From: Kirill Korotaev <dev@openvz.org>
Date: Thu, 7 Dec 2006 04:32:27 +0000 (-0800)
Subject: [PATCH] OOM can panic due to processes stuck in __alloc_pages()
X-Git-Tag: v2.6.20-rc1~145^2^2~334
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b43a57bb4dae72e8f7232e7c821a8799eda30022;p=pandora-kernel.git

[PATCH] OOM can panic due to processes stuck in __alloc_pages()

OOM can panic due to the processes stuck in __alloc_pages() doing infinite
rebalance loop while no memory can be reclaimed.  OOM killer tries to kill
some processes, but unfortunetaly, rebalance label was moved by someone
below the TIF_MEMDIE check, so buddy allocator doesn't see that process is
OOM-killed and it can simply fail the allocation :/

Observed in reality on RHEL4(2.6.9)+OpenVZ kernel when a user doing some
memory allocation tricks triggered OOM panic.

Signed-off-by: Denis Lunev <den@sw.ru>
Signed-off-by: Kirill Korotaev <dev@openvz.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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