linux-kernel - mm: ksm: WARNING: CPU: 3 PID: 22593 at mm/ksm.c:715 remove_stable

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Date:	Thu, 17 Sep 2015 13:43:22 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	"linux-mm@...ck.org" <linux-mm@...ck.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: mm: ksm: WARNING: CPU: 3 PID: 22593 at mm/ksm.c:715 remove_stable_node+0xc7/0xf0()

Hi all,

I've observed the following warning while fuzzing with trinity inside a KVM tools
guest running -next:

[1385507.811807] Out of memory (oom_kill_allocating_task): Kill process 22593 (ksm04) score 0 or sacrifice child
[1385507.815277] Killed process 22612 (ksm04) total-vm:139476kB, anon-rss:131204kB, file-rss:896kB
[1385507.821799] Out of memory (oom_kill_allocating_task): Kill process 22593 (ksm04) score 0 or sacrifice child
[1385507.823082] Killed process 22613 (ksm04) total-vm:139476kB, anon-rss:131204kB, file-rss:896kB
[1385508.569555] Out of memory (oom_kill_allocating_task): Kill process 22593 (ksm04) score 0 or sacrifice child
[1385508.574114] Killed process 22614 (ksm04) total-vm:139476kB, anon-rss:131204kB, file-rss:896kB
[1385508.589529] Out of memory (oom_kill_allocating_task): Kill process 22593 (ksm04) score 0 or sacrifice child
[1385508.591203] Killed process 22593 (ksm04) total-vm:8408kB, anon-rss:148kB, file-rss:1508kB
[1385509.046298] ------------[ cut here ]------------
[1385509.047136] WARNING: CPU: 3 PID: 22593 at mm/ksm.c:715 remove_stable_node+0xc7/0xf0()
[1385509.048308] Modules linked in:
[1385509.069698] CPU: 3 PID: 22593 Comm: ksm04 Not tainted 4.3.0-rc1-next-20150914-sasha-00043-geddd763-dirty #2557
[1385509.072158]  ffffffffa4750740 ffff8803f60bfab0 ffffffff9bf8bc6a 0000000000000000
[1385509.073347]  ffff8803f60bfaf0 ffffffff9a369096 ffffffff9a7bd007 ffffea000042a5c0
[1385509.074533]  00000000fffffff0 0000000000000000 0000000000000000 ffffffffaaa16540
[1385509.075700] Call Trace:
[1385509.076152] dump_stack (lib/dump_stack.c:52)
[1385509.076971] warn_slowpath_common (kernel/panic.c:448)
[1385509.078823] warn_slowpath_null (kernel/panic.c:482)
[1385509.079700] remove_stable_node (mm/ksm.c:715 (discriminator 3))
[1385509.080565] remove_all_stable_nodes (mm/ksm.c:751)
[1385509.081515] run_store (include/linux/oom.h:65 mm/ksm.c:2162)
[1385509.089983] kobj_attr_store (lib/kobject.c:780)
[1385509.092142] sysfs_kf_write (fs/sysfs/file.c:131)
[1385509.093899] kernfs_fop_write (fs/kernfs/file.c:312)
[1385509.094793] __vfs_write (fs/read_write.c:487)
[1385509.101787] vfs_write (fs/read_write.c:539)
[1385509.102575] SyS_write (fs/read_write.c:586 fs/read_write.c:577)
[1385509.106273] tracesys_phase2 (arch/x86/entry/entry_64.S:273)
[1385509.188672] ---[ end trace 66cda70045475cf9 ]---


Thanks,
Sasha
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