Re: WARNING in hsr_forward_skb
From: Dmitry Vyukov
Date: Tue Mar 12 2019 - 12:09:52 EST
On Tue, Mar 12, 2019 at 1:02 PM Oliver Hartkopp <socketcan@xxxxxxxxxxxx> wrote:
> 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.
You can see how bisection progressed and got to 4.12.0-rc2+ in the
The commit that it come up with looks unrelated.
I've started collecting such cases at:
and added for this case:
Bisected to wrong commit.
Root cause: broken kernel boots, bugs that happen on all tests.
Boot is broken for several releases with "WARNING in hsr_forward_skb",
this switches to a bug that happens during every test "INFO: trying to
register non-static key in can_notifier", which then leads to a
completely random commit.
> On 3/12/19 9:57 AM, syzbot wrote:
> > syzbot has bisected this bug to:
> > commit ab42f35d9cb5ac49b5a2a11f940e74f58f207280
> > Author: Ming Lei <ming.lei@xxxxxxxxxx>
> > 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@xxxxxxxxxxxxxxxxxxxxxxxxx
> > Fixes: ab42f35d ("blk-mq: merge bio into sw queue before plugging")
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