linux-kernel - Re: [syzbot] [overlayfs?] possible deadlock in ovl_nlink

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Message-ID: <20240421002129.GF2118490@ZenIV>
Date: Sun, 21 Apr 2024 01:21:29 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: syzbot <syzbot+5ad5425056304cbce654@...kaller.appspotmail.com>
Cc: amir73il@...il.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-unionfs@...r.kernel.org,
	miklos@...redi.hu, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [overlayfs?] possible deadlock in ovl_nlink_start

On Thu, Apr 18, 2024 at 10:37:18PM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=106c9fa3180000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4d90a36f0cab495a
> dashboard link: https://syzkaller.appspot.com/bug?extid=5ad5425056304cbce654
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/72ab73815344/disk-fe46a7dd.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/2d6d6b0d7071/vmlinux-fe46a7dd.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/48e275e5478b/bzImage-fe46a7dd.xz

Should be fixed in mainline since 72374d71c315