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

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Message-ID: <CAOQ4uxiPPb70mx0Pr4Ph6hw2j63Q8=PZaxBx3N0KP=d7Ko=1KQ@mail.gmail.com>
Date: Mon, 18 Aug 2025 11:19:43 +0200
From: Amir Goldstein <amir73il@...il.com>
To: Al Viro <viro@...iv.linux.org.uk>
Cc: Alan Huang <mmpgouride@...il.com>, 
	syzbot <syzbot+7836a68852a10ec3d790@...kaller.appspotmail.com>, 
	kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, 
	miklos@...redi.hu, linux-unionfs@...r.kernel.org
Subject: Re: [syzbot] [bcachefs?] possible deadlock in bch2_symlink

On Mon, Aug 4, 2025 at 5:23 AM Al Viro <viro@...iv.linux.org.uk> wrote:
>
> On Mon, Aug 04, 2025 at 11:02:54AM +0800, Alan Huang wrote:
> > +cc overlayfs
>
> Sigh...
>
> 1) ovl_copy_up_workdir() should lock wdir with I_MUTEX_PARENT, same
> as filename_create().

#syz test: https://github.com/amir73il/linux ovl-fixes