linux-kernel - Re: Buggy rwsem locking code in fs/smb/client/file.c

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Message-ID: <20230703182859.GO4253@hirez.programming.kicks-ass.net>
Date:   Mon, 3 Jul 2023 20:28:59 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Dave Wysochanski <dwysocha@...hat.com>,
        Ronnie Sahlberg <lsahlber@...hat.com>,
        Pavel Shilovsky <pshilov@...rosoft.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ajay Kaher <akaher@...are.com>
Subject: Re: Buggy rwsem locking code in fs/smb/client/file.c

On Mon, Jul 03, 2023 at 11:43:18AM -0400, Steven Rostedt wrote:
> I just reviewed a patch that copied a solution from
> fs/smb/client/file.c (original was fs/cifs/file.c), which is really
> just hiding a bug. And because this code could have possibly caused
> this buggy solution to be repeated, I believe it should be fixed,
> before others use it as precedent in other areas of the kernel.
> 
> Commit d46b0da7a33dd ("cifs: Fix cifsInodeInfo lock_sem deadlock when
> reconnect occurs") has in its change log:

Oh man, that's .... I gotta go buy a new WTF'o'meter again :/