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Date:   Tue, 12 Mar 2019 13:01:54 +0100
From:   Oliver Hartkopp <socketcan@...tkopp.net>
To:     syzbot <syzbot+fdce8f2a8903f3ba0e6b@...kaller.appspotmail.com>,
        arvid.brodin@...en.se, axboe@...com, axboe@...nel.dk,
        davem@...emloft.net, hch@....de, linux-block@...r.kernel.org,
        linux-can@...r.kernel.org, linux-kernel@...r.kernel.org,
        ming.lei@...hat.com, mkl@...gutronix.de, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in hsr_forward_skb

Hi all,

I'm not sure why a Kernel 4.12.0-rc2+ is used here, but I do not get any 
problems on the my latest 5.0.0-06622-g1fc1cd8399ab tree and I strongly 
assume this patch showing up in 4.12-rc6

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit?id=74b7b490886852582d986a33443c2ffa50970169

fixes the problem.

Best regards,
Oliver

On 3/12/19 9:57 AM, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit ab42f35d9cb5ac49b5a2a11f940e74f58f207280
> Author: Ming Lei <ming.lei@...hat.com>
> Date:   Fri May 26 11:53:19 2017 +0000
> 
>      blk-mq: merge bio into sw queue before plugging
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16e68713200000
> start commit:   ab42f35d blk-mq: merge bio into sw queue before plugging
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=15e68713200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=11e68713200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=5e7dc790609552d7
> dashboard link: 
> https://syzkaller.appspot.com/bug?extid=fdce8f2a8903f3ba0e6b
> userspace arch: amd64
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15f6d1fd400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17290fdd400000
> 
> Reported-by: syzbot+fdce8f2a8903f3ba0e6b@...kaller.appspotmail.com
> Fixes: ab42f35d ("blk-mq: merge bio into sw queue before plugging")

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