linux-kernel - Re: INFO: task hung in do_read_cache

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Message-ID: <c8f94666-3e55-2421-78c6-c2cdd0f24d16@redhat.com>
Date:   Mon, 11 May 2020 12:31:20 -0500
From:   Mike Christie <mchristi@...hat.com>
To:     syzbot <syzbot+518c54e255b5031adde4@...kaller.appspotmail.com>,
        akpm@...ux-foundation.org, amir73il@...il.com, axboe@...nel.dk,
        darrick.wong@...cle.com, jack@...e.cz, josef@...icpanda.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        syzkaller-bugs@...glegroups.com, william.kucharski@...cle.com,
        willy@...radead.org
Subject: Re: INFO: task hung in do_read_cache_page (3)

On 5/11/20 8:19 AM, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 2da22da573481cc4837e246d0eee4d518b3f715e
> Author: Mike Christie <mchristi@...hat.com>
> Date:   Tue Aug 13 16:39:52 2019 +0000
> 
>     nbd: fix zero cmd timeout handling v2
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11d6ab14100000
> start commit:   e99332e7 gcc-10: mark more functions __init to avoid secti..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=13d6ab14100000
> console output: https://syzkaller.appspot.com/x/log.txt?x=15d6ab14100000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8a96cf498e199d8b
> dashboard link: https://syzkaller.appspot.com/bug?extid=518c54e255b5031adde4
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=146e45ec100000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=164444a4100000
> 
> Reported-by: syzbot+518c54e255b5031adde4@...kaller.appspotmail.com
> Fixes: 2da22da57348 ("nbd: fix zero cmd timeout handling v2")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> 

How do you adjust/modify what is expected from the test or what is
reported as an error?

The patch added back behavior that got removed. With the patch we expect
the hung task warnings, because we specifically want to hold onto
running commands for longer than 120/hung_task_timeout seconds