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SubjectRe: regression: 100% io-wait with 2.6.24-rcX
Date
Am Montag, 7. Januar 2008 schrieb Ingo Molnar:

> do:
>
> echo t > /proc/sysrq-trigger
>
> and send us the dmesg output. If the dmesg output does not include the
> bootup bits then increase CONFIG_LOG_BUF_SHIFT to 20 or so:
>
> CONFIG_LOG_BUF_SHIFT=20
>
> to have a large enough kernel messages buffer.

The buffer was too small, hence I copied the relevant parts
of /var/log/kern.log, I hope it contains all required information as well.

regards,
Jörg
kernel: f509eb84 f50dc700 f50f3be4 00000246 f50f3be4 f5c37b80 c01672ef
kernel: Call Trace:
kernel: [<c0271f11>] schedule_timeout+0x13/0x8b
kernel: [<c01672ef>] pipe_poll+0x24/0x7f
kernel: [<c016d53f>] do_select+0x370/0x3b9
kernel: [<c016daf0>] __pollwait+0x0/0xa9
kernel: [<c0118a51>] default_wake_function+0x0/0x5
last message repeated 4 times
kernel: [<c0146ba7>] __rmqueue+0x14/0x196
kernel: [<c01169ce>] enqueue_entity+0x2b/0x3d
kernel: [<c01169f6>] enqueue_task_fair+0x16/0x24
kernel: [<c011642e>] enqueue_task+0x3f/0x4a
kernel: [<c01162b8>] __wake_up_common+0x31/0x56
kernel: [<c015e1ef>] __slab_free+0x5b/0x279
kernel: [<c0215e3a>] __kfree_skb+0x8/0x63
kernel: [<c0214a2c>] sock_wfree+0x20/0x34
kernel: [<c0216521>] skb_release_all+0xa1/0xf6
kernel: [<f8892813>] unix_stream_recvmsg+0x3e9/0x4d6 [unix]
kernel: [<c016d774>] core_sys_select+0x1ec/0x282
kernel: [<c0210d34>] sock_aio_read+0xf2/0xfa
kernel: [<c0123d9a>] recalc_sigpending+0xa/0x2d
kernel: [<c0162077>] do_sync_read+0xc6/0x109
kernel: [<c012be2b>] autoremove_wake_function+0x0/0x33
kernel: [<f88929a4>] unix_ioctl+0xa4/0xac [unix]
kernel: [<c0210adb>] sock_ioctl+0x1b2/0x1d7
kernel: [<c016dc39>] sys_select+0xa0/0x167
kernel: [<c0103d7a>] sysenter_past_esp+0x5f/0x85
kernel: [<c0270000>] netlbl_unlabel_list+0x9f/0x1bf
kernel: =======================
kernel: bash R running 0 8034 7712
kernel: bash S 000000fd 0 8062 7713
kernel: dfcc0a80 00000082 12210264 000000fd f537ace0 01366da4 00000000 7fffffff
kernel: dfc77000 00000001 bf9130cf c0271f11 f78127b0 00000000 f535ffb8 f535ff90
kernel: f537b034 00000000 bf9130cf f535ffb8 f535f000 c010348a 00000000 080c5c60
kernel: Call Trace:
kernel: [<c0271f11>] schedule_timeout+0x13/0x8b
kernel: [<c010348a>] do_notify_resume+0x81/0x5f6
kernel: [<c01f014b>] read_chan+0x2fc/0x521
kernel: [<c0118a51>] default_wake_function+0x0/0x5
kernel: [<c01efe4f>] read_chan+0x0/0x521
kernel: [<c01ed351>] tty_read+0x6f/0xad
kernel: [<c01ed2e2>] tty_read+0x0/0xad
kernel: [<c01628e5>] vfs_read+0x9f/0x149
kernel: [<c0162c74>] sys_read+0x41/0x67
kernel: [<c0103d7a>] sysenter_past_esp+0x5f/0x85
kernel: =======================
kernel: kwalletmanage S 00000648 0 8371 1
kernel: f4128600 00200086 fcf08470 00000648 f52fd860 0006eb74 00000000 7fffffff
kernel: f407a500 00000400 f4176f4c c0271f11 f414b200 00000000 00000000 00200200
kernel: 0016e496 c0123251 f4123e00 f4176be4 00200246 f4176be4 f407a500 001672ef
kernel: Call Trace:
kernel: [<c0271f11>] schedule_timeout+0x13/0x8b
kernel: [<c0123251>] process_timeout+0x0/0x5
kernel: [<c016d53f>] do_select+0x370/0x3b9
kernel: [<c016daf0>] __pollwait+0x0/0xa9
kernel: [<c0118a51>] default_wake_function+0x0/0x5
last message repeated 4 times
kernel: [<c01abd85>] elv_insert+0xa6/0x146
kernel: [<c01169ce>] enqueue_entity+0x2b/0x3d
kernel: [<c01169f6>] enqueue_task_fair+0x16/0x24
kernel: [<c011642e>] enqueue_task+0x3f/0x4a
kernel: [<c01169ce>] enqueue_entity+0x2b/0x3d
kernel: [<c01169f6>] enqueue_task_fair+0x16/0x24
kernel: [<c011642e>] enqueue_task+0x3f/0x4a
kernel: [<c01162b8>] __wake_up_common+0x31/0x56
kernel: [<c02131ab>] sock_alloc_send_skb+0x7c/0x193
kernel: [<c01162b8>] __wake_up_common+0x31/0x56
kernel: [<c021474d>] sock_def_readable+0x31/0x6b
kernel: [<f8892c62>] unix_stream_sendmsg+0x263/0x32c [unix]
kernel: [<c016d774>] core_sys_select+0x1ec/0x282
kernel: [<c0210c3a>] sock_aio_write+0xe0/0xe8
kernel: [<c01681c4>] pipe_read+0x32c/0x338
kernel: [<c0161f6e>] do_sync_write+0xc6/0x109
kernel: [<c012be2b>] autoremove_wake_function+0x0/0x33
kernel: [<c01508b4>] free_pgtables+0x90/0xa0
kernel: [<f88929a4>] unix_ioctl+0xa4/0xac [unix]
kernel: [<c0210adb>] sock_ioctl+0x1b2/0x1d7
kernel: [<c016dc39>] sys_select+0xa0/0x167
kernel: [<c0103d7a>] sysenter_past_esp+0x5f/0x85
kernel: =======================
kernel: kttsd S 00000655 0 8384 1
kernel: dfcc0900 00200086 af7cbb2c 00000655 f52bcce0 00044e4d 00000000 7fffffff
kernel: f4131180 00000400 f4050f4c c0271f11 c010478b f889407c 00000000 f4ba7000
kernel: f416a600 00000020 f4075c40 f4050be4 00200246 f4050be4 f4131180 c01672ef
kernel: Call Trace:
kernel: [<c0271f11>] schedule_timeout+0x13/0x8b
kernel: [<c010478b>] common_interrupt+0x23/0x28
kernel: [<c01672ef>] pipe_poll+0x24/0x7f
kernel: [<c016d53f>] do_select+0x370/0x3b9
kernel: [<c016daf0>] __pollwait+0x0/0xa9
kernel: [<c0118a51>] default_wake_function+0x0/0x5
last message repeated 4 times
kernel: [<c017e48d>] __getblk+0x14/0x1cd
kernel: [<c0160960>] get_unused_fd_flags+0x55/0xcb
kernel: [<f9a154ff>] ext3_getblk+0xb9/0x173 [ext3]
kernel: [<c0218cb7>] scm_detach_fds+0xec/0x125
kernel: [<c0218982>] __scm_destroy+0x23/0x38
kernel: [<c01169ce>] enqueue_entity+0x2b/0x3d
kernel: [<c01169f6>] enqueue_task_fair+0x16/0x24
kernel: [<c011642e>] enqueue_task+0x3f/0x4a
kernel: [<c01162b8>] __wake_up_common+0x31/0x56
kernel: [<f889357c>] unix_write_space+0x32/0x6a [unix]
kernel: [<c0214a2c>] sock_wfree+0x20/0x34
kernel: [<c0216521>] skb_release_all+0xa1/0xf6
kernel: [<f8892813>] unix_stream_recvmsg+0x3e9/0x4d6 [unix]
kernel: [<c016d774>] core_sys_select+0x1ec/0x282
kernel: [<c0210d34>] sock_aio_read+0xf2/0xfa
kernel: [<c0123d9a>] recalc_sigpending+0xa/0x2d
kernel: [<c0162077>] do_sync_read+0xc6/0x109
kernel: [<c012be2b>] autoremove_wake_function+0x0/0x33
kernel: [<f88929a4>] unix_ioctl+0xa4/0xac [unix]
kernel: [<c0210adb>] sock_ioctl+0x1b2/0x1d7
kernel: [<c016dc39>] sys_select+0xa0/0x167
kernel: [<c0103d7a>] sysenter_past_esp+0x5f/0x85
kernel: [<c0270000>] netlbl_unlabel_list+0x9f/0x1bf
kernel: =======================
kernel: konqueror S 00000648 0 8665 7259
kernel: f40fb000 00000086 fa0dc86a 00000648 f418d2a0 00003d78 00000000 7fffffff
kernel: f5049c80 00000800 f41b5f4c c0271f11 00000200 f41b5f4c 00000000 00200200
kernel: 0016a41f c0123251 f5cf31c0 00000246 f5cf31c0 f41b5be4 f889106f 001672ef
kernel: Call Trace:
kernel: [<c0271f11>] schedule_timeout+0x13/0x8b
kernel: [<c0123251>] process_timeout+0x0/0x5
kernel: [<f889106f>] unix_poll+0x17/0x8b [unix]
kernel: [<c016d53f>] do_select+0x370/0x3b9
kernel: [<c016daf0>] __pollwait+0x0/0xa9
kernel: [<c0118a51>] default_wake_function+0x0/0x5
last message repeated 4 times
kernel: [<c017e46f>] __find_get_block+0x13d/0x147
kernel: [<c01169ce>] enqueue_entity+0x2b/0x3d
kernel: [<c017e76b>] __set_page_dirty+0x125/0x132
kernel: [<c01169ce>] enqueue_entity+0x2b/0x3d
kernel: [<c01169f6>] enqueue_task_fair+0x16/0x24
kernel: [<c011642e>] enqueue_task+0x3f/0x4a
kernel: [<c01162b8>] __wake_up_common+0x31/0x56
kernel: [<f88927ca>] unix_stream_recvmsg+0x3a0/0x4d6 [unix]
kernel: [<c0214a2c>] sock_wfree+0x20/0x34
kernel: [<f88927ca>] unix_stream_recvmsg+0x3a0/0x4d6 [unix]
kernel: [<f88927ca>] unix_stream_recvmsg+0x3a0/0x4d6 [unix]
kernel: [<f8892813>] unix_stream_recvmsg+0x3e9/0x4d6 [unix]
kernel: [<c016d774>] core_sys_select+0x1ec/0x282
kernel: [<c0210d34>] sock_aio_read+0xf2/0xfa
kernel: [<c0162077>] do_sync_read+0xc6/0x109
kernel: [<c012be2b>] autoremove_wake_function+0x0/0x33
kernel: [<c0150079>] handle_mm_fault+0x268/0x57d
kernel: [<f88929a4>] unix_ioctl+0xa4/0xac [unix]
kernel: [<c0210adb>] sock_ioctl+0x1b2/0x1d7
kernel: [<c016dc39>] sys_select+0xa0/0x167
kernel: [<c0103d7a>] sysenter_past_esp+0x5f/0x85
kernel: [<c0270000>] netlbl_unlabel_list+0x9f/0x1bf
kernel: =======================
kernel: kio_file S 00000195 0 10548 7259
kernel: f52e0d80 00000082 97e3a48e 00000195 f5032160 00000000 00000000 7fffffff
kernel: f4099380 00000020 f509af4c c0271f11 00000000 00000000 00000000 00000000
kernel: 00000000 00000000 f66b1a80 00000246 f66b1a80 f509abe4 f889106f 0009abe4
kernel: Call Trace:
kernel: [<c0271f11>] schedule_timeout+0x13/0x8b
kernel: [<f889106f>] unix_poll+0x17/0x8b [unix]
kernel: [<c016d53f>] do_select+0x370/0x3b9
kernel: [<c016daf0>] __pollwait+0x0/0xa9
kernel: [<c0118a51>] default_wake_function+0x0/0x5
kernel: [<c0147e3f>] __alloc_pages+0x5d/0x2d9
kernel: [<c0146ba7>] __rmqueue+0x14/0x196
kernel: [<c01169ce>] enqueue_entity+0x2b/0x3d
kernel: [<c01169f6>] enqueue_task_fair+0x16/0x24
kernel: [<c011642e>] enqueue_task+0x3f/0x4a
kernel: [<c01162b8>] __wake_up_common+0x31/0x56
kernel: [<c02131ab>] sock_alloc_send_skb+0x7c/0x193
kernel: [<c01162b8>] __wake_up_common+0x31/0x56
kernel: [<c021474d>] sock_def_readable+0x31/0x6b
kernel: [<f8892c62>] unix_stream_sendmsg+0x263/0x32c [unix]
kernel: [<c016d774>] core_sys_select+0x1ec/0x282
kernel: [<c0210c3a>] sock_aio_write+0xe0/0xe8
kernel: [<c0161f6e>] do_sync_write+0xc6/0x109
kernel: [<c012be2b>] autoremove_wake_function+0x0/0x33
kernel: [<c014fffc>] handle_mm_fault+0x1eb/0x57d
kernel: [<c016dc39>] sys_select+0xa0/0x167
kernel: [<c0162cdb>] sys_write+0x41/0x67
kernel: [<c0103d7a>] sysenter_past_esp+0x5f/0x85
kernel: =======================
kernel: pdflush D f41c2f14 0 18822 2
kernel: f673f000 00000046 00000286 f41c2f14 f5194ce0 00000286 00000286 f41c2f14
kernel: 00175279 f41c2f6c 00000000 c0271f6c f5ff363c f5ff3644 c0354a90 c0354a90
kernel: 00175279 c0123251 f5194b80 c03546c0 c0271f67 6c666470 00687375 00000000
kernel: Call Trace:
kernel: [<c0271f6c>] schedule_timeout+0x6e/0x8b
kernel: [<c0123251>] process_timeout+0x0/0x5
kernel: [<c0271f67>] schedule_timeout+0x69/0x8b
kernel: [<c027179a>] __sched_text_start+0x3a/0x70
kernel: [<c014d34b>] congestion_wait+0x4e/0x62
kernel: [<c012be2b>] autoremove_wake_function+0x0/0x33
kernel: [<c014971e>] pdflush+0x0/0x1bf
kernel: [<c01493c6>] wb_kupdate+0x8c/0xd1
kernel: [<c014971e>] pdflush+0x0/0x1bf
kernel: [<c0149839>] pdflush+0x11b/0x1bf
kernel: [<c014933a>] wb_kupdate+0x0/0xd1
kernel: [<c012bd71>] kthread+0x36/0x5d
kernel: [<c012bd3b>] kthread+0x0/0x5d
kernel: [<c010493b>] kernel_thread_helper+0x7/0x10
kernel: =======================
kernel: Sched Debug Version: v0.07, 2.6.24-rc7 #1
kernel: now at 5394978.742321 msecs
kernel: .sysctl_sched_latency : 20.000000
kernel: .sysctl_sched_min_granularity : 4.000000
kernel: .sysctl_sched_wakeup_granularity : 10.000000
kernel: .sysctl_sched_batch_wakeup_granularity : 10.000000
kernel: .sysctl_sched_child_runs_first : 0.000001
kernel: .sysctl_sched_features : 7
kernel:
kernel: cpu#0, 599.501 MHz
kernel: .nr_running : 3
kernel: .load : 11596
kernel: .nr_switches : 3472897
kernel: .nr_load_updates : 789297
kernel: .nr_uninterruptible : 1
kernel: .jiffies : 1528423
kernel: .next_balance : 0.000000
kernel: .curr->pid : 8034
kernel: .clock : 6967153.202929
kernel: .idle_clock : 4447303.677171
kernel: .prev_clock_raw : 4676606.867330
kernel: .clock_warps : 103
kernel: .clock_overflows : 4982682
kernel: .clock_deep_idle_events : 944576
kernel: .clock_max_delta : 3.333116
kernel: .cpu_load[0] : 11596
kernel: .cpu_load[1] : 5798
kernel: .cpu_load[2] : 2899
kernel: .cpu_load[3] : 1450
kernel: .cpu_load[4] : 744
kernel:
kernel: cfs_rq
kernel: .exec_clock : 0.000000
kernel: .MIN_vruntime : 0.000001
kernel: .min_vruntime : 616382.544882
kernel: .max_vruntime : 0.000001
kernel: .spread : 0.000000
kernel: .spread0 : 0.000000
kernel: .nr_running : 1
kernel: .load : 2048
kernel: .nr_spread_over : 0
kernel:
kernel: cfs_rq
kernel: .exec_clock : 0.000000
kernel: .MIN_vruntime : 0.000001
kernel: .min_vruntime : 616382.544882
kernel: .max_vruntime : 0.000001
kernel: .spread : 0.000000
kernel: .spread0 : 0.000000
kernel: .nr_running : 0
kernel: .load : 0
kernel: .nr_spread_over : 0
kernel:
kernel: cfs_rq
kernel: .exec_clock : 0.000000
kernel: .MIN_vruntime : 0.000001
kernel: .min_vruntime : 616382.544882
kernel: .max_vruntime : 0.000001
kernel: .spread : 0.000000
kernel: .spread0 : 0.000000
kernel: .nr_running : 0
kernel: .load : 0
kernel: .nr_spread_over : 0
kernel:
kernel: cfs_rq
kernel: .exec_clock : 0.000000
kernel: .MIN_vruntime : 0.000001
kernel: .min_vruntime : 616382.544882
kernel: .max_vruntime : 0.000001
kernel: .spread : 0.000000
kernel: .spread0 : 0.000000
kernel: .nr_running : 0
kernel: .load : 0
kernel: .nr_spread_over : 0
kernel:
kernel: cfs_rq
kernel: .exec_clock : 0.000000
kernel: .MIN_vruntime : 0.000001
kernel: .min_vruntime : 616382.544882
kernel: .max_vruntime : 0.000001
kernel: .spread : 0.000000
kernel: .spread0 : 0.000000
kernel: .nr_running : 0
kernel: .load : 0
kernel: .nr_spread_over : 0
kernel:
kernel: cfs_rq
kernel: .exec_clock : 0.000000
kernel: .MIN_vruntime : 0.000001
kernel: .min_vruntime : 616382.544882
kernel: .max_vruntime : 0.000001
kernel: .spread : 0.000000
kernel: .spread0 : 0.000000
kernel: .nr_running : 0
kernel: .load : 0
kernel: .nr_spread_over : 0
kernel:
kernel: cfs_rq
kernel: .exec_clock : 0.000000
kernel: .MIN_vruntime : 0.000001
kernel: .min_vruntime : 616382.544882
kernel: .max_vruntime : 0.000001
kernel: .spread : 0.000000
kernel: .spread0 : 0.000000
kernel: .nr_running : 0
kernel: .load : 0
kernel: .nr_spread_over : 0
kernel:
kernel: cfs_rq
kernel: .exec_clock : 0.000000
kernel: .MIN_vruntime : 0.000001
kernel: .min_vruntime : 616382.544882
kernel: .max_vruntime : 0.000001
kernel: .spread : 0.000000
kernel: .spread0 : 0.000000
kernel: .nr_running : 0
kernel: .load : 0
kernel: .nr_spread_over : 0
kernel:
kernel: cfs_rq
kernel: .exec_clock : 0.000000
kernel: .MIN_vruntime : 0.000001
kernel: .min_vruntime : 616382.544882
kernel: .max_vruntime : 0.000001
kernel: .spread : 0.000000
kernel: .spread0 : 0.000000
kernel: .nr_running : 0
kernel: .load : 0
kernel: .nr_spread_over : 0
kernel:
kernel: cfs_rq
kernel: .exec_clock : 0.000000
kernel: .MIN_vruntime : 0.000001
kernel: .min_vruntime : 616382.544882
kernel: .max_vruntime : 0.000001
kernel: .spread : 0.000000
kernel: .spread0 : 0.000000
kernel: .nr_running : 0
kernel: .load : 0
kernel: .nr_spread_over : 0
kernel:
kernel: cfs_rq
kernel: .exec_clock : 0.000000
kernel: .MIN_vruntime : 214548.087264
kernel: .min_vruntime : 616382.544882
kernel: .max_vruntime : 214549.007330
kernel: .spread : 0.920066
kernel: .spread0 : 0.000000
kernel: .nr_running : 3
kernel: .load : 11596
kernel: .nr_spread_over : 0
kernel:
kernel: runnable tasks:
kernel: task PID tree-key switches prio exec-runtime sum-exec sum-sleep
kernel: ----------------------------------------------------------------------------------------------------------
kernel: klogd 4715 214548.087264 4266 120 0 0 0.000000 0.000000 0.000000
kernel: Xorg 5872 214549.007330 983644 110 0 0 0.000000 0.000000 0.000000
kernel: R bash 8034 214548.926777 1418 120 0 0 0.000000 0.000000 0.000000
kernel:
\
 
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