linux-kernel - Re: WARNING in try

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Date:   Tue, 7 Aug 2018 00:32:50 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        Michal Hocko <mhocko@...nel.org>
Cc:     syzbot <syzbot+bab151e82a4e973fa325@...kaller.appspotmail.com>,
        cgroups@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>
Subject: Re: WARNING in try_charge

Now, let's test next-20180803 .

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 116b181bb646afedd770985de20a68721bdb2648

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 4603ad75c9a9..852cd3dbdcd9 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1388,6 +1388,8 @@ static bool mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
 	bool ret;
 
 	mutex_lock(&oom_lock);
+	pr_info("task=%s pid=%d invoked memcg oom killer. oom_victim=%d\n",
+			current->comm, current->pid, tsk_is_oom_victim(current));
 	ret = out_of_memory(&oc);
 	mutex_unlock(&oom_lock);
 	return ret;