linux-kernel - Re: [syzbot] [mm?] INFO: task hung in write_cache

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Message-ID: <ZACjNSxGlVX6l39S@casper.infradead.org>
Date:   Thu, 2 Mar 2023 13:23:01 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     syzbot <syzbot+0adf31ecbba886ab504f@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, davem@...emloft.net, dvyukov@...gle.com,
        edumazet@...gle.com, elver@...gle.com, glider@...gle.com,
        hdanton@...a.com, kasan-dev@...glegroups.com, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] INFO: task hung in write_cache_pages (2)

On Thu, Mar 02, 2023 at 04:06:28AM -0800, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 17bb55487988c5dac32d55a4f085e52f875f98cc
> Author: Matthew Wilcox (Oracle) <willy@...radead.org>
> Date:   Tue May 17 22:12:25 2022 +0000
> 
>     ntfs: Remove check for PageError

Syzbot has bisected to the wrong commit.  That code (a) isn't going
to be executed by this test, since it doesn't have an ntfs image and
(b) was dead.  Never could have been executed.

> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13fd6e54c80000
> start commit:   489fa31ea873 Merge branch 'work.misc' of git://git.kernel...
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=10036e54c80000
> console output: https://syzkaller.appspot.com/x/log.txt?x=17fd6e54c80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=cbfa7a73c540248d
> dashboard link: https://syzkaller.appspot.com/bug?extid=0adf31ecbba886ab504f
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16dc6960c80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16f39d50c80000
> 
> Reported-by: syzbot+0adf31ecbba886ab504f@...kaller.appspotmail.com
> Fixes: 17bb55487988 ("ntfs: Remove check for PageError")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection