Re: [syzbot] [bcachefs?] possible deadlock in bch2_symlink

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Subject: Re: [syzbot] [bcachefs?] possible deadlock in bch2_symlink
From: Amir Goldstein <amir73il@xxxxxxxxx>
Date: Mon, 18 Aug 2025 11:19:43 +0200
Cc: Alan Huang <mmpgouride@xxxxxxxxx>, syzbot <syzbot+7836a68852a10ec3d790@xxxxxxxxxxxxxxxxxxxxxxxxx>, kent.overstreet@xxxxxxxxx, linux-bcachefs@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, syzkaller-bugs@xxxxxxxxxxxxxxxx, miklos@xxxxxxxxxx, linux-unionfs@xxxxxxxxxxxxxxx
In-reply-to: <20250804032312.GX222315@ZenIV>

On Mon, Aug 4, 2025 at 5:23 AM Al Viro <viro@xxxxxxxxxxxxxxxxxx> 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

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- Re: [syzbot] [bcachefs?] possible deadlock in bch2_symlink
  - From: Alan Huang
- Re: [syzbot] [bcachefs?] possible deadlock in bch2_symlink
  - From: Al Viro

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