linux-kernel - Re: [syzbot] [bcachefs?] possible deadlock in bch2

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Message-ID: <xu7rlriapup7s5kbss6q3lb45fgrpjt3t7ef7fidj2ggmu54vf@rl5vw6zbbudh>
Date: Sun, 3 Aug 2025 23:27:39 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Al Viro <viro@...iv.linux.org.uk>
Cc: Alan Huang <mmpgouride@...il.com>, 
	syzbot <syzbot+7836a68852a10ec3d790@...kaller.appspotmail.com>, linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com, miklos@...redi.hu, amir73il@...il.com, 
	linux-unionfs@...r.kernel.org
Subject: Re: [syzbot] [bcachefs?] possible deadlock in bch2_symlink

On Mon, Aug 04, 2025 at 04:23:12AM +0100, Al Viro wrote:
> On Mon, Aug 04, 2025 at 11:02:54AM +0800, Alan Huang wrote:
> > +cc overlayfs
> 
> Sigh...
> 
> 2) what the hell is bch2_symlink() need to lock the new inode for?
> page_symlink() doesn't need that; are there any bcachefs-specific reasons
> to bother with that?

No, there isn't. I'll look it over and kill that tomorrow...