M. Vefa Bicakci reported 2.6.35 kernel hang up when hibernation on his 32bit 3GB mem machine. (https://bugzilla.kernel.org/show_bug.cgi?id=16771) Also he was bisected first bad commit is below commit bb21c7ce18eff8e6e7877ca1d06c6db719376e3c Author: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> Date: Fri Jun 4 14:15:05 2010 -0700 vmscan: fix do_try_to_free_pages() return value when priority==0 reclaim failure At first impression, this seemed very strange because the above commit only chenged function return value and hibernate_preallocate_memory() ignore return value of shrink_all_memory(). But it's related. Now, page allocation from hibernation code may enter infinite loop if the system has highmem. The reasons are two. 1) hibernate_preallocate_memory() call alloc_pages() wrong order 2) vmscan don't care enough OOM case when oom_killer_disabled. This patch only fix (2). Why is oom_killer_disabled so special? because when hibernation case, zone->all_unreclaimable never be turned on. hibernation freeze all tasks at first, then kswapd can't works in this case, and zone->all_unreclaimable is only turned from kswapd. Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Cc: "Rafael J. Wysocki" <rjw@xxxxxxx> Cc: M. Vefa Bicakci <bicave@xxxxxxxxxxxxxxx> Cc: stable@xxxxxxxxxx Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> --- mm/vmscan.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index c391c32..1919d8a 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -40,6 +40,7 @@ #include <linux/memcontrol.h> #include <linux/delayacct.h> #include <linux/sysctl.h> +#include <linux/oom.h> #include <asm/tlbflush.h> #include <asm/div64.h> @@ -1931,7 +1932,7 @@ out: return sc->nr_reclaimed; /* top priority shrink_zones still had more to do? don't OOM, then */ - if (scanning_global_lru(sc) && !all_unreclaimable) + if (scanning_global_lru(sc) && !all_unreclaimable && !oom_killer_disabled) return 1; return 0; -- 1.6.5.2 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>