Comment 70 for bug 561210

I'm having a similar problem but copying a file from Ubuntu to a Windows share using smb/CIFS (as a result of a backup triggered from a cron job).
The problem occurs erratically and after hours I have to reboot the machine (only a 'ping' from another machine reveals that the system is alive...).
I'm running Ubuntu 10.04 Lucid, file is on LVM volume on top of a raid1/mdadm, swap directly over raid1/mdam
uname : Linux 2.6.32-25-generic #45-Ubuntu SMP Sat Oct 16 19:52:42 UTC 2010 x86_64 GNU/Linux

First lines in kernel log:
Nov 17 04:00:05 hernan kernel: [381217.309261] EXT4-fs (dm-1): ext4_orphan_cleanup: deleting unreferenced inode 3679614
...
Nov 17 04:00:05 hernan kernel: [381217.427197] EXT4-fs (dm-1): ext4_orphan_cleanup: deleting unreferenced inode 3679431
Nov 17 04:00:05 hernan kernel: [381217.427217] EXT4-fs (dm-1): 13 orphan inodes deleted
Nov 17 04:00:05 hernan kernel: [381217.427221] EXT4-fs (dm-1): recovery complete
Nov 17 04:00:05 hernan kernel: [381217.661830] EXT4-fs (dm-1): mounted filesystem with ordered data mode
Nov 17 04:12:40 hernan kernel: [381972.960362] CIFS VFS: Error -4 sending data on socket to server
Nov 17 04:12:40 hernan kernel: [381972.964846] CIFS VFS: No response to cmd 47 mid 34736
Nov 17 04:12:40 hernan kernel: [381972.964850] CIFS VFS: No response to cmd 47 mid 34734
Nov 17 04:12:40 hernan kernel: [381972.964854] CIFS VFS: Write2 ret -11, wrote 0
Nov 17 04:12:40 hernan kernel: [381972.964868] CIFS VFS: No response to cmd 47 mid 34711
Nov 17 04:12:40 hernan kernel: [381972.964877] CIFS VFS: No response to cmd 47 mid 34735
Nov 17 04:16:28 hernan kernel: [382200.850064] INFO: task kswapd0:52 blocked for more than 120 seconds.
Nov 17 04:16:28 hernan kernel: [382200.850071] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Nov 17 04:16:28 hernan kernel: [382200.850073] kswapd0 D ffffffffa004f3e0 0 52 2 0x00000000
Nov 17 04:16:28 hernan kernel: [382200.850078] ffff8801398e1590 0000000000000046 0000000000015bc0 0000000000015bc0
Nov 17 04:16:28 hernan kernel: [382200.850083] ffff88013a84df80 ffff8801398e1fd8 0000000000015bc0 ffff88013a84dbc0
Nov 17 04:16:28 hernan kernel: [382200.850087] 0000000000015bc0 ffff8801398e1fd8 0000000000015bc0 ffff88013a84df80
Nov 17 04:16:28 hernan kernel: [382200.850091] Call Trace:
Nov 17 04:16:28 hernan kernel: [382200.850102] [<ffffffff81541b6d>] schedule_timeout+0x22d/0x300
Nov 17 04:16:28 hernan kernel: [382200.850107] [<ffffffff81012b0e>] ? common_interrupt+0xe/0x13
Nov 17 04:16:28 hernan kernel: [382200.850111] [<ffffffff81542ace>] __down+0x7e/0xc0
Nov 17 04:16:28 hernan kernel: [382200.850116] [<ffffffff81089501>] down+0x41/0x50
Nov 17 04:16:28 hernan kernel: [382200.850123] [<ffffffffa0488719>] cifs_reconnect_tcon+0x1a9/0x2f0 [cifs]
Nov 17 04:16:28 hernan kernel: [382200.850130] [<ffffffffa048daf7>] small_smb_init+0x37/0x80 [cifs]
Nov 17 04:16:28 hernan kernel: [382200.850136] [<ffffffffa048eeba>] CIFSSMBWrite2+0x7a/0x290 [cifs]
Nov 17 04:16:28 hernan kernel: [382200.850143] [<ffffffffa049a8af>] cifs_write+0x1bf/0x480 [cifs]
Nov 17 04:16:28 hernan kernel: [382200.850150] [<ffffffffa049d6ee>] T.1064+0xee/0x190 [cifs]
Nov 17 04:16:28 hernan kernel: [382200.850157] [<ffffffffa049d7e7>] cifs_writepage+0x57/0x110 [cifs]
Nov 17 04:16:28 hernan kernel: [382200.850161] [<ffffffff81101293>] pageout+0x123/0x280
Nov 17 04:16:28 hernan kernel: [382200.850165] [<ffffffff81101853>] shrink_page_list+0x263/0x600
Nov 17 04:16:28 hernan kernel: [382200.850170] [<ffffffff8113ba69>] ? mem_cgroup_del_lru+0x39/0x40
Nov 17 04:16:28 hernan kernel: [382200.850173] [<ffffffff811005bb>] ? isolate_lru_pages+0xdb/0x260
Nov 17 04:16:28 hernan kernel: [382200.850176] [<ffffffff81012b0e>] ? common_interrupt+0xe/0x13
Nov 17 04:16:28 hernan kernel: [382200.850179] [<ffffffff81101efe>] shrink_inactive_list+0x30e/0x810
Nov 17 04:16:28 hernan kernel: [382200.850184] [<ffffffff810fc0ba>] ? determine_dirtyable_memory+0x1a/0x30
Nov 17 04:16:28 hernan kernel: [382200.850188] [<ffffffff810fc167>] ? get_dirty_limits+0x27/0x2f0
Nov 17 04:16:28 hernan kernel: [382200.850191] [<ffffffff81102491>] shrink_list+0x91/0xf0
Nov 17 04:16:28 hernan kernel: [382200.850194] [<ffffffff81102687>] shrink_zone+0x197/0x240
Nov 17 04:16:28 hernan kernel: [382200.850197] [<ffffffff81103719>] balance_pgdat+0x659/0x6d0
Nov 17 04:16:28 hernan kernel: [382200.850201] [<ffffffff81100740>] ? isolate_pages_global+0x0/0x50
Nov 17 04:16:28 hernan kernel: [382200.850204] [<ffffffff8110388e>] kswapd+0xfe/0x150
Nov 17 04:16:28 hernan kernel: [382200.850208] [<ffffffff81084580>] ? autoremove_wake_function+0x0/0x40
Nov 17 04:16:28 hernan kernel: [382200.850211] [<ffffffff81103790>] ? kswapd+0x0/0x150
Nov 17 04:16:28 hernan kernel: [382200.850214] [<ffffffff81084206>] kthread+0x96/0xa0
Nov 17 04:16:28 hernan kernel: [382200.850217] [<ffffffff810131ea>] child_rip+0xa/0x20
Nov 17 04:16:28 hernan kernel: [382200.850220] [<ffffffff81084170>] ? kthread+0x0/0xa0
Nov 17 04:16:28 hernan kernel: [382200.850223] [<ffffffff810131e0>] ? child_rip+0x0/0x20