hi all, using 2.6.31.1 with CONFIG_PREEMPT=y, i got the following call traces from ext4 related code, when doing some io-heavy tasks: [30477.126201] INFO: task gconfd-2:2296 blocked for more than 120 seconds. [30477.126205] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [30477.126208] gconfd-2 D ffff8800280436e8 0 2296 1 0x00000000 [30477.126214] BUG: using smp_processor_id() in preemptible [00000000] code: khungtaskd/72 [30477.126221] caller is show_stack_log_lvl+0x32/0x170 [30477.126224] Pid: 72, comm: khungtaskd Tainted: P 2.6.31.1 #29 [30477.126227] Call Trace: [30477.126234] [<ffffffff81266881>] debug_smp_processor_id+0xd1/0xf0 [30477.126238] [<ffffffff81014b62>] show_stack_log_lvl+0x32/0x170 [30477.126242] [<ffffffff814f57c0>] ? printk+0x3c/0x44 [30477.126246] [<ffffffff81015e17>] show_stack+0x17/0x20 [30477.126251] [<ffffffff81045b52>] sched_show_task+0x92/0x100 [30477.126256] [<ffffffff810ab66d>] watchdog+0x1fd/0x240 [30477.126260] [<ffffffff810ab470>] ? watchdog+0x0/0x240 [30477.126264] [<ffffffff81071216>] kthread+0xa6/0xb0 [30477.126268] [<ffffffff8101303a>] child_rip+0xa/0x20 [30477.126272] [<ffffffff81071170>] ? kthread+0x0/0xb0 [30477.126275] [<ffffffff81013030>] ? child_rip+0x0/0x20 [30477.126278] ffff8803331afc98 0000000000000086 0000000000000000 0000000000000000 [30477.126282] ffff8803331afc58 0000000000000000 ffff8803331afc58 00000001002ddc13 [30477.126287] 000000000000f6e8 00000000000147c0 ffff880331d3acb8 ffff880331d3acb8 [30477.126291] Call Trace: [30477.126298] [<ffffffff811de775>] jbd2_log_wait_commit+0xb5/0x130 [30477.126303] [<ffffffff81071660>] ? autoremove_wake_function+0x0/0x40 [30477.126307] [<ffffffff81074b51>] ? ktime_get_ts+0x51/0x70 [30477.126311] [<ffffffff811d6300>] jbd2_journal_stop+0x1e0/0x2b0 [30477.126315] [<ffffffff811d6cbe>] ? jbd2_journal_start+0xae/0x100 [30477.126319] [<ffffffff811d6d32>] jbd2_journal_force_commit+0x22/0x30 [30477.126325] [<ffffffff811ae9f2>] ext4_force_commit+0x22/0x40 [30477.126329] [<ffffffff8119c004>] ext4_write_inode+0x34/0x50 [30477.126335] [<ffffffff8112b79c>] writeback_single_inode+0x2bc/0x420 [30477.126339] [<ffffffff8112b92e>] sync_inode+0x2e/0x50 [30477.126343] [<ffffffff81199220>] ext4_sync_file+0x100/0x1c0 [30477.126348] [<ffffffff810db128>] ? do_writepages+0x28/0x50 [30477.126352] [<ffffffff8112faf6>] vfs_fsync+0x86/0xf0 [30477.126356] [<ffffffff8112fb99>] do_fsync+0x39/0x60 [30477.126360] [<ffffffff8112fbeb>] sys_fsync+0xb/0x10 [30477.126365] [<ffffffff81011f42>] system_call_fastpath+0x16/0x1b [30477.126374] INFO: task firefox:4898 blocked for more than 120 seconds. [30477.126376] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [30477.126378] firefox D ffff8800280d46e8 0 4898 1 0x00000000 [30477.126383] BUG: using smp_processor_id() in preemptible [00000000] code: khungtaskd/72 [30477.126386] caller is show_stack_log_lvl+0x32/0x170 [30477.126389] Pid: 72, comm: khungtaskd Tainted: P 2.6.31.1 #29 [30477.126391] Call Trace: [30477.126394] [<ffffffff81266881>] debug_smp_processor_id+0xd1/0xf0 [30477.126398] [<ffffffff81014b62>] show_stack_log_lvl+0x32/0x170 [30477.126401] [<ffffffff814f57c0>] ? printk+0x3c/0x44 [30477.126405] [<ffffffff81015e17>] show_stack+0x17/0x20 [30477.126408] [<ffffffff81045b52>] sched_show_task+0x92/0x100 [30477.126412] [<ffffffff810ab66d>] watchdog+0x1fd/0x240 [30477.126415] [<ffffffff810ab470>] ? watchdog+0x0/0x240 [30477.126419] [<ffffffff81071216>] kthread+0xa6/0xb0 [30477.126422] [<ffffffff8101303a>] child_rip+0xa/0x20 [30477.126426] [<ffffffff81071170>] ? kthread+0x0/0xb0 [30477.126429] [<ffffffff81013030>] ? child_rip+0x0/0x20 [30477.126431] ffff880309409ac8 0000000000000082 0000000000000000 0000000000000286 [30477.126435] ffff88012547fc78 0000000000000005 ffff8803309cf000 00000001002dc21f [30477.126440] 000000000000f6e8 00000000000147c0 ffff88030954c438 ffff88030954c438 [30477.126444] Call Trace: [30477.126448] [<ffffffff811d7255>] do_get_write_access+0x365/0x6d0 [30477.126453] [<ffffffff810716a0>] ? wake_bit_function+0x0/0x40 [30477.126456] [<ffffffff811e1437>] ? jbd2_journal_add_journal_head+0x117/0x220 [30477.126461] [<ffffffff811d77dc>] jbd2_journal_get_write_access+0x2c/0x50 [30477.126466] [<ffffffff811bf700>] __ext4_journal_get_write_access+0x30/0x70 [30477.126470] [<ffffffff811a3f31>] ext4_orphan_add+0xc1/0x1d0 [30477.126474] [<ffffffff811d6cbe>] ? jbd2_journal_start+0xae/0x100 [30477.126479] [<ffffffff814f8737>] ? _spin_unlock_irq+0x17/0x40 [30477.126483] [<ffffffff8119dd9a>] ext4_setattr+0x22a/0x360 [30477.126488] [<ffffffff811229c3>] notify_change+0x163/0x340 [30477.126493] [<ffffffff8110aae9>] do_truncate+0x69/0x90 [30477.126496] [<ffffffff81114edc>] ? get_write_access+0x3c/0x60 [30477.126500] [<ffffffff81115616>] may_open+0x1d6/0x200 [30477.126503] [<ffffffff811184e8>] do_filp_open+0x208/0xb50 [30477.126508] [<ffffffff814f81f6>] ? _spin_lock+0x16/0x40 [30477.126511] [<ffffffff811238f2>] ? alloc_fd+0xf2/0x140 [30477.126515] [<ffffffff81109b84>] do_sys_open+0x64/0x130 [30477.126518] [<ffffffff81109c7b>] sys_open+0x1b/0x20 [30477.126522] [<ffffffff81011f42>] system_call_fastpath+0x16/0x1b [30477.126530] INFO: task thunderbird-bin:12190 blocked for more than 120 seconds. [30477.126532] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [30477.126534] thunderbird-b D ffff8800280436e8 0 12190 12186 0x00000000 [30477.126539] BUG: using smp_processor_id() in preemptible [00000000] code: khungtaskd/72 [30477.126542] caller is show_stack_log_lvl+0x32/0x170 [30477.126545] Pid: 72, comm: khungtaskd Tainted: P 2.6.31.1 #29 [30477.126546] Call Trace: [30477.126550] [<ffffffff81266881>] debug_smp_processor_id+0xd1/0xf0 [30477.126553] [<ffffffff81014b62>] show_stack_log_lvl+0x32/0x170 [30477.126556] [<ffffffff814f57c0>] ? printk+0x3c/0x44 [30477.126560] [<ffffffff81015e17>] show_stack+0x17/0x20 [30477.126563] [<ffffffff81045b52>] sched_show_task+0x92/0x100 [30477.126567] [<ffffffff810ab66d>] watchdog+0x1fd/0x240 [30477.126570] [<ffffffff810ab470>] ? watchdog+0x0/0x240 [30477.126574] [<ffffffff81071216>] kthread+0xa6/0xb0 [30477.126577] [<ffffffff8101303a>] child_rip+0xa/0x20 [30477.126581] [<ffffffff81071170>] ? kthread+0x0/0xb0 [30477.126584] [<ffffffff81013030>] ? child_rip+0x0/0x20 [30477.126586] ffff8803031c3a68 0000000000000082 0000000000000000 ffffea000b023168 [30477.126590] 00000000001800f2 0000000000000000 ffff880333713800 00000001002dba15 [30477.126594] 000000000000f6e8 00000000000147c0 ffff8803031c0938 ffff8803031c0938 [30477.126598] Call Trace: [30477.126603] [<ffffffff811d7255>] do_get_write_access+0x365/0x6d0 [30477.126607] [<ffffffff810716a0>] ? wake_bit_function+0x0/0x40 [30477.126611] [<ffffffff811e1437>] ? jbd2_journal_add_journal_head+0x117/0x220 [30477.126615] [<ffffffff811d77dc>] jbd2_journal_get_write_access+0x2c/0x50 [30477.126619] [<ffffffff811bf700>] __ext4_journal_get_write_access+0x30/0x70 [30477.126624] [<ffffffff8119d7cb>] ext4_reserve_inode_write+0x7b/0xa0 [30477.126628] [<ffffffff8119d82c>] ext4_mark_inode_dirty+0x3c/0x1c0 [30477.126632] [<ffffffff810d7cec>] ? T.1235+0xac/0xe0 [30477.126636] [<ffffffff8119db22>] ext4_dirty_inode+0x62/0xb0 [30477.126640] [<ffffffff8112c346>] __mark_inode_dirty+0x36/0x130 [30477.126644] [<ffffffff81120ae4>] touch_atime+0xf4/0x150 [30477.126649] [<ffffffff810d4590>] generic_file_aio_read+0x2a0/0x620 [30477.126654] [<ffffffff8110b9f2>] do_sync_read+0xf2/0x130 [30477.126658] [<ffffffff810dcc69>] ? __lru_cache_add+0x79/0xd0 [30477.126662] [<ffffffff814f8630>] ? _spin_unlock+0x10/0x40 [30477.126665] [<ffffffff81071660>] ? autoremove_wake_function+0x0/0x40 [30477.126670] [<ffffffff8110fd4f>] ? cp_new_stat+0xdf/0xf0 [30477.126674] [<ffffffff8120d991>] ? security_file_permission+0x11/0x20 [30477.126678] [<ffffffff8110be55>] vfs_read+0xb5/0x1a0 [30477.126682] [<ffffffff8110cedd>] ? fget_light+0x9d/0xb0 [30477.126685] [<ffffffff8110c49c>] sys_read+0x4c/0x80 [30477.126689] [<ffffffff81011f42>] system_call_fastpath+0x16/0x1b [30477.126693] INFO: task thunderbird-bin:12196 blocked for more than 120 seconds. [30477.126695] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [30477.126697] thunderbird-b D ffff8800280436e8 0 12196 12186 0x00000000 [30477.126702] BUG: using smp_processor_id() in preemptible [00000000] code: khungtaskd/72 [30477.126705] caller is show_stack_log_lvl+0x32/0x170 [30477.126708] Pid: 72, comm: khungtaskd Tainted: P 2.6.31.1 #29 [30477.126710] Call Trace: [30477.126713] [<ffffffff81266881>] debug_smp_processor_id+0xd1/0xf0 [30477.126716] [<ffffffff81014b62>] show_stack_log_lvl+0x32/0x170 [30477.126720] [<ffffffff814f57c0>] ? printk+0x3c/0x44 [30477.126723] [<ffffffff81015e17>] show_stack+0x17/0x20 [30477.126726] [<ffffffff81045b52>] sched_show_task+0x92/0x100 [30477.126730] [<ffffffff810ab66d>] watchdog+0x1fd/0x240 [30477.126734] [<ffffffff810ab470>] ? watchdog+0x0/0x240 [30477.126737] [<ffffffff81071216>] kthread+0xa6/0xb0 [30477.126740] [<ffffffff8101303a>] child_rip+0xa/0x20 [30477.126744] [<ffffffff81071170>] ? kthread+0x0/0xb0 [30477.126747] [<ffffffff81013030>] ? child_rip+0x0/0x20 [30477.126749] ffff8803031a1d68 0000000000000082 0000000000000000 ffff8803031a1e30 [30477.126753] 0000000000000000 0000000000000000 ffff8803031a1d78 00000001002dba15 [30477.126757] 000000000000f6e8 00000000000147c0 ffff8803031a4978 ffff8803031a4978 [30477.126761] Call Trace: [30477.126766] [<ffffffff811de775>] jbd2_log_wait_commit+0xb5/0x130 [30477.126770] [<ffffffff81071660>] ? autoremove_wake_function+0x0/0x40 [30477.126774] [<ffffffff811d6300>] jbd2_journal_stop+0x1e0/0x2b0 [30477.126778] [<ffffffff811d6cbe>] ? jbd2_journal_start+0xae/0x100 [30477.126782] [<ffffffff811d6d32>] jbd2_journal_force_commit+0x22/0x30 [30477.126786] [<ffffffff811ae9f2>] ext4_force_commit+0x22/0x40 [30477.126790] [<ffffffff811991a3>] ext4_sync_file+0x83/0x1c0 [30477.126856] [<ffffffff810db13d>] ? do_writepages+0x3d/0x50 [30477.126860] [<ffffffff810d3103>] ? __filemap_fdatawrite_range+0x53/0x60 [30477.126865] [<ffffffff8112faf6>] vfs_fsync+0x86/0xf0 [30477.126869] [<ffffffff8112fb99>] do_fsync+0x39/0x60 [30477.126873] [<ffffffff8112fbce>] sys_fdatasync+0xe/0x20 [30477.126877] [<ffffffff81011f42>] system_call_fastpath+0x16/0x1b [30477.126885] INFO: task java:14629 blocked for more than 120 seconds. [30477.126887] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [30477.126889] java D ffff8800280436e8 0 14629 1 0x00000004 [30477.126894] BUG: using smp_processor_id() in preemptible [00000000] code: khungtaskd/72 [30477.126898] caller is show_stack_log_lvl+0x32/0x170 [30477.126900] Pid: 72, comm: khungtaskd Tainted: P 2.6.31.1 #29 [30477.126902] Call Trace: [30477.126906] [<ffffffff81266881>] debug_smp_processor_id+0xd1/0xf0 [30477.126909] [<ffffffff81014b62>] show_stack_log_lvl+0x32/0x170 [30477.126912] [<ffffffff814f57c0>] ? printk+0x3c/0x44 [30477.126915] [<ffffffff81015e17>] show_stack+0x17/0x20 [30477.126919] [<ffffffff81045b52>] sched_show_task+0x92/0x100 [30477.126922] [<ffffffff810ab66d>] watchdog+0x1fd/0x240 [30477.126926] [<ffffffff810ab470>] ? watchdog+0x0/0x240 [30477.126929] [<ffffffff81071216>] kthread+0xa6/0xb0 [30477.126933] [<ffffffff8101303a>] child_rip+0xa/0x20 [30477.126937] [<ffffffff81071170>] ? kthread+0x0/0xb0 [30477.126940] [<ffffffff81013030>] ? child_rip+0x0/0x20 [30477.126942] ffff88026ec81c68 0000000000000086 0000000000000000 ffffffff811d7fb2 [30477.126946] ffff88026ec81cc8 0000000000000000 ffff88026ec81c18 00000001002dc64a [30477.126950] 000000000000f6e8 00000000000147c0 ffff8801571a88b8 ffff8801571a88b8 [30477.126954] Call Trace: [30477.126957] [<ffffffff811d7fb2>] ? jbd2_journal_dirty_metadata+0xb2/0x1e0 [30477.126962] [<ffffffff814f6f9b>] __mutex_lock_common+0x12b/0x270 [30477.126966] [<ffffffff8119d860>] ? ext4_mark_inode_dirty+0x70/0x1c0 [30477.126970] [<ffffffff814f70f4>] __mutex_lock_slowpath+0x14/0x20 [30477.126973] [<ffffffff814f6d8e>] mutex_lock+0x1e/0x40 [30477.126977] [<ffffffff811a3cf3>] ext4_orphan_del+0x53/0x1d0 [30477.126981] [<ffffffff814f81f6>] ? _spin_lock+0x16/0x40 [30477.126984] [<ffffffff814f8630>] ? _spin_unlock+0x10/0x40 [30477.126988] [<ffffffff8112c3a8>] ? __mark_inode_dirty+0x98/0x130 [30477.126992] [<ffffffff8119de9a>] ext4_setattr+0x32a/0x360 [30477.126996] [<ffffffff811229c3>] notify_change+0x163/0x340 [30477.126999] [<ffffffff81115770>] ? putname+0x30/0x50 [30477.127004] [<ffffffff81130087>] utimes_common+0xd7/0x1b0 [30477.127008] [<ffffffff811301f0>] do_utimes+0x90/0xf0 [30477.127012] [<ffffffff8113027b>] sys_futimesat+0x2b/0xb0 [30477.127016] [<ffffffff81130314>] sys_utimes+0x14/0x20 [30477.127020] [<ffffffff81011f42>] system_call_fastpath+0x16/0x1b hth, tim -- tim@xxxxxxxxxx http://tim.klingt.org You don't have to call it music if the term shocks you. John Cage
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