linux-kernel - Re: [Linux-v4.6-rc1] ext4: WARNING: CPU: 2 PID: 2692 at kernel/locking/lockdep.c:2017 __lock

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Message-ID: <CA+55aFw-YXACVasN4n0h03QWgWWwvBray2fcMScAnEn0Wy_Ohw@mail.gmail.com>
Date:	Sun, 27 Mar 2016 05:03:44 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Sedat Dilek <sedat.dilek@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	"Theodore Ts'o" <tytso@....edu>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Linux-v4.6-rc1] ext4: WARNING: CPU: 2 PID: 2692 at
 kernel/locking/lockdep.c:2017 __lock_acquire+0x180e/0x2260

On Sun, Mar 27, 2016 at 1:57 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> I pulled ext4.git#dev on top of Linux v4.6-rc1...
>
> ... and did not see the call-trace.

Unless you're using overlayfs or per-file encryption, I'm not seeing
that any of that should make any difference (but it's entirely
possible I'm missing something).

Was it entirely repeatable before? Maybe it just happened to happen
without that update, and then happened to _not_ happen after you
rebooted with that 'dev' branch pulled in?

Anyway, I don't think that DEBUG_LOCKS_WARN_ON() in

  kernel/locking/lockdep.c:2017 __lock_acquire

would be an ext4 issue, it looks more like an internal lockdep issue.

Adding in the lockdep people, who will set me right.

                 Linus