The patch titled
Subject: oom, oom_reaper: disable oom_reaper for oom_kill_allocating_task
has been added to the -mm tree. Its filename is
oom-oom_reaper-disable-oom_reaper-for-oom_kill_allocating_task.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/oom-oom_reaper-disable-oom_reaper-for-oom_kill_allocating_task.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/oom-oom_reaper-disable-oom_reaper-for-oom_kill_allocating_task.patch
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------------------------------------------------------
From: Michal Hocko <mhocko@xxxxxxxx>
Subject: oom, oom_reaper: disable oom_reaper for oom_kill_allocating_task
Tetsuo has reported that oom_kill_allocating_task=1 will cause
oom_reaper_list corruption because oom_kill_process doesn't follow
standard OOM exclusion (aka ignores TIF_MEMDIE) and allows to enqueue
the same task multiple times - e.g. by sacrificing the same child
multiple times.
This patch fixes the issue by introducing a new MMF_OOM_KILLED mm flag
which is set in oom_kill_process atomically and oom reaper is disabled
if the flag was already set.
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Reported-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/sched.h | 2 ++
mm/oom_kill.c | 6 +++++-
2 files changed, 7 insertions(+), 1 deletion(-)
diff -puN include/linux/sched.h~oom-oom_reaper-disable-oom_reaper-for-oom_kill_allocating_task include/linux/sched.h
--- a/include/linux/sched.h~oom-oom_reaper-disable-oom_reaper-for-oom_kill_allocating_task
+++ a/include/linux/sched.h
@@ -513,6 +513,8 @@ static inline int get_dumpable(struct mm
#define MMF_HAS_UPROBES 19 /* has uprobes */
#define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
+#define MMF_OOM_KILLED 21 /* OOM killer has chosen this mm */
+
#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
struct sighand_struct {
diff -puN mm/oom_kill.c~oom-oom_reaper-disable-oom_reaper-for-oom_kill_allocating_task mm/oom_kill.c
--- a/mm/oom_kill.c~oom-oom_reaper-disable-oom_reaper-for-oom_kill_allocating_task
+++ a/mm/oom_kill.c
@@ -686,7 +686,7 @@ void oom_kill_process(struct oom_control
unsigned int victim_points = 0;
static DEFINE_RATELIMIT_STATE(oom_rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
- bool can_oom_reap = true;
+ bool can_oom_reap;
/*
* If the task is already exiting, don't alarm the sysadmin or kill
@@ -748,6 +748,10 @@ void oom_kill_process(struct oom_control
/* Get a reference to safely compare mm after task_unlock(victim) */
mm = victim->mm;
atomic_inc(&mm->mm_count);
+
+ /* Make sure we do not try to oom reap the mm multiple times */
+ can_oom_reap = !test_and_set_bit(MMF_OOM_KILLED, &mm->flags);
+
/*
* We should send SIGKILL before setting TIF_MEMDIE in order to prevent
* the OOM victim from depleting the memory reserves from the user
_
Patches currently in -mm which might be from mhocko@xxxxxxxx are
mm-vmscan-make-zone_reclaimable_pages-more-precise.patch
mm-oom-introduce-oom-reaper.patch
oom-reaper-handle-mlocked-pages.patch
oom-clear-tif_memdie-after-oom_reaper-managed-to-unmap-the-address-space.patch
mm-oom_reaper-report-success-failure.patch
mm-oom_reaper-report-success-failure-fix-2.patch
mm-oom_reaper-implement-oom-victims-queuing.patch
oom-make-oom_reaper-freezable.patch
oom-oom_reaper-disable-oom_reaper-for-oom_kill_allocating_task.patch
mm-oom-rework-oom-detection.patch
mm-throttle-on-io-only-when-there-are-too-many-dirty-and-writeback-pages.patch
mm-use-watermak-checks-for-__gfp_repeat-high-order-allocations.patch
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