From: Michal Hocko Date: Thu, 28 Jul 2016 22:45:16 +0000 (-0700) Subject: freezer, oom: check TIF_MEMDIE on the correct task X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a34c80a7294e34ba213c285dff38b1137745f94b;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git freezer, oom: check TIF_MEMDIE on the correct task freezing_slow_path() is checking TIF_MEMDIE to skip OOM killed tasks. It is, however, checking the flag on the current task rather than the given one. This is really confusing because freezing() can be called also on !current tasks. It would end up working correctly for its main purpose because __refrigerator will be always called on the current task so the oom victim will never get frozen. But it could lead to surprising results when a task which is freezing a cgroup got oom killed because only part of the cgroup would get frozen. This is highly unlikely but worth fixing as the resulting code would be more clear anyway. Link: http://lkml.kernel.org/r/1467029719-17602-2-git-send-email-mhocko@kernel.org Signed-off-by: Michal Hocko Cc: David Rientjes Cc: Miao Xie Cc: Miao Xie Cc: "Rafael J. Wysocki" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/kernel/freezer.c b/kernel/freezer.c index a8900a3bc27a..6f56a9e219fa 100644 --- a/kernel/freezer.c +++ b/kernel/freezer.c @@ -42,7 +42,7 @@ bool freezing_slow_path(struct task_struct *p) if (p->flags & (PF_NOFREEZE | PF_SUSPEND_TASK)) return false; - if (test_thread_flag(TIF_MEMDIE)) + if (test_tsk_thread_flag(p, TIF_MEMDIE)) return false; if (pm_nosig_freezing || cgroup_freezing(p))