From: Dave Hansen <dave.hansen@linux.intel.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Mel Gorman <mgorman@techsingularity.net>,
Tony Luck <tony.luck@intel.com>, Vlastimil Babka <vbabka@suse.cz>,
Michal Hocko <mhocko@kernel.org>, Ingo Molnar <mingo@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
the arch/x86 maintainers <x86@kernel.org>
Subject: Re: [mm 4.15-rc8] Random oopses under memory pressure.
Date: Wed, 17 Jan 2018 14:04:51 -0800 [thread overview]
Message-ID: <4fe52147-b6a1-83a7-ee4b-104846ddb919@linux.intel.com> (raw)
In-Reply-To: <CA+55aFySaBgxmNA3f_u4ebBEdD7Smq68s0qjMCntzuzP3c_gqQ@mail.gmail.com>
On 01/17/2018 01:51 PM, Linus Torvalds wrote:
> In fact, it seems to be such a fundamental bug that I suspect I'm
> entirely wrong, and full of shit. So it's an interesting and not
> _obviously_ incorrect theory, but I suspect I must be missing
> something.
I'll just note that a few of the pfns I decoded were smack in the middle
of the zone, not near either the high or low end of ZONE_NORMAL where we
would expect this cross-zone stuff to happen.
But I guess we could get similar wonkiness where 'struct page' is
screwed up in so many different ways if during buddy joining you do:
list_del(&buddy->lru);
and 'buddy' is off in another zone for which you do not hold the
spinlock. If we are somehow missing some locking, or double-allocating
a page, something like this would help:
static inline void rmv_page_order(struct page *page)
{
+ WARN_ON_ONCE(!PageBuddy(page));
__ClearPageBuddy(page);
set_page_private(page, 0);
}
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2018-01-17 22:04 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 [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4fe52147-b6a1-83a7-ee4b-104846ddb919@linux.intel.com \
--to=dave.hansen@linux.intel.com \
--cc=akpm@linux-foundation.org \
--cc=hannes@cmpxchg.org \
--cc=iamjoonsoo.kim@lge.com \
--cc=kirill.shutemov@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@techsingularity.net \
--cc=mhocko@kernel.org \
--cc=mingo@kernel.org \
--cc=penguin-kernel@i-love.sakura.ne.jp \
--cc=tony.luck@intel.com \
--cc=torvalds@linux-foundation.org \
--cc=vbabka@suse.cz \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).