM -0800, syzbot wrote:
> > > Hello,
> > >
> > > syzbot found the following crash on:
> > >
> > > HEAD commit: 8a61716ff2ab Merge tag 'ceph-for-5.0-rc8' of git://github...
> > > git tree: upstream
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=1531dd3f400000
> > > kernel config: https://syzkaller.appspot.com/x/.config?x=7132344728e7ec3f
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=111bc509cd9740d7e4aa
> > > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d4966cc00000
> > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10c492d0c00000
> >
> > So I ran this for more than an hour in a guest here with the above
> > .config but nothing happened. The compiler I used is 8.2, dunno of that
> > makes the difference or I'm missing something else...
>
> I was able to reproduce this on the first run:
>
> # ./syz-execprog -procs=8 -repeat=0 hang
Ok, this is what I'm missing: I ran the reproducer directly but you run
a multithreaded thing with this syz-execprog. Where do I get that syz-
thing?
> There is a bunch of other bug reports about hangs where reproducers
> mention perf_event_open and sched_setattr.
This is a known issue, says peterz.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
next prev parent reply other threads:[~2019-02-23 10:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-22 17:10 syzbot
2019-02-22 22:20 ` Borislav Petkov
2019-02-23 10:33 ` Dmitry Vyukov
2019-02-23 10:38 ` Borislav Petkov [this message]
2019-02-23 10:50 ` Dmitry Vyukov
2019-02-23 10:56 ` Borislav Petkov
2019-03-17 10:43 ` syzbot
2019-03-17 11:04 ` Greg KH
2019-03-18 12:18 ` Dmitry Vyukov
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