linux-ext4 - Re: [syzbot] [ext4?] INFO: task hung in __writeback_inodes_sb

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Date:   Sat, 19 Aug 2023 00:50:04 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     syzbot <syzbot+38d04642cea49f3a3d2e@...kaller.appspotmail.com>
CC:     <adilger.kernel@...ger.ca>, <linkinjeon@...nel.org>,
        <linux-ext4@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_pkondeti@...cinc.com>,
        <rafael.j.wysocki@...el.com>, <sj1557.seo@...sung.com>,
        <syzkaller-bugs@...glegroups.com>, <tytso@....edu>,
        <wendy.wang@...el.com>
Subject: Re: [syzbot] [ext4?] INFO: task hung in __writeback_inodes_sb_nr (6)

Hi,

On 2023-08-18 at 06:10:41 -0700, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 5904de0d735bbb3b4afe9375c5b4f9748f882945
> Author: Chen Yu <yu.c.chen@...el.com>
> Date:   Fri Apr 14 12:10:42 2023 +0000
> 
>     PM: hibernate: Do not get block device exclusively in test_resume mode
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1275be4ba80000
> start commit:   4853c74bd7ab Merge tag 'parisc-for-6.5-rc7' of git://git.k..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=1175be4ba80000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1675be4ba80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=aa796b6080b04102
> dashboard link: https://syzkaller.appspot.com/bug?extid=38d04642cea49f3a3d2e
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=171242cfa80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17934703a80000
> 
> Reported-by: syzbot+38d04642cea49f3a3d2e@...kaller.appspotmail.com
> Fixes: 5904de0d735b ("PM: hibernate: Do not get block device exclusively in test_resume mode")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Thanks for reporting this, the commit has set the exclusive open mode incorrectly
for non-snapshot_test mode, I'll post a fix patch.

thanks,
Chenyu