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From: Ming Lei <ming.lei@redhat.com>
To: "Theodore Y. Ts'o" <tytso@mit.edu>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-ext4@vger.kernel.org,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	linux-block@vger.kernel.org,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: REGRESSION: 37f4a24c2469: blk-mq: centralise related handling into blk_mq_get_driver_tag
Date: Fri, 18 Sep 2020 07:08:42 +0800	[thread overview]
Message-ID: <20200917230842.GA1139137@T590> (raw)
In-Reply-To: <20200917143012.GF38283@mit.edu>

On Thu, Sep 17, 2020 at 10:30:12AM -0400, Theodore Y. Ts'o wrote:
> On Thu, Sep 17, 2020 at 10:20:51AM +0800, Ming Lei wrote:
> > 
> > Obviously there is other more serious issue, since 568f27006577 is
> > completely reverted in your test, and you still see list corruption
> > issue.
> > 
> > So I'd suggest to find the big issue first. Once it is fixed, maybe
> > everything becomes fine.
> > ...
> > Looks it is more like a memory corruption issue, is there any helpful log
> > dumped when running kernel with kasan?
> 
> Last night, I ran six VM's using -rc4 with and without KASAN; without
> Kasan, half of them hung.  With KASAN enabled, all of the test VM's
> ran to completion.

From your last email, when you run -rc4 with revert of 568f27006577, you
can observe list corruption easily.

So can you enable KASAN on -rc4 with revert of 568f27006577 and see if
it makes a difference?

> 
> This strongly suggests whatever the problem is, it's timing related.
> I'll run a larger set of test runs to see if this pattern is confirmed
> today.

Looks you enable lots of other debug options, such a lockdep, which has
much much heavy runtime load. Maybe you can disable all non-KASAN debug
option(non-KASAN memory debug options, lockdep, ...) and keep KASAN
debug only and see if you are lucky.


Thanks, 
Ming


  reply	other threads:[~2020-09-17 23:09 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-03 23:02 [PATCH] ext4: flag as supporting buffered async reads Jens Axboe
2020-08-11 14:31 ` Jens Axboe
2020-08-18 18:11 ` Theodore Y. Ts'o
2020-08-18 18:12   ` Jens Axboe
2020-08-21 21:26     ` Jens Axboe
2020-08-22 14:33       ` Theodore Y. Ts'o
2020-08-22 15:48         ` Jens Axboe
2020-08-24 10:56           ` Jens Axboe
2020-08-25 14:18             ` Jens Axboe
2020-08-27  1:54               ` Jens Axboe
2020-09-04  0:10                 ` Jens Axboe
2020-09-04  3:55                   ` Theodore Y. Ts'o
2020-09-04 14:51                     ` Jens Axboe
2020-09-04 15:25                       ` Darrick J. Wong
2020-09-15  4:45                     ` REGRESSION: 37f4a24c2469: blk-mq: centralise related handling into blk_mq_get_driver_tag Theodore Y. Ts'o
2020-09-15  7:33                       ` Ming Lei
2020-09-15 22:45                         ` Theodore Y. Ts'o
2020-09-15 23:09                           ` Ming Lei
2020-09-16 20:20                             ` Theodore Y. Ts'o
2020-09-17  2:20                               ` Ming Lei
2020-09-17 14:30                                 ` Theodore Y. Ts'o
2020-09-17 23:08                                   ` Ming Lei [this message]
2020-09-24  0:59                                   ` Ming Lei
2020-09-24 14:33                                     ` Theodore Y. Ts'o
2020-09-25  1:13                                       ` Theodore Y. Ts'o
2020-09-25  7:31                                         ` Ming Lei
2020-09-25 16:19                                           ` Ming Lei
2020-09-25 16:32                                             ` Shakeel Butt
2020-09-25 16:32                                               ` Shakeel Butt
2020-09-25 16:47                                               ` Shakeel Butt
2020-09-25 16:47                                                 ` Shakeel Butt
2020-09-25 17:22                                                 ` Roman Gushchin
2020-09-25 17:17                                             ` Linus Torvalds
2020-09-25 17:17                                               ` Linus Torvalds
2020-09-25 17:22                                               ` Shakeel Butt
2020-09-25 17:22                                                 ` Shakeel Butt
2020-09-25 17:35                                                 ` Shakeel Butt
2020-09-25 17:35                                                   ` Shakeel Butt
2020-09-25 17:47                                                   ` Roman Gushchin
2020-09-25 17:58                                                     ` Shakeel Butt
2020-09-25 17:58                                                       ` Shakeel Butt
2020-09-25 19:19                                                       ` Shakeel Butt
2020-09-25 19:19                                                         ` Shakeel Butt
2020-09-25 20:56                                                         ` Roman Gushchin
2020-09-25 21:18                                                           ` Shakeel Butt
2020-09-25 21:18                                                             ` Shakeel Butt
2020-09-27 17:38                                                             ` Theodore Y. Ts'o
2020-09-26  1:43                                                         ` Ming Lei
2020-09-26  6:42                                                           ` Roman Gushchin
2020-09-25  1:14                                       ` Ming Lei
2020-09-25  2:34                                         ` Ming Lei
2020-10-02 20:08 ` [PATCH] ext4: flag as supporting buffered async reads Theodore Y. Ts'o
2020-10-02 20:10   ` Jens Axboe

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