i have to confirm this problem

Kernel & distribution version
Nov 27 08:34:44 core kernel: [    0.000000] Linux version 2.6.31-22-server 
(bui...@allspice) (gcc version 4.4.1 (Ubuntu 4.4.1-4ubuntu9) ) #68-Ubuntu SMP 
Tue Oct 26 16:50:02 UTC 2010 (Ubuntu 2.6.31-22.68-serv
er)


kern.log


Nov 27 04:41:54 core kernel: [1242602.033782] INFO: task kjournald2:407 blocked 
for more than 120 seconds.
Nov 27 04:41:54 core kernel: [1242602.033799] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Nov 27 04:41:54 core kernel: [1242602.033813] kjournald2    D 0000000000000000  
   0   407      2 0x00000000
Nov 27 04:41:54 core kernel: [1242602.033820]  ffff8801205fbad0 
0000000000000046 0000000000000002 0000000000015880
Nov 27 04:41:54 core kernel: [1242602.033827]  ffff8801210b47c0 
0000000000015880 0000000000015880 0000000000015880
Nov 27 04:41:54 core kernel: [1242602.033832]  0000000000015880 
ffff8801210b47c0 0000000000015880 0000000000015880
Nov 27 04:41:54 core kernel: [1242602.033839] Call Trace:
Nov 27 04:41:54 core kernel: [1242602.033857]  [<ffffffff810da1e0>] ? 
sync_page+0x0/0x50
Nov 27 04:41:54 core kernel: [1242602.033864]  [<ffffffff81529cd8>] 
io_schedule+0x28/0x40
Nov 27 04:41:54 core kernel: [1242602.033868]  [<ffffffff810da21d>] 
sync_page+0x3d/0x50
Nov 27 04:41:54 core kernel: [1242602.033872]  [<ffffffff8152a1f7>] 
__wait_on_bit+0x57/0x80
Nov 27 04:41:54 core kernel: [1242602.033876]  [<ffffffff810da38e>] 
wait_on_page_bit+0x6e/0x80
Nov 27 04:41:54 core kernel: [1242602.033882]  [<ffffffff810785b0>] ? 
wake_bit_function+0x0/0x40
Nov 27 04:41:54 core kernel: [1242602.033888]  [<ffffffff810e4640>] ? 
pagevec_lookup_tag+0x20/0x30
Nov 27 04:41:54 core kernel: [1242602.033893]  [<ffffffff810da835>] 
wait_on_page_writeback_range+0xf5/0x190
Nov 27 04:41:54 core kernel: [1242602.033899]  [<ffffffff811ee9a9>] ? 
jbd2_journal_file_buffer+0x59/0x80
Nov 27 04:41:54 core kernel: [1242602.033903]  [<ffffffff810da8f7>] 
filemap_fdatawait+0x27/0x30
Nov 27 04:41:54 core kernel: [1242602.033907]  [<ffffffff811ef896>] 
journal_finish_inode_data_buffers+0x56/0x150
Nov 27 04:41:54 core kernel: [1242602.033911]  [<ffffffff811f03b6>] 
jbd2_journal_commit_transaction+0x6d6/0x1100
Nov 27 04:41:54 core kernel: [1242602.033917]  [<ffffffff811f5e33>] 
kjournald2+0x103/0x270
Nov 27 04:41:54 core kernel: [1242602.033921]  [<ffffffff81078570>] ? 
autoremove_wake_function+0x0/0x40
Nov 27 04:41:54 core kernel: [1242602.033926]  [<ffffffff811f5d30>] ? 
kjournald2+0x0/0x270
Nov 27 04:41:54 core kernel: [1242602.033929]  [<ffffffff81078186>] 
kthread+0xa6/0xb0
Nov 27 04:41:54 core kernel: [1242602.033935]  [<ffffffff8101312a>] 
child_rip+0xa/0x20
Nov 27 04:41:54 core kernel: [1242602.033939]  [<ffffffff810780e0>] ? 
kthread+0x0/0xb0
Nov 27 04:41:54 core kernel: [1242602.033942]  [<ffffffff81013120>] ? 
child_rip+0x0/0x20
Nov 27 04:41:54 core kernel: [1242602.033960] INFO: task bash:13216 blocked for 
more than 120 seconds.
Nov 27 04:41:54 core kernel: [1242602.033970] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Nov 27 04:41:54 core kernel: [1242602.034014] bash          D 0000000000000000  
   0 13216  13215 0x00000000
Nov 27 04:41:54 core kernel: [1242602.034019]  ffff88009853d818 
0000000000000086 ffff88009853d7a8 0000000000015880
Nov 27 04:41:54 core kernel: [1242602.034025]  ffff88008fa8de70 
0000000000015880 0000000000015880 0000000000015880
Nov 27 04:41:54 core kernel: [1242602.034030]  0000000000015880 
ffff88008fa8de70 0000000000015880 0000000000015880
Nov 27 04:41:54 core kernel: [1242602.034035] Call Trace:
Nov 27 04:41:54 core kernel: [1242602.034040]  [<ffffffff81529cd8>] 
io_schedule+0x28/0x40
Nov 27 04:41:54 core kernel: [1242602.034045]  [<ffffffff812664c7>] 
get_request_wait+0xc7/0x1a0
Nov 27 04:41:54 core kernel: [1242602.034049]  [<ffffffff81078570>] ? 
autoremove_wake_function+0x0/0x40
Nov 27 04:41:54 core kernel: [1242602.034054]  [<ffffffff8125b33b>] ? 
elv_merge+0x1cb/0x200
Nov 27 04:41:54 core kernel: [1242602.034058]  [<ffffffff81266633>] 
__make_request+0x93/0x440
Nov 27 04:41:54 core kernel: [1242602.034062]  [<ffffffff81114aba>] ? 
__slab_alloc+0x8a/0x2d0
Nov 27 04:41:54 core kernel: [1242602.034066]  [<ffffffff8126515b>] 
generic_make_request+0x19b/0x4c0
Nov 27 04:41:54 core kernel: [1242602.034070]  [<ffffffff810dc6f0>] ? 
mempool_alloc_slab+0x10/0x20
Nov 27 04:41:54 core kernel: [1242602.034076]  [<ffffffff81144f64>] ? 
alloc_buffer_head+0x44/0x50
Nov 27 04:41:54 core kernel: [1242602.034080]  [<ffffffff812654fd>] 
submit_bio+0x7d/0x110
Nov 27 04:41:54 core kernel: [1242602.034084]  [<ffffffff81145452>] 
submit_bh+0xf2/0x130
Nov 27 04:41:54 core kernel: [1242602.034088]  [<ffffffff81146e63>] 
ll_rw_block+0x123/0x130
Nov 27 04:41:54 core kernel: [1242602.034092]  [<ffffffff81146e99>] 
__breadahead+0x29/0x40
Nov 27 04:41:54 core kernel: [1242602.034097]  [<ffffffff811b3a6e>] 
__ext4_get_inode_loc+0x32e/0x3b0
Nov 27 04:41:54 core kernel: [1242602.034101]  [<ffffffff811b3b6e>] 
ext4_iget+0x7e/0x7f0
Nov 27 04:41:54 core kernel: [1242602.034105]  [<ffffffff8152b9a9>] ? 
_spin_lock+0x9/0x10
Nov 27 04:41:54 core kernel: [1242602.034110]  [<ffffffff811bbee5>] 
ext4_lookup+0xa5/0x130
Nov 27 04:41:54 core kernel: [1242602.034115]  [<ffffffff81128b3a>] 
real_lookup+0xda/0x150
Nov 27 04:41:54 core kernel: [1242602.034119]  [<ffffffff8112a930>] 
do_lookup+0xb0/0xe0
Nov 27 04:41:54 core kernel: [1242602.034123]  [<ffffffff8112b344>] 
__link_path_walk+0x674/0xdb0
Nov 27 04:41:54 core kernel: [1242602.034127]  [<ffffffff811ba3d3>] ? 
dx_release+0x23/0x50
Nov 27 04:41:54 core kernel: [1242602.034131]  [<ffffffff8112bc67>] 
path_walk+0x57/0xb0
Nov 27 04:41:54 core kernel: [1242602.034135]  [<ffffffff8112bdf3>] 
do_path_lookup+0x53/0xa0
Nov 27 04:41:54 core kernel: [1242602.034140]  [<ffffffff8112ca92>] 
user_path_at+0x52/0xa0
Nov 27 04:41:54 core kernel: [1242602.034145]  [<ffffffff811ad713>] ? 
ext4_readdir+0x83/0x4a0
Nov 27 04:41:54 core kernel: [1242602.034149]  [<ffffffff8152b9a9>] ? 
_spin_lock+0x9/0x10

-- 
Idle-priority scheduling bug blocks tasks
https://bugs.launchpad.net/bugs/276476
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