Bug#516374: Reply to #211
I don't think it's fixed in 2.6.32 (I'm using the one from backports)
I have webservers running Apache which reach very very high loads and the
server becomes completely unrensponsive through ssh, althoung ping (for
example) works.
This appears in the kernel log:
[ 1079.886691] INFO: task flush-8:0:1755 blocked for more than 120 seconds.
[ 1079.904075] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 1079.921842] flush-8:0 D 0000000000000000 0 1755 2 0x00000000
[ 1079.921846] ffff88022fa3b880 0000000000000046 0000000000000000
0000000000000002
[ 1079.921850] ffff88000540f9a0 000000000000f8a0 ffff88022ef65fd8
00000000000155c0
[ 1079.921852] 00000000000155c0 ffff88022e998710 ffff88022e998a08
0000000100000001
[ 1079.921855] Call Trace:
[ 1079.921863] [<ffffffff81178093>] ? get_request+0x7e/0x2ba
[ 1079.921869] [<ffffffff812edf7d>] ? io_schedule+0x73/0xb7
[ 1079.921871] [<ffffffff811783bf>] ? get_request_wait+0xf0/0x188
[ 1079.921875] [<ffffffff81064a36>] ? autoremove_wake_function+0x0/0x2e
[ 1079.921877] [<ffffffff8117874e>] ? __make_request+0x2f7/0x428
[ 1079.921883] [<ffffffff81176f2b>] ? generic_make_request+0x299/0x2f9
[ 1079.921886] [<ffffffff81177061>] ? submit_bio+0xd6/0xf2
[ 1079.921890] [<ffffffff8110b453>] ? submit_bh+0xf5/0x115
[ 1079.921894] [<ffffffff8110d9c4>] ? __block_write_full_page+0x1d6/0x2ac
[ 1079.921896] [<ffffffff8110c749>] ? end_buffer_async_write+0x0/0x13b
[ 1079.921901] [<ffffffff810b94e2>] ? __writepage+0xa/0x25
[ 1079.921904] [<ffffffff810b9b69>] ? write_cache_pages+0x20b/0x327
[ 1079.921907] [<ffffffff810b94d8>] ? __writepage+0x0/0x25
[ 1079.921912] [<ffffffff8103aa9c>] ? __wake_up_common+0x44/0x72
[ 1079.921917] [<ffffffff8103fa44>] ? __wake_up+0x30/0x44
[ 1079.921921] [<ffffffff8110637e>] ? writeback_single_inode+0xe7/0x2da
[ 1079.921925] [<ffffffff81107057>] ? writeback_inodes_wb+0x423/0x4fe
[ 1079.921928] [<ffffffff8110725e>] ? wb_writeback+0x12c/0x1ab
[ 1079.921934] [<ffffffff8105a4ba>] ? try_to_del_timer_sync+0x63/0x6c
[ 1079.921937] [<ffffffff811074c4>] ? wb_do_writeback+0x145/0x15b
[ 1079.921940] [<ffffffff8110750b>] ? bdi_writeback_task+0x31/0x9d
[ 1079.921944] [<ffffffff810c7c1e>] ? bdi_start_fn+0x0/0xca
[ 1079.921950] [<ffffffff810c7c8e>] ? bdi_start_fn+0x70/0xca
[ 1079.921953] [<ffffffff810c7c1e>] ? bdi_start_fn+0x0/0xca
[ 1079.921955] [<ffffffff81064769>] ? kthread+0x79/0x81
[ 1079.921959] [<ffffffff81011baa>] ? child_rip+0xa/0x20
[ 1079.921962] [<ffffffff810646f0>] ? kthread+0x0/0x81
[ 1079.921964] [<ffffffff81011ba0>] ? child_rip+0x0/0x20
--
Davide Ferrari
Atrapalo.com System Administrator
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