linux-kernel - Re: [syzbot] INFO: task hung in add_early

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Date:   Tue, 7 Jun 2022 06:35:26 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     syzbot <syzbot+5b59d6d459306a556f54@...kaller.appspotmail.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        linux-crypto@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux@...inikbrodowski.net, mpm@...enic.com,
        syzkaller-bugs@...glegroups.com,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, yuehaibing@...wei.com
Subject: Re: [syzbot] INFO: task hung in add_early_randomness (2)

On Tue, Jun 07, 2022 at 05:05:41PM +0800, Jason Wang wrote:
> On Tue, Jun 7, 2022 at 3:30 PM syzbot
> <syzbot+5b59d6d459306a556f54@...kaller.appspotmail.com> wrote:
> >
> > syzbot has bisected this issue to:
> >
> > commit 8b4ec69d7e098a7ddf832e1e7840de53ed474c77
> > Author: Jason Wang <jasowang@...hat.com>
> > Date:   Fri May 27 06:01:19 2022 +0000
> >
> >     virtio: harden vring IRQ
> >
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1175c3c7f00000
> > start commit:   f2906aa86338 Linux 5.19-rc1
> > git tree:       upstream
> > final oops:     https://syzkaller.appspot.com/x/report.txt?x=1375c3c7f00000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=1575c3c7f00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=cbd131cc02ee620e
> > dashboard link: https://syzkaller.appspot.com/bug?extid=5b59d6d459306a556f54
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=104f4d4ff00000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14d6782df00000
> >
> > Reported-by: syzbot+5b59d6d459306a556f54@...kaller.appspotmail.com
> > Fixes: 8b4ec69d7e09 ("virtio: harden vring IRQ")
> >
> > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> >
> 
> I wonder if it's related to shared IRQ.
> 
> Want to know if the attached patch works.
> 
> Thanks


syzbot will test it for you if you ask it nicely.
See e.g.
https://lore.kernel.org/r/20220221054115.1270-1-hdanton%40sina.com

for an example of how to do it.

-- 
MST