linux-kernel - Re: [syzbot] [input?] INFO: task hung in uhid_char

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Message-ID: <9a8ca460-3d36-92cf-ccf4-7ecf1a654f06@linux.ibm.com>
Date:   Tue, 29 Aug 2023 14:56:14 -0400
From:   Matthew Rosato <mjrosato@...ux.ibm.com>
To:     syzbot <syzbot+8fe2d362af0e1cba8735@...kaller.appspotmail.com>,
        agordeev@...ux.ibm.com, akrowiak@...ux.ibm.com,
        benjamin.tissoires@...hat.com, clg@...hat.com, davem@...emloft.net,
        david.rheinsberg@...il.com, edumazet@...gle.com, jikos@...nel.org,
        kuba@...nel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [input?] INFO: task hung in uhid_char_release

On 8/29/23 1:28 PM, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit bf48961f6f48e3b7eb80c3e179207e9f4e4cd660
> Author: Tony Krowiak <akrowiak@...ux.ibm.com>
> Date:   Tue May 30 22:35:37 2023 +0000
> 
>     s390/vfio-ap: realize the VFIO_DEVICE_SET_IRQS ioctl

Hmm, this doesn't seem like the right commit.  The changes for bf48961f6f48e3b7eb80c3e179207e9f4e4cd660 are limited to the vfio_ap module, which requires CONFIG_S390 and CONFIG_VFIO_AP.  Besides the config referenced below I also looked at other cases via the dashboard link and none of the config files I checked had either of these.

Thanks,
Matt

> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=155eba2fa80000
> start commit:   bde7f150276b Merge tag 'pm-6.5-rc2' of git://git.kernel.or..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=175eba2fa80000
> console output: https://syzkaller.appspot.com/x/log.txt?x=135eba2fa80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=6d0f369ef5fb88c9
> dashboard link: https://syzkaller.appspot.com/bug?extid=8fe2d362af0e1cba8735
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=124711b6a80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=178c5a92a80000
> 
> Reported-by: syzbot+8fe2d362af0e1cba8735@...kaller.appspotmail.com
> Fixes: bf48961f6f48 ("s390/vfio-ap: realize the VFIO_DEVICE_SET_IRQS ioctl")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection