I also get entries like this in /var/log/messages after dpkg's hang on sync():
kernel: [ 4918.834150] dpkg          D 0000000000000000     0  6043   6022 
0x00000000
kernel: [ 4918.834156]  ffff880108747d38 0000000000000082 0000000000015bc0 
0000000000015bc0
kernel: [ 4918.834161]  ffff88011e0d4890 ffff880108747fd8 0000000000015bc0 
ffff88011e0d44d0
kernel: [ 4918.834170]  0000000000015bc0 ffff880108747fd8 0000000000015bc0 
ffff88011e0d4890
kernel: [ 4918.834181] Call Trace:
kernel: [ 4918.834194]  [<ffffffff815583ad>] schedule_timeout+0x22d/0x300
kernel: [ 4918.834203]  [<ffffffff8105df52>] ? enqueue_entity+0x122/0x1a0
kernel: [ 4918.834211]  [<ffffffff8105e015>] ? enqueue_task_fair+0x45/0x90
kernel: [ 4918.834219]  [<ffffffff81557656>] wait_for_common+0xd6/0x180
kernel: [ 4918.834227]  [<ffffffff8105a254>] ? try_to_wake_up+0x284/0x380
kernel: [ 4918.834231]  [<ffffffff8105a350>] ? default_wake_function+0x0/0x20
kernel: [ 4918.834240]  [<ffffffff815577bd>] wait_for_completion+0x1d/0x20
kernel: [ 4918.834248]  [<ffffffff811666d7>] sync_inodes_sb+0x87/0xb0
kernel: [ 4918.834257]  [<ffffffff8116afb2>] __sync_filesystem+0x82/0x90
kernel: [ 4918.834265]  [<ffffffff8116b099>] sync_filesystems+0xd9/0x130
kernel: [ 4918.834272]  [<ffffffff8116b151>] sys_sync+0x21/0x40
kernel: [ 4918.834281]  [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b

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dpkg hangs while unpacking replacement
https://bugs.launchpad.net/bugs/624229
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