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From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: torvalds@linux-foundation.org
Cc: mhocko@suse.com, linux-mm@kvack.org, x86@kernel.org,
	linux-fsdevel@vger.kernel.org
Subject: Re: [mm? 4.15-rc7] Random oopses under memory pressure.
Date: Fri, 12 Jan 2018 05:59:04 +0900	[thread overview]
Message-ID: <201801120559.FIE00099.MHJFVQSOFFOtLO@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <CA+55aFwj+x42UtTg4AEbgdW2p6TaZRPjT+BpN1qDrrBh1G8aRA@mail.gmail.com>

Linus Torvalds wrote:
> On Thu, Jan 11, 2018 at 6:11 AM, Tetsuo Handa
> <penguin-kernel@i-love.sakura.ne.jp> wrote:
> >
> > I retested with some debug printk() patch.
> 
> Could you perhaps enable KASAN too?

Unfortunately, KASAN is not available for x86_32 kernels. Thus, I'm stuck.

> So presumably "page->mem_cgroup" was just a random pointer. Which
> probably means that "page" itself is not actually a page pointer, sinc
> e I assume there was no memory hotplug going on here?

Nothing special. No memory hotplug etc.

> Most (all?) of your other oopses seem to have somewhat similar
> patterns: shrink_inactive_list() -> rmap_walk_file() -> oops due to
> garbage.

Yes. In most cases, problems are detected by that sequence.

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      reply	other threads:[~2018-01-11 20:59 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-05 14:45 [x86? mm? fs? 4.15-rc6] Random oopses by simple write under memory pressure Tetsuo Handa
2018-01-09 10:39 ` [mm? 4.15-rc7] " Tetsuo Handa
2018-01-10 11:49   ` [mm? 4.15-rc7] Random oopses " Tetsuo Handa
2018-01-10 12:45     ` Michal Hocko
2018-01-10 13:37       ` Tetsuo Handa
2018-01-11 13:57         ` Michal Hocko
2018-01-11 14:11           ` Tetsuo Handa
2018-01-11 14:21             ` Michal Hocko
2018-01-11 14:37               ` Tetsuo Handa
2018-01-12  1:31               ` [mm " Tetsuo Handa
2018-01-12  1:42                 ` Linus Torvalds
2018-01-12 11:22                   ` Tetsuo Handa
2018-01-14 11:54                     ` Tetsuo Handa
2018-01-15 23:05                       ` Linus Torvalds
2018-01-16  1:15                         ` [mm 4.15-rc8] " Tetsuo Handa
2018-01-16  2:14                           ` Linus Torvalds
2018-01-16  8:06                             ` Dave Hansen
2018-01-16  8:37                               ` Ingo Molnar
2018-01-16 19:30                               ` Linus Torvalds
2018-01-16 17:33                             ` Tetsuo Handa
2018-01-16 19:34                               ` Linus Torvalds
2018-01-17 11:08                                 ` Tetsuo Handa
2018-01-17 21:39                                   ` Linus Torvalds
2018-01-17 21:51                                     ` Linus Torvalds
2018-01-17 22:04                                       ` Dave Hansen
2018-01-17 22:00                                     ` Dave Hansen
2018-01-17 22:15                                       ` Linus Torvalds
2018-01-18  8:12                                   ` Tetsuo Handa
2018-01-18 12:25                                     ` Kirill A. Shutemov
2018-01-18 13:12                                       ` Kirill A. Shutemov
2018-01-18 14:34                                         ` Kirill A. Shutemov
2018-01-18 14:38                                         ` Dave Hansen
2018-01-18 14:45                                           ` Kirill A. Shutemov
2018-01-18 14:51                                             ` Dave Hansen
2018-01-18 16:58                                           ` Linus Torvalds
2018-01-18 14:45                                       ` Dave Hansen
2018-01-18 14:58                                         ` Andrea Arcangeli
2018-01-18 16:56                                           ` Kirill A. Shutemov
2018-01-18 17:26                                             ` Luck, Tony
2018-01-18 17:28                                               ` Linus Torvalds
2018-01-18 17:26                                             ` Linus Torvalds
2018-01-18 23:49                                               ` Kirill A. Shutemov
2018-01-19 12:55                                                 ` Matthew Wilcox
2018-01-19 18:42                                                   ` Linus Torvalds
2018-01-19 22:12                                                     ` Al Viro
2018-01-19 22:53                                                       ` Linus Torvalds
2018-01-20  2:02                                                         ` Al Viro
2018-01-20  5:24                                                           ` Al Viro
2018-01-20  9:38                                                             ` Luc Van Oostenryck
2018-01-18 15:40                                         ` Kirill A. Shutemov
2018-01-18 17:22                                           ` Michal Hocko
2018-01-19 10:02                                             ` Kirill A. Shutemov
2018-01-19 10:33                                               ` Michal Hocko
2018-01-19 11:49                                                 ` Kirill A. Shutemov
2018-01-19 12:07                                                   ` Michal Hocko
2018-01-19 12:30                                                     ` Kirill A. Shutemov
2018-01-19  2:01                                           ` Tetsuo Handa
2018-01-11 18:11             ` [mm? 4.15-rc7] " Linus Torvalds
2018-01-11 20:59               ` Tetsuo Handa [this message]

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