linux-kernel - khugepaged doesn't want to freeze

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Message-ID: <4EB8E969.6010502@suse.cz>
Date:	Tue, 08 Nov 2011 09:33:45 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	"Rafael J. Wysocki" <rjw@...e.com>
CC:	linux-pm@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Jiri Slaby <jirislaby@...il.com>, linux-mm@...ck.org,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: khugepaged doesn't want to freeze

Hi,

yesterday my machine refused to suspend several times. It was always due
to khugepaged refusing to freeze. It's with 3.1.0-next-20111025.

In the end, after several tries, it finally did. But it's indeed
bothering me.

PM: Syncing filesystems ... done.
PM: Preparing system for mem sleep
Freezing user space processes ... (elapsed 0.01 seconds) done.
Freezing remaining freezable tasks ...
Freezing of tasks failed after 20.01 seconds (1 tasks refusing to
freeze, wq_busy=0):
khugepaged      S 0000000000000001     0   634      2 0x00800000
 ffff8801c11cbc90 0000000000000046 0000000000000003 0000000000000000
 ffff8801c16f73e0 ffff8801c11cbfd8 ffff8801c11cbfd8 ffff8801c11cbfd8
 ffffffff81a0d020 ffff8801c16f73e0 ffff8801c11cbd08 0000000100000001
Call Trace:
 [<ffffffff8161e3aa>] schedule+0x3a/0x50
 [<ffffffff8161e83e>] schedule_timeout+0x14e/0x220
 [<ffffffff81079710>] ? init_timer_deferrable_key+0x20/0x20
 [<ffffffff8161e969>] schedule_timeout_interruptible+0x19/0x20
 [<ffffffff8110eda0>] khugepaged_alloc_hugepage+0xc0/0xf0
 [<ffffffff8108a0d0>] ? add_wait_queue+0x60/0x60
 [<ffffffff8110f455>] khugepaged+0x85/0x1280
 [<ffffffff8108a0d0>] ? add_wait_queue+0x60/0x60
 [<ffffffff8110f3d0>] ? collect_mm_slot+0xa0/0xa0
 [<ffffffff81089937>] kthread+0x87/0x90
 [<ffffffff81621834>] kernel_thread_helper+0x4/0x10
 [<ffffffff810898b0>] ? kthread_worker_fn+0x1a0/0x1a0
 [<ffffffff81621830>] ? gs_change+0xb/0xb

Restarting tasks ... done.

thanks,
-- 
js
suse labs
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