Re: WARNING in hsr_forward_skb
From: Dmitry Vyukov
Date: Tue Mar 12 2019 - 12:21:39 EST
On Tue, Mar 12, 2019 at 5:09 PM Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote:
> 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
> > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit?id=74b7b490886852582d986a33443c2ffa50970169
> > fixes the problem.
> Hi Oliver,
> You can see how bisection progressed and got to 4.12.0-rc2+ in the
> bisection log.
> 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.
Broken boots did not happen here. "WARNING in hsr_forward_skb" is the
crash that we pursued, so it started correctly. But then diverged to
an unrelated "INFO: trying to register non-static key in
> > 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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