Re: WARNING in hsr_forward_skb

On Tue, Mar 12, 2019 at 5:09 PM Dmitry Vyukov [off-list ref] wrote:

On Tue, Mar 12, 2019 at 1:02 PM Oliver Hartkopp [off-list ref] wrote:

quoted

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:
https://github.com/google/syzkaller/issues/1051
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
can_notifier".

quoted

On 3/12/19 9:57 AM, syzbot wrote:

quoted

syzbot has bisected this bug to:

commit ab42f35d9cb5ac49b5a2a11f940e74f58f207280
Author: Ming Lei [off-list ref]
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@syzkaller.appspotmail.com
Fixes: ab42f35d ("blk-mq: merge bio into sw queue before plugging")

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