linux-kernel - [PATCH] mm: Mark the OOM reaper thread as freezable

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Message-Id: <20210918233920.9174-1-sultan@kerneltoast.com>
Date:   Sat, 18 Sep 2021 16:39:20 -0700
From:   Sultan Alsawaf <sultan@...neltoast.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Sultan Alsawaf <sultan@...neltoast.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        David Rientjes <rientjes@...gle.com>,
        Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mm: Mark the OOM reaper thread as freezable

From: Sultan Alsawaf <sultan@...neltoast.com>

The OOM reaper thread uses wait_event_freezable() without actually being
marked as freezable. Fix it by adding a set_freezable() call.

Fixes: aac453635549 ("mm, oom: introduce oom reaper")
Signed-off-by: Sultan Alsawaf <sultan@...neltoast.com>
---
 mm/oom_kill.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 831340e7ad8b..46a742b57735 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -641,6 +641,8 @@ static void oom_reap_task(struct task_struct *tsk)
 
 static int oom_reaper(void *unused)
 {
+	set_freezable();
+
 	while (true) {
 		struct task_struct *tsk = NULL;
 
-- 
2.33.0