From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: torvalds@linux-foundation.org, mhocko@kernel.org
Cc: 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 20:22:35 +0900 [thread overview]
Message-ID: <201801122022.IDI35401.VOQOFOMLFSFtHJ@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <CA+55aFx4pH4odYDfuGemm5TK-CS4E8pL_ipHCVzVBmsQkyWp1Q@mail.gmail.com>
Tetsuo Handa wrote:
> Michal Hocko wrote:
> > All of those seem to be file pages. So maybe try to use a different FS.
>
> Maybe that's the next thing I should try.
xfs versus ext4 => Both triggers the bug
Linus Torvalds wrote:
> On Thu, Jan 11, 2018 at 5:31 PM, Tetsuo Handa
> <penguin-kernel@i-love.sakura.ne.jp> wrote:
> >
> > Thus, I suspect that somewhere is confusing HighMem pages and !HighMem pages.
>
> Hmm. I can't even imagine how you'd do that.
>
> Sure, if you take page_address() to get a kmap'ed linear address, and
> then feed that linear address back to virt_to_page(), you'd certainly
> get a crazy page. But that would be insane.. I don't see how you'd do
> that.
>
> Hmm. Do you have CONFIG_DEBUG_VIRTUAL enabled? That should catch at
> least the above case, it should enable a debugging version of
> __virt_to_phys() and use it.
>
CONFIG_DEBUG_VIRTUAL=y versus CONFIG_DEBUG_VIRTUAL=n => No difference
No mem= parameter versus mem=768M => Cannot trigger if mem=768M (i.e. not using HighMem)
CONFIG_SLUB=y versus CONFIG_SLAB=y => Both triggers the bug
CONFIG_DEBUG_PAGEALLOC=y versus CONFIG_DEBUG_PAGEALLOC=n => Cannot trigger if CONFIG_DEBUG_PAGEALLOC=n
I don't know whether there is a bug in CONFIG_DEBUG_PAGEALLOC=y code.
Config is at http://I-love.SAKURA.ne.jp/tmp/config-4.15-rc7-min .
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next prev parent reply other threads:[~2018-01-12 11:22 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 [this message]
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
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