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Commit 05fdda0d authored by Charan Teja Reddy's avatar Charan Teja Reddy
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lowmemorykiller: ignore the tasks that has null mm for reaping 



The setting of task_struct->mm to NULL might race when the same process
gets selected in the lowmemorykiller path for reaping of memory.So,
ignore the process for reaping when its mm NULL.

Change-Id: I40a50cc2f6dea892ed9b31df7aad59a349ff8c9c
Signed-off-by: default avatarCharan Teja Reddy <charante@codeaurora.org>
parent 2467fe92

drivers/staging/android/lowmemorykiller.c

+7 −5
Original line number Diff line number Diff line
@@ -561,13 +561,15 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc) 


		task_lock(selected);

		send_sig(SIGKILL, selected, 0);

		if (selected->mm)

		if (selected->mm) {

			task_set_lmk_waiting(selected);

		if (oom_reaper)

			if (!test_bit(MMF_OOM_SKIP, &selected->mm->flags) &&

			    oom_reaper) {

				mark_lmk_victim(selected);

		task_unlock(selected);

		if (oom_reaper)

				wake_oom_reaper(selected);

			}

		}

		task_unlock(selected);

		trace_lowmemory_kill(selected, cache_size, cache_limit, free);

		lowmem_print(1, "Killing '%s' (%d) (tgid %d), adj %hd,\n"

			"to free %ldkB on behalf of '%s' (%d) because\n"