Re: WARNING in geneve_exit_batch_net (2)

Re: WARNING in geneve_exit_batch_net (2)

[syzbot]

syzbot has bisected this bug to:

commit 4e645b47c4f000a503b9c90163ad905786b9bc1d
Author: Florian Westphal <fw@strlen.de>
Date:   Thu Nov 30 23:21:02 2017 +0000

    netfilter: core: make nf_unregister_net_hooks simple wrapper again

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1594fbfde00000
start commit:   63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=1794fbfde00000
console output: https://syzkaller.appspot.com/x/log.txt?x=1394fbfde00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9833e26bab355358
dashboard link: https://syzkaller.appspot.com/bug?extid=68a8ed58e3d17c700de5
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14f08165e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17902329e00000

Reported-by: syzbot+68a8ed58e3d17c700de5@syzkaller.appspotmail.com
Fixes: 4e645b47c4f0 ("netfilter: core: make nf_unregister_net_hooks simple wrapper again")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Re: WARNING in geneve_exit_batch_net (2)

[Florian Westphal]

syzbot <syzbot+68a8ed58e3d17c700de5@syzkaller.appspotmail.com> wrote:
> syzbot has bisected this bug to:
> 
> commit 4e645b47c4f000a503b9c90163ad905786b9bc1d
> Author: Florian Westphal <fw@strlen.de>
> Date:   Thu Nov 30 23:21:02 2017 +0000
> 
>     netfilter: core: make nf_unregister_net_hooks simple wrapper again

No idea why this turns up, the reproducer doesn't hit any of these code
paths.

The debug splat is a false-positive; ndo_stop/list_del hasn't run yet.
I will send a fix for net tree.

Re: WARNING in geneve_exit_batch_net (2)

[Dmitry Vyukov]

On Fri, Mar 13, 2020 at 2:45 AM Florian Westphal <fw@strlen.de> wrote:
>
> syzbot <syzbot+68a8ed58e3d17c700de5@syzkaller.appspotmail.com> wrote:
> > syzbot has bisected this bug to:
> >
> > commit 4e645b47c4f000a503b9c90163ad905786b9bc1d
> > Author: Florian Westphal <fw@strlen.de>
> > Date:   Thu Nov 30 23:21:02 2017 +0000
> >
> >     netfilter: core: make nf_unregister_net_hooks simple wrapper again
>
> No idea why this turns up, the reproducer doesn't hit any of these code
> paths.

The attached bisection log usually makes this reasonably transparent.
It seems that in this case another kernel bug gets in the way of bisection.

> The debug splat is a false-positive; ndo_stop/list_del hasn't run yet.
> I will send a fix for net tree.
>
> --
> You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/20200313014435.GY979%40breakpoint.cc.