From: Hugh Dickins <hugh@veritas.com>
To: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>,
Andrew Morton <akpm@linux-foundation.org>,
Rik van Riel <riel@redhat.com>,
Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Nick Piggin <npiggin@suse.de>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
kernel-testers@vger.kernel.org
Subject: Re: [PATCH][RFC] fix kernel BUG at mm/migrate.c:719! in 2.6.26-rc5-mm3
Date: Tue, 17 Jun 2008 19:33:32 +0100 (BST) [thread overview]
Message-ID: <Pine.LNX.4.64.0806171925200.21436@blonde.site> (raw)
In-Reply-To: <1213724798.8707.41.camel@lts-notebook>
On Tue, 17 Jun 2008, Lee Schermerhorn wrote:
>
> Now I wonder if the assertion that newpage count == 1 could be violated?
> I don't see how. We've just allocated and filled it and haven't
> unlocked it yet, so we should hold the only reference. Do you agree?
Disagree: IIRC, excellent example of the kind of assumption
that becomes invalid with Nick's speculative page references.
Someone interested in the previous use of the page may have
incremented the refcount, and in due course will find that
it's got reused for something else, and will then back off.
Hugh
next prev parent reply other threads:[~2008-06-17 18:34 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-12 5:59 2.6.26-rc5-mm3 Andrew Morton
2008-06-12 7:58 ` 2.6.26-rc5-mm3: kernel BUG at mm/vmscan.c:510 Alexey Dobriyan
2008-06-12 8:22 ` Andrew Morton
2008-06-12 8:23 ` Alexey Dobriyan
2008-06-12 8:44 ` [BUG] 2.6.26-rc5-mm3 kernel BUG at mm/filemap.c:575! Kamalesh Babulal
2008-06-12 8:57 ` Andrew Morton
2008-06-12 11:20 ` KAMEZAWA Hiroyuki
2008-06-13 1:44 ` [PATCH] fix double unlock_page() in " KAMEZAWA Hiroyuki
2008-06-13 2:13 ` Andrew Morton
2008-06-13 15:30 ` Lee Schermerhorn
2008-06-15 3:59 ` Kamalesh Babulal
2008-06-16 14:49 ` Lee Schermerhorn
2008-06-17 2:32 ` KAMEZAWA Hiroyuki
2008-06-17 15:26 ` Lee Schermerhorn
2008-06-13 4:34 ` Valdis.Kletnieks
2008-06-14 13:32 ` Kamalesh Babulal
2008-06-12 11:38 ` [BUG] " Nick Piggin
2008-06-13 0:25 ` KAMEZAWA Hiroyuki
2008-06-13 4:18 ` Valdis.Kletnieks
2008-06-13 7:16 ` Andrew Morton
2008-06-12 23:32 ` 2.6.26-rc5-mm3 Byron Bradley
2008-06-12 23:55 ` 2.6.26-rc5-mm3 Daniel Walker
2008-06-13 0:04 ` 2.6.26-rc5-mm3 Byron Bradley
2008-06-18 17:55 ` 2.6.26-rc5-mm3 Daniel Walker
2008-06-19 9:13 ` 2.6.26-rc5-mm3 Ingo Molnar
2008-06-19 14:39 ` 2.6.26-rc5-mm3 Daniel Walker
2008-06-17 7:35 ` [PATCH][RFC] fix kernel BUG at mm/migrate.c:719! in 2.6.26-rc5-mm3 Daisuke Nishimura
2008-06-17 7:47 ` [Bad page] trying to free locked page? (Re: [PATCH][RFC] fix kernel BUG at mm/migrate.c:719! in 2.6.26-rc5-mm3) Daisuke Nishimura
2008-06-17 9:03 ` KAMEZAWA Hiroyuki
2008-06-17 9:14 ` KOSAKI Motohiro
2008-06-17 9:15 ` Daisuke Nishimura
2008-06-17 18:29 ` Lee Schermerhorn
2008-06-17 20:00 ` [PATCH] unevictable mlocked pages: initialize mm member of munlock mm_walk structure Lee Schermerhorn
2008-06-18 3:33 ` KOSAKI Motohiro
2008-06-18 2:40 ` [Bad page] trying to free locked page? (Re: [PATCH][RFC] fix kernel BUG at mm/migrate.c:719! in 2.6.26-rc5-mm3) Daisuke Nishimura
2008-06-17 15:34 ` KOSAKI Motohiro
2008-06-18 2:32 ` Daisuke Nishimura
2008-06-18 10:20 ` KOSAKI Motohiro
2008-06-18 9:40 ` [Experimental][PATCH] putback_lru_page rework KAMEZAWA Hiroyuki
2008-06-18 11:36 ` KOSAKI Motohiro
2008-06-18 11:55 ` KAMEZAWA Hiroyuki
2008-06-19 8:00 ` Daisuke Nishimura
2008-06-19 8:24 ` KAMEZAWA Hiroyuki
2008-06-18 14:50 ` Daisuke Nishimura
2008-06-18 18:21 ` Lee Schermerhorn
2008-06-19 0:22 ` KAMEZAWA Hiroyuki
2008-06-19 14:45 ` Lee Schermerhorn
2008-06-20 0:47 ` KAMEZAWA Hiroyuki
2008-06-20 1:13 ` KAMEZAWA Hiroyuki
2008-06-20 17:10 ` Lee Schermerhorn
2008-06-20 20:41 ` Lee Schermerhorn
2008-06-21 8:56 ` KOSAKI Motohiro
2008-06-23 0:30 ` KAMEZAWA Hiroyuki
2008-06-21 8:41 ` KOSAKI Motohiro
2008-06-21 8:39 ` KOSAKI Motohiro
2008-06-19 15:32 ` kamezawa.hiroyu
2008-06-20 16:24 ` Lee Schermerhorn
2008-06-17 15:33 ` [PATCH][RFC] fix kernel BUG at mm/migrate.c:719! in 2.6.26-rc5-mm3 KOSAKI Motohiro
2008-06-18 1:54 ` Daisuke Nishimura
2008-06-18 4:41 ` Daisuke Nishimura
2008-06-18 4:59 ` KAMEZAWA Hiroyuki
2008-06-18 7:54 ` [PATCH][-mm] remove redundant page->mapping check KOSAKI Motohiro
2008-06-17 17:46 ` [PATCH][RFC] fix kernel BUG at mm/migrate.c:719! in 2.6.26-rc5-mm3 Lee Schermerhorn
2008-06-17 18:33 ` Hugh Dickins [this message]
2008-06-17 19:28 ` Lee Schermerhorn
2008-06-18 5:19 ` Nick Piggin
2008-06-18 2:59 ` Daisuke Nishimura
2008-06-18 1:13 ` KAMEZAWA Hiroyuki
2008-06-18 1:26 ` Daisuke Nishimura
2008-06-18 1:54 ` [PATCH] migration_entry_wait fix KAMEZAWA Hiroyuki
2008-06-18 5:26 ` KOSAKI Motohiro
2008-06-18 5:35 ` Nick Piggin
2008-06-18 6:04 ` KAMEZAWA Hiroyuki
2008-06-18 6:42 ` Nick Piggin
2008-06-18 6:52 ` KAMEZAWA Hiroyuki
2008-06-18 7:29 ` [PATCH -mm][BUGFIX] migration_entry_wait fix. v2 KAMEZAWA Hiroyuki
2008-06-18 7:26 ` KOSAKI Motohiro
2008-06-18 7:40 ` Nick Piggin
2008-06-19 6:59 ` [BUG][PATCH -mm] avoid BUG() in __stop_machine_run() Hidehiro Kawai
2008-06-19 10:12 ` Rusty Russell
2008-06-19 15:51 ` Jeremy Fitzhardinge
2008-06-20 13:21 ` Ingo Molnar
2008-06-23 3:55 ` Rusty Russell
2008-06-23 21:01 ` Ingo Molnar
2008-06-19 16:27 ` 2.6.26-rc5-mm3: BUG large value for HugePages_Rsvd Jon Tollefson
2008-06-19 17:16 ` Andy Whitcroft
2008-06-20 3:18 ` Jon Tollefson
2008-06-20 19:17 ` [RFC] hugetlb reservations -- MAP_PRIVATE fixes for split vmas Andy Whitcroft
2008-06-20 19:17 ` [PATCH 1/2] hugetlb reservations: move region tracking earlier Andy Whitcroft
2008-06-20 19:17 ` [PATCH 2/2] hugetlb reservations: fix hugetlb MAP_PRIVATE reservations across vma splits Andy Whitcroft
2008-06-23 7:33 ` Mel Gorman
2008-06-23 8:00 ` Mel Gorman
2008-06-23 9:53 ` Andy Whitcroft
2008-06-23 16:04 ` [RFC] hugetlb reservations -- MAP_PRIVATE fixes for split vmas Jon Tollefson
2008-06-23 17:35 ` [RFC] hugetlb reservations -- MAP_PRIVATE fixes for split vmas V2 Andy Whitcroft
2008-06-23 17:35 ` [PATCH 1/2] hugetlb reservations: move region tracking earlier Andy Whitcroft
2008-06-23 23:05 ` Mel Gorman
2008-06-23 17:35 ` [PATCH 2/2] hugetlb reservations: fix hugetlb MAP_PRIVATE reservations across vma splits V2 Andy Whitcroft
2008-06-23 23:08 ` Mel Gorman
2008-06-25 21:22 ` [RFC] hugetlb reservations -- MAP_PRIVATE fixes for split vmas V2 Jon Tollefson
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