linux-kernel - [sched] Out of memory: Kill process 2999 (rc) score 9 or sacrifice child

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Message-ID: <20140809143034.GA28345@localhost>
Date:	Sat, 9 Aug 2014 22:30:34 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Dave Hansen <dave.hansen@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [sched] Out of memory: Kill process 2999 (rc) score 9 or sacrifice
 child

Hi Peter,

We noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/wait
commit d58d631b474c552dce72da2dce9dd276d731b79a ("sched: Fix finish_task_switch vs prev_state")

test case: vm-vp-quantal-x86_64/boot/1

9e6e6179961e8dd  d58d631b474c552dce72da2dc  testbox/testcase/testparams
---------------  -------------------------  ---------------------------
         0           +Inf%          1 ± 0%  TOTAL dmesg.Out_of_memory:Kill_process
         0           +Inf%          0 ±50%  TOTAL dmesg.Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes

In commit 9e6e6179961e8dd, the boot dmesg is

[    7.537598] Freeing unused kernel memory: 3352K (ffffffff82230000 - ffffffff82576000)
[    7.558273] random: init urandom read with 11 bits of entropy available
[    7.687132] init: Failed to create pty - disabling logging for job
[    7.688578] init: Temporary process spawn error: No space left on device
[   68.298970] reboot: Restarting system

In d58d631b474c552dce72da2dc, the OOM occurred immediately after the
"No space left on device" line. The qemu has mem=320M and the initrds
are 24M in total. What's interesting is, in the 5 boot tests for
d58d631b47 and its parent commit, this OOM message is 100%
reproducible on commit d58d631b47, while its parent boots all fine. 

Thanks,
Fengguang

View attachment ".dmesg" of type "text/plain" (70809 bytes)