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SubjectRe: WARNING in rcu_check_gp_start_stall
On Sun, Mar 17, 2019 at 12:04 PM Greg KH <gregkh@linuxfoundation.org> wrote:
>
> On Sun, Mar 17, 2019 at 03:43:01AM -0700, syzbot wrote:
> > syzbot has bisected this bug to:
> >
> > commit f1e3e92135202ff3d95195393ee62808c109208c
> > Author: Malcolm Priestley <tvboxspy@gmail.com>
> > Date: Wed Jul 22 18:16:42 2015 +0000
> >
> > staging: vt6655: fix tagSRxDesc -> next_desc type
> >
> > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=111856cf200000
> > start commit: f1e3e921 staging: vt6655: fix tagSRxDesc -> next_desc type
> > git tree: upstream
> > final crash: https://syzkaller.appspot.com/x/report.txt?x=131856cf200000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=151856cf200000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=7132344728e7ec3f
> > dashboard link: https://syzkaller.appspot.com/bug?extid=111bc509cd9740d7e4aa
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d4966cc00000
> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10c492d0c00000
> >
> > Reported-by: syzbot+111bc509cd9740d7e4aa@syzkaller.appspotmail.com
> > Fixes: f1e3e921 ("staging: vt6655: fix tagSRxDesc -> next_desc type")
>
> I think syzbot is a bit confused here, how can this simple patch, where
> you do not have the hardware for this driver, cause this problem?

Yes, I guess so.
This perf_event_open+sched_setattr combo bug causes problems with
hangs at random places, developers looking at these hangs again and
again, incorrect bisection. I would be useful if somebody
knowledgeable in perf/sched look at it.

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