I have the same problem. The freeze happens in disk-heavy tasks being
run.. (cp, dd, ...)
I'm on Linux welcome 2.6.31-19-generic #56-Ubuntu SMP Thu Jan 28
02:39:34 UTC 2010 x86_64 GNU/Linux
Here a trace from Virtualbox (when I was creating a disk of 40GB)
[ 600.427705] INFO: task VirtualBox:2495 blocked for more than 120 seconds.
[ 600.427708] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 600.427711] VirtualBox D 00000000ffffffff 0 2495 2428 0x00000000
[ 600.427716] ffff8801c89c1a08 0000000000000082 ffff8800280441c8
0000000000015880
[ 600.427722] ffff880214573110 0000000000015880 0000000000015880
0000000000015880
[ 600.427727] 0000000000015880 ffff880214573110 0000000000015880
0000000000015880
[ 600.427732] Call Trace:
[ 600.427737] [<ffffffff811ebf95>] do_get_write_access+0x315/0x5e0
[ 600.427742] [<ffffffff81078a00>] ? wake_bit_function+0x0/0x40
[ 600.427747] [<ffffffff811ec3ec>] jbd2_journal_get_write_access+0x2c/0x50
[ 600.427753] [<ffffffff811d4680>] __ext4_journal_get_write_access+0x30/0x70
[ 600.427758] [<ffffffff811b394b>] ext4_reserve_inode_write+0x6b/0x90
[ 600.427763] [<ffffffff811b39b7>] ext4_mark_inode_dirty+0x47/0x1d0
[ 600.427768] [<ffffffff811b3cb2>] ext4_dirty_inode+0x62/0xb0
[ 600.427773] [<ffffffff81140056>] __mark_inode_dirty+0x36/0x130
[ 600.427778] [<ffffffff81136544>] inode_setattr+0x74/0x170
[ 600.427782] [<ffffffff811b3e7e>] ext4_setattr+0x17e/0x360
[ 600.427787] [<ffffffff811367a3>] notify_change+0x163/0x340
[ 600.427792] [<ffffffff8111dfb9>] do_truncate+0x69/0x90
[ 600.427797] [<ffffffff81420b58>] ? common_perm+0x48/0x90
[ 600.427802] [<ffffffff81128720>] ? get_write_access+0x40/0x70
[ 600.427807] [<ffffffff81129226>] may_open+0x1e6/0x220
[ 600.427812] [<ffffffff8112cb58>] do_filp_open+0x208/0xac0
[ 600.427817] [<ffffffff8127cf42>] ? __strncpy_from_user+0x22/0x60
[ 600.427822] [<ffffffff811376b2>] ? alloc_fd+0x102/0x150
[ 600.427827] [<ffffffff8111d094>] do_sys_open+0x64/0x160
[ 600.427832] [<ffffffff8111d1bb>] sys_open+0x1b/0x20
[ 600.427837] [<ffffffff81012002>] system_call_fastpath+0x16/0x1b
--
INFO: task blocked for more than 120 seconds causes system freeze
https://bugs.launchpad.net/bugs/276476
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