From: Sedat Dilek <sedat.dilek@gmail.com>
To: "Theodore Ts'o" <tytso@mit.edu>,
Linus Torvalds <torvalds@linux-foundation.org>,
Sedat Dilek <sedat.dilek@gmail.com>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [Linux-v4.6-rc1] ext4: WARNING: CPU: 2 PID: 2692 at kernel/locking/lockdep.c:2017 __lock_acquire+0x180e/0x2260
Date: Sun, 27 Mar 2016 21:40:07 +0200 [thread overview]
Message-ID: <CA+icZUXsM_Uzc5jp-OvbPhqq6x2zV7a5L+30cbhAwq1PL48r1A@mail.gmail.com> (raw)
In-Reply-To: <20160327182351.GH31129@thunk.org>
On Sun, Mar 27, 2016 at 8:23 PM, Theodore Ts'o <tytso@mit.edu> wrote:
> On Sun, Mar 27, 2016 at 05:03:44AM -0700, Linus Torvalds wrote:
>>
>> 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.
>
> That's my guess. I've been doing a lot of regression testing with
> lockdep enabled, and I haven't seen the problem which Sedat has
> reported.
>
> At the moment I'm testing my ext4 bug fixes on top of 243d5067858310
> (Merge branch 'overlayfs-linus'....) dating from March 22nd, and the
> lockdep merges came much earlier than that, on March 15th, just two
> days after v4.5 was released, and I'm not noticing any lockdep issues
> with ext4 while running all of my regression tests.
>
So far I can say, that I am *not* seeing this with ext4.git#dev on top
of v4.6-rc1.
Not sure how I can force/reproduce the lockdep call-trace.
Any idea on how to check/test lockdep issues like this?
LTP? (Latest tarball: ltp-full-20160126.tar.xz?
xfstests?
xfstests-bld?
Does the linux-sources ship some test-suite?
- Sedat -
next prev parent reply other threads:[~2016-03-27 19:40 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-27 8:15 [Linux-v4.6-rc1] ext4: WARNING: CPU: 2 PID: 2692 at kernel/locking/lockdep.c:2017 __lock_acquire+0x180e/0x2260 Sedat Dilek
2016-03-27 8:57 ` Sedat Dilek
2016-03-27 12:03 ` Linus Torvalds
2016-03-27 13:32 ` Boqun Feng
2016-03-27 18:23 ` Theodore Ts'o
2016-03-27 19:40 ` Sedat Dilek [this message]
[not found] ` <CA+55aFwoKRpgq8OCTxUaP+8gOg-mnN3nbruYgiK32a=C5U4TkQ@mail.gmail.com>
2016-03-27 20:24 ` Sedat Dilek
2016-03-27 20:48 ` Peter Zijlstra
2016-03-27 20:59 ` Sedat Dilek
2016-03-27 21:48 ` Sedat Dilek
2016-03-28 1:05 ` Boqun Feng
2016-03-28 6:33 ` Peter Zijlstra
2016-03-29 8:47 ` Ingo Molnar
2016-03-30 9:20 ` Sedat Dilek
2016-03-30 9:36 ` Sedat Dilek
2016-03-30 9:36 ` Peter Zijlstra
2016-03-30 9:49 ` Sedat Dilek
2016-03-30 10:33 ` Sedat Dilek
2016-03-30 12:43 ` Peter Zijlstra
2016-03-30 12:46 ` Sedat Dilek
2016-03-30 13:15 ` Peter Zijlstra
2016-03-30 9:50 ` Peter Zijlstra
2016-03-30 9:59 ` Boqun Feng
2016-03-30 10:36 ` Peter Zijlstra
2016-03-30 11:07 ` Sedat Dilek
2016-03-31 15:42 ` Peter Zijlstra
2016-03-31 15:52 ` Boqun Feng
2016-04-02 6:26 ` Sedat Dilek
2016-03-30 14:06 ` Peter Zijlstra
2016-03-30 15:21 ` Sedat Dilek
2016-03-30 17:03 ` [PATCH] lockdep: print chain_key collision information Alfredo Alvarez Fernandez
2016-03-30 17:19 ` Peter Zijlstra
2016-04-01 6:36 ` [tip:core/urgent] locking/lockdep: Print " tip-bot for Alfredo Alvarez Fernandez
2016-05-10 9:09 ` Peter Zijlstra
2016-04-04 15:31 ` [Linux-v4.6-rc1] ext4: WARNING: CPU: 2 PID: 2692 at kernel/locking/lockdep.c:2017 __lock_acquire+0x180e/0x2260 Sedat Dilek
2016-04-04 16:02 ` Peter Zijlstra
2016-05-09 11:37 ` Sedat Dilek
2016-06-03 15:15 ` Sedat Dilek
2016-04-23 12:54 ` [tip:locking/urgent] lockdep: Fix lock_chain::base size tip-bot for Peter Zijlstra
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