linux-kernel - Re: [syzbot] INFO: rcu detected stall in sys

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Date:   Wed, 20 Apr 2022 14:27:02 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     syzbot <syzbot+306090cfa3294f0bbfb3@...kaller.appspotmail.com>
Cc:     fweisbec@...il.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, mingo@...nel.org,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        viro@...iv.linux.org.uk
Subject: Re: [syzbot] INFO: rcu detected stall in sys_lsetxattr

On Tue, Apr 19, 2022 at 09:16:20AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    40354149f4d7 Add linux-next specific files for 20220414
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=16ae0bd0f00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a44d62051576f6f5
> dashboard link: https://syzkaller.appspot.com/bug?extid=306090cfa3294f0bbfb3
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=164417ccf00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=104d63d0f00000
> 
> The issue was bisected to:
> 
> commit e257039f0fc7da36ac3a522ef9a5cb4ae7852e67
> Author: Al Viro <viro@...iv.linux.org.uk>
> Date:   Tue Mar 1 04:04:20 2022 +0000
> 
>     mount_setattr(): clean the control flow and calling conventions
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14622210f00000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=16622210f00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=12622210f00000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+306090cfa3294f0bbfb3@...kaller.appspotmail.com
> Fixes: e257039f0fc7 ("mount_setattr(): clean the control flow and calling conventions")

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux.git fs.mount_setattr.cleanup