From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx140.postini.com [74.125.245.140]) by kanga.kvack.org (Postfix) with SMTP id 5B9DF6B0044 for ; Fri, 30 Mar 2012 18:23:51 -0400 (EDT) Received: by iajr24 with SMTP id r24so2079709iaj.14 for ; Fri, 30 Mar 2012 15:23:50 -0700 (PDT) MIME-Version: 1.0 From: Sasha Levin Date: Sat, 31 Mar 2012 00:23:30 +0200 Message-ID: Subject: mm: migrate_pages hang Content-Type: text/plain; charset=ISO-8859-1 Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton , Andrea Arcangeli , Hugh Dickins , Thomas Gleixner Cc: linux-mm@kvack.org, "linux-kernel@vger.kernel.org List" , Dave Jones Hi all, I saw the following inside a KVM guest, this is the first time I observed this hang and it seems to have started with today's (20120330) -next. [ 3122.093136] INFO: task trinity:17328 blocked for more than 120 seconds. [ 3122.093807] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 3122.095237] trinity D ffff8800703284d8 5648 17328 3101 0x00000004 [ 3122.096543] ffff8800064cfb08 0000000000000082 ffff8800064cfab8 ffffffff8107d346 [ 3122.098087] ffff8800064cffd8 00000000001d4580 ffff8800064ce010 00000000001d4580 [ 3122.099447] 00000000001d4580 00000000001d4580 ffff8800064cffd8 00000000001d4580 [ 3122.100607] Call Trace: [ 3122.100983] [] ? kvm_clock_read+0x46/0x80 [ 3122.101950] [] ? __lock_page+0x70/0x70 [ 3122.102761] [] schedule+0x24/0x70 [ 3122.103576] [] io_schedule+0x87/0xd0 [ 3122.104371] [] sleep_on_page+0x9/0x10 [ 3122.105179] [] __wait_on_bit_lock+0x52/0xb0 [ 3122.106042] [] __lock_page+0x62/0x70 [ 3122.106811] [] ? autoremove_wake_function+0x40/0x40 [ 3122.107450] [] lock_page+0x39/0x40 [ 3122.107976] [] __unmap_and_move+0x274/0x280 [ 3122.108848] [] ? list_del+0x11/0x40 [ 3122.109385] [] unmap_and_move+0x8d/0x130 [ 3122.109957] [] migrate_pages+0xab/0x150 [ 3122.110788] [] ? isolate_freepages+0x390/0x390 [ 3122.111399] [] compact_zone+0x1e1/0x2a0 [ 3122.111935] [] ? _raw_spin_unlock_irqrestore+0x75/0xa0 [ 3122.112579] [] __compact_pgdat+0x1b3/0x200 [ 3122.113199] [] compact_node+0x37/0x40 [ 3122.113631] [] ? lru_add_drain_all+0x10/0x20 [ 3122.114266] [] sysfs_compact_node+0x48/0x60 [ 3122.114768] [] ? sysfs_write_file+0x82/0xf0 [ 3122.115368] [] dev_attr_store+0x1b/0x20 [ 3122.115877] [] sysfs_write_file+0x9e/0xf0 [ 3122.116423] [] vfs_write+0xc8/0x190 [ 3122.116934] [] sys_write+0x4f/0x90 [ 3122.117697] [] system_call_fastpath+0x16/0x1b [ 3122.118354] 2 locks held by trinity/17328: [ 3122.118694] #0: (&buffer->mutex){+.+.+.}, at: [] sysfs_write_file+0x44/0xf0 [ 3122.119498] #1: (s_active#57){.+.+.+}, at: [] sysfs_write_file+0x82/0xf0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org