linux-kernel - Re: WARNING in rcu_check_gp_start

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Message-ID: <20190222222036.GC30766@zn.tnic>
Date:   Fri, 22 Feb 2019 23:20:36 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     syzbot <syzbot+111bc509cd9740d7e4aa@...kaller.appspotmail.com>
Cc:     douly.fnst@...fujitsu.com, hpa@...or.com, konrad.wilk@...cle.com,
        len.brown@...el.com, linux-kernel@...r.kernel.org,
        mingo@...hat.com, puwen@...on.cn, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, wang.yi59@....com.cn, x86@...nel.org
Subject: Re: WARNING in rcu_check_gp_start_stall

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...

-- 
Regards/Gruss,
    Boris.

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