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SubjectRe: BUG: unable to handle kernel paging request in dqput
On Sun 27-09-20 09:07:02, Takashi Iwai wrote:
> On Sat, 26 Sep 2020 22:48:15 +0200,
> syzbot wrote:
> >
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit: 98477740 Merge branch 'rcu/urgent' of git://git.kernel.org..
> > git tree: upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=17930875900000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=af502ec9a451c9fc
> > dashboard link: https://syzkaller.appspot.com/bug?extid=f816042a7ae2225f25ba
> > compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=133783ab900000
> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13bb5973900000
> >
> > The issue was bisected to:
> >
> > commit 1d0f953086f090a022f2c0e1448300c15372db46
> > Author: Ioan-Adrian Ratiu <adi@adirat.com>
> > Date: Wed Jan 4 22:37:46 2017 +0000
> >
> > ALSA: usb-audio: Fix irq/process data synchronization
> >
> > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=133362c3900000
> > final oops: https://syzkaller.appspot.com/x/report.txt?x=10b362c3900000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=173362c3900000
>
> This commit looks really irrelevant from the Oops code path.
> It must be a different reason.

Yeah, it seems the bisection got confused because it hit a different error
during the bisection. Looking at the original oops, I think the actual
reason of a crash is that quota file got corrupted in a particular way.
Quota code is not very paranoid when checking on disk contents. I'll work
on adding more sanity checks to quota code...

Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR

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