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Date:   Tue, 12 Mar 2019 13:01:54 +0100
From:   Oliver Hartkopp <>
To:     syzbot <>,,,,,,,,,,,,
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

fixes the problem.

Best regards,

On 3/12/19 9:57 AM, syzbot wrote:
> syzbot has bisected this bug to:
> commit ab42f35d9cb5ac49b5a2a11f940e74f58f207280
> Author: Ming Lei <>
> Date:   Fri May 26 11:53:19 2017 +0000
>      blk-mq: merge bio into sw queue before plugging
> bisection log:
> start commit:   ab42f35d blk-mq: merge bio into sw queue before plugging
> git tree:       upstream
> final crash:
> console output:
> kernel config:
> dashboard link: 
> userspace arch: amd64
> syz repro:
> C reproducer:
> Reported-by:
> Fixes: ab42f35d ("blk-mq: merge bio into sw queue before plugging")

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