linux-kernel - Re: [PATCH 5.4 0/5] CIFS DFS fixes for 5.4

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Date:   Sat, 24 Jun 2023 16:10:24 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Paulo Alcantara <pc@...guebit.com>
Cc:     Rishabh Bhatnagar <risbhat@...zon.com>, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-cifs@...r.kernel.org
Subject: Re: [PATCH 5.4 0/5] CIFS DFS fixes for 5.4

On Fri, Jun 23, 2023 at 07:08:22PM -0300, Paulo Alcantara wrote:
> Rishabh Bhatnagar <risbhat@...zon.com> writes:
> 
> > We are seeing deadlock in cifs code while updating volume in
> > cifs_reconnect. There are few fixes available in stable trees
> > already. This series backports some patches back to 5.4 stable.
> >
> >  __schedule+0x268/0x6e0
> >  schedule+0x2f/0xa0
> >  schedule_preempt_disabled+0xa/0x10
> >  __mutex_lock.isra.7+0x20b/0x470
> >  ? dfs_cache_update_vol+0x45/0x2a0 [cifs]
> >  dfs_cache_update_vol+0x45/0x2a0 [cifs]
> >  cifs_reconnect+0x6f2/0xef0 [cifs]
> >  cifs_handle_standard+0x18d/0x1b0 [cifs]
> >  cifs_demultiplex_thread+0xa5c/0xc90 [cifs]
> >  ? cifs_handle_standard+0x1b0/0x1b0 [cifs]
> >
> > Paulo Alcantara (SUSE) (5):
> >   cifs: Clean up DFS referral cache
> >   cifs: Get rid of kstrdup_const()'d paths
> >   cifs: Introduce helpers for finding TCP connection
> >   cifs: Merge is_path_valid() into get_normalized_path()
> >   cifs: Fix potential deadlock when updating vol in cifs_reconnect()
> >
> >  fs/cifs/dfs_cache.c | 701 +++++++++++++++++++++++---------------------
> >  1 file changed, 372 insertions(+), 329 deletions(-)
> 
> Looks good, thanks.

All now queued up, thanks.

greg k-h