Re: 2.6.9: unkillable processes during heavy IO

Andrew Morton
2004-11-17T04:02:49Z

Brad Fitzpatrick <brad@danga.com> wrote:
>
> Here is the information requested regarding the regular lockup we're
> seeing (details in original post at bottom)

yup, that looks like a locking tangle in the XFS direct-io code.

Nathan, this is 2.6.9.

> # killall -9 mysqld
> # killall -9 mysqld
> # killall -9 mysqld
>
> PID WIDE-WCHAN-COLUMN COMMAND
> 1 - init [2]
> 2 migration_thread [migration/0]
> 3 ksoftirqd [ksoftirqd/0]
> 4 migration_thread [migration/1]
> 5 ksoftirqd [ksoftirqd/1]
> 6 worker_thread [events/0]
> 8 worker_thread \_ [khelper]
> 9 worker_thread \_ [kacpid]
> 39 worker_thread \_ [kblockd/0]
> 40 worker_thread \_ [kblockd/1]
> 52 pdflush \_ [pdflush]
> 53 pdflush \_ [pdflush]
> 56 worker_thread \_ [aio/0]
> 57 worker_thread \_ [aio/1]
> 7 worker_thread [events/1]
> 1154 worker_thread \_ [xfslogd/0]
> 1155 worker_thread \_ [xfslogd/1]
> 1156 worker_thread \_ [xfsdatad/0]
> 1157 worker_thread \_ [xfsdatad/1]
> 41 hub_thread [khubd]
> 54 kswapd [kswapd1]
> 55 kswapd [kswapd0]
> 639 serio_thread [kseriod]
> 726 - [scsi_eh_0]
> 733 - [scsi_eh_1]
> 1158 - [xfsbufd]
> 1159 1109149712136 [xfssyncd]
> 1160 1109149728520 [xfssyncd]
> 1161 kjournald [kjournald]
> 1162 1109157093128 [xfssyncd]
> 1163 1109157166856 [xfssyncd]
> 1164 1109172895496 [xfssyncd]
> 2931 - /sbin/syslogd
> 2934 syslog /sbin/klogd
> 2942 - /usr/sbin/inetd
> 3035 - /usr/lib/postfix/master
> 3040 - \_ qmgr -l -t fifo -u -c
> 8534 - \_ pickup -l -t fifo -u -c
> 3045 - /usr/sbin/snmpd -Lsd -Lf /dev/null -p /var/run/snmpd.pid
> 3051 - /usr/sbin/sshd
> 6952 - \_ sshd: root@pts/1
> 6954 - | \_ -bash
> 8569 - \_ sshd: root@pts/0
> 8571 wait \_ -bash
> 8671 - \_ ps afx -o pid,wchan=WIDE-WCHAN-COLUMN,command
> 3057 - /usr/sbin/atd
> 3060 - /usr/sbin/cron
> 3074 - /sbin/getty 38400 tty1
> 3076 - /sbin/getty 38400 tty2
> 3077 - /sbin/getty 38400 tty3
> 3078 - /sbin/getty 38400 tty4
> 3079 - /sbin/getty 38400 tty5
> 3080 - /sbin/getty 38400 tty6
> 5390 - /usr/local/mysql/bin/mysqld --defaults-extra-file=/usr/local/mysql/data/my.cnf --basedir=/usr/local/mysql/ --datadir=/data/mydb --user=root --pid-file=/var/run/mysqld/mysqld.pid --skip-locking --port=3306 --socket=/var/run/mysqld/mysqld.sock
> 7663 - /usr/local/mysql/bin/mysqld --defaults-extra-file=/usr/local/mysql/data/my.cnf --basedir=/usr/local/mysql/ --datadir=/data/mydb --user=root --pid-file=/var/run/mysqld/mysqld.pid --skip-locking --port=3306 --socket=/var/run/mysqld/mysqld.sock
> 8657 - /usr/local/mysql/bin/mysqld --defaults-extra-file=/usr/local/mysql/data/my.cnf --basedir=/usr/local/mysql/ --datadir=/data/mydb --user=root --pid-file=/var/run/mysqld/mysqld.pid --skip-locking --port=3306 --socket=/var/run/mysqld/mysqld.sock
> 8658 exit \_ [mysqld] <defunct>
>
>
> And sysrq t:
>
> SysRq : Show State
>
> sibling
> task PC pid father child younger older
> init S 0000000000000400 0 1 0 2 (NOTLB)
> 00000101450bdd88 0000000000000006 0000000000000256 0000010140000700
> 0000010140021480 0000000000000000 0000000000000007 ffffffff8015ae20
> 0000000000000216 0000000100000246
> Call Trace:<ffffffff8015ae20>{buffered_rmqueue+432} <ffffffff801417ef>{__mod_timer+303}
> <ffffffff8029c7ed>{schedule_timeout+173} <ffffffff801423c0>{process_timeout+0}
> <ffffffff8018bd33>{do_select+819} <ffffffff8018b840>{__pollwait+0}
> <ffffffff8018c170>{sys_select+960} <ffffffff8011195a>{system_call+126}
>
> migration/0 S 000001000c004720 0 2 1 3 (L-TLB)
> 000001000c03bee8 0000000000000046 0000010143860760 0000000000000012
> 0000007300000002 ffffffff801335c0 0000010211120810 0000000000000073
> 000001000c004740 0000000000000001
> Call Trace:<ffffffff801335c0>{try_to_wake_up+528} <ffffffff8013624a>{migration_thread+202}
> <ffffffff80136180>{migration_thread+0} <ffffffff8014de42>{kthread+146}
> <ffffffff801124ab>{child_rip+8} <ffffffff80136180>{migration_thread+0}
> <ffffffff8014ddb0>{kthread+0} <ffffffff801124a3>{child_rip+0}
>
> ksoftirqd/0 S 0000000000000000 0 3 1 4 2 (L-TLB)
> 000001023ff93f08 0000000000000046 0000000000000009 ffffffff804079e0
> 000000000000000a 0000000000000212 0000000000000212 0000000000000000
> 000001000c006940 00000000802f4e80
> Call Trace:<ffffffff8013deb1>{__do_softirq+113} <ffffffff8013e3a0>{ksoftirqd+0}
> <ffffffff8013e3df>{ksoftirqd+63} <ffffffff8014de42>{kthread+146}
> <ffffffff801124ab>{child_rip+8} <ffffffff8013e3a0>{ksoftirqd+0}
> <ffffffff8014ddb0>{kthread+0} <ffffffff801124a3>{child_rip+0}
>
> migration/1 S 00000101438619a0 0 4 1 5 3 (L-TLB)
> 000001023ff95ee8 0000000000000046 000001000c0034e0 0000000000000016
> 0000007300000002 ffffffff801335c0 0000010211120810 0000000000000073
> 00000101438619c0 0000000100000001
> Call Trace:<ffffffff801335c0>{try_to_wake_up+528} <ffffffff8013624a>{migration_thread+202}
> <ffffffff80136180>{migration_thread+0} <ffffffff8014de42>{kthread+146}
> <ffffffff801124ab>{child_rip+8} <ffffffff80136180>{migration_thread+0}
> <ffffffff8014ddb0>{kthread+0} <ffffffff801124a3>{child_rip+0}
>
> ksoftirqd/1 S 0000000000000000 0 5 1 6 4 (L-TLB)
> 000001023ffa7f08 0000000000000046 0000000000000212 0000000000000000
> 0000000000000000 ffffffff8024cc49 0000000000000000 0000010143863bc0
> 0000000000000006 000000018025c186
> Call Trace:<ffffffff8024cc49>{dst_destroy+169} <ffffffff8013deb1>{__do_softirq+113}
> <ffffffff8013e3a0>{ksoftirqd+0} <ffffffff8013e3df>{ksoftirqd+63}
> <ffffffff8014de42>{kthread+146} <ffffffff801124ab>{child_rip+8}
> <ffffffff8013e3a0>{ksoftirqd+0} <ffffffff8014ddb0>{kthread+0}
> <ffffffff801124a3>{child_rip+0}
> events/0 S ffffffff801607e0 0 6 1 8 7 5 (L-TLB)
> 000001000c08be58 0000000000000046 000001000c08bd88 0000000000000256
> 0000007380396e68 0000000000000256 0000000000000212 00000100fbf622c0
> 00000100fbf622c0 0000000000000212
> Call Trace:<ffffffff801350f3>{__wake_up+67} <ffffffff801607e0>{cache_reap+0}
> <ffffffff801497ae>{worker_thread+270} <ffffffff80135030>{default_wake_function+0}
> <ffffffff80135030>{default_wake_function+0} <ffffffff801496a0>{worker_thread+0}
> <ffffffff8014de42>{kthread+146} <ffffffff801124ab>{child_rip+8}
> <ffffffff801496a0>{worker_thread+0} <ffffffff8014ddb0>{kthread+0}
> <ffffffff801124a3>{child_rip+0}
> events/1 S ffffffff801607e0 0 7 1 1154 41 6 (L-TLB)
> 000001023fe4de58 0000000000000046 000001013fffee80 ffffffff8015eda7
> 0000007700000000 0000000000000012 0000000000000012 000001013fffee80
> 0000000000000003 0000000100000212
> Call Trace:<ffffffff8015eda7>{slab_destroy+151} <ffffffff801350f3>{__wake_up+67}
> <ffffffff801607e0>{cache_reap+0} <ffffffff801497ae>{worker_thread+270}
> <ffffffff80135030>{default_wake_function+0} <ffffffff80135030>{default_wake_function+0}
> <ffffffff801496a0>{worker_thread+0} <ffffffff8014de42>{kthread+146}
> <ffffffff801124ab>{child_rip+8} <ffffffff801496a0>{worker_thread+0}
> <ffffffff8014ddb0>{kthread+0} <ffffffff801124a3>{child_rip+0}
>
> khelper S 000001023fe26828 0 8 6 9 (L-TLB)
> 000001000c08fe58 0000000000000046 00000100ad17dd88 0000000000000212
> 0000006a80149390 ffffffff80112446 0000010088e3e810 000000000000006a
> 000001000c004740 000000003fe26800
> Call Trace:<ffffffff80112446>{kernel_thread+130} <ffffffff801350f3>{__wake_up+67}
> <ffffffff801124a3>{child_rip+0} <ffffffff80149390>{__call_usermodehelper+0}
> <ffffffff801497ae>{worker_thread+270} <ffffffff80135030>{default_wake_function+0}
> <ffffffff80135030>{default_wake_function+0} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff801496a0>{worker_thread+0} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff8014de42>{kthread+146} <ffffffff801124ab>{child_rip+8}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801496a0>{worker_thread+0}
> <ffffffff8014ddb0>{kthread+0} <ffffffff801124a3>{child_rip+0}
>
> kacpid S ffffffff8014de80 0 9 6 39 8 (L-TLB)
> 000001014515fe58 0000000000000046 0000000000000000 0000000000000000
> 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000 0000000100000000
> Call Trace:<ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801497ae>{worker_thread+270}
> <ffffffff80135030>{default_wake_function+0} <ffffffff80135030>{default_wake_function+0}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801496a0>{worker_thread+0}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff8014de42>{kthread+146}
> <ffffffff801124ab>{child_rip+8} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff801496a0>{worker_thread+0} <ffffffff8014ddb0>{kthread+0}
> <ffffffff801124a3>{child_rip+0}
> kblockd/0 S ffffffff80225400 0 39 6 40 9 (L-TLB)
> 000001013fe51e58 0000000000000046 000000000000007a ffffffffa00355b2
> 0000000000000212 0000000000000000 000000004520e800 0000010140009400
> 0000000000000000 0000000045281b40
> Call Trace:<ffffffffa00355b2>{:mptscsih:mptscsih_qcmd+770} <ffffffff801350f3>{__wake_up+67}
> <ffffffff80225400>{as_work_handler+0} <ffffffff801497ae>{worker_thread+270}
> <ffffffff80135030>{default_wake_function+0} <ffffffff80135030>{default_wake_function+0}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801496a0>{worker_thread+0}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff8014de42>{kthread+146}
> <ffffffff801124ab>{child_rip+8} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff801496a0>{worker_thread+0} <ffffffff8014ddb0>{kthread+0}
> <ffffffff801124a3>{child_rip+0}
> kblockd/1 S ffffffff8021e180 0 40 6 52 39 (L-TLB)
> 0000010145193e58 0000000000000046 0000000000000216 0000000000000000
> 000000004520e800 0000010140009400 0000000000000000 0000010145281b40
> 0000010145216000 0000000180224858
> Call Trace:<ffffffff801350f3>{__wake_up+67} <ffffffff8021e180>{blk_unplug_work+0}
> <ffffffff801497ae>{worker_thread+270} <ffffffff80135030>{default_wake_function+0}
> <ffffffff80135030>{default_wake_function+0} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff801496a0>{worker_thread+0} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff8014de42>{kthread+146} <ffffffff801124ab>{child_rip+8}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801496a0>{worker_thread+0}
> <ffffffff8014ddb0>{kthread+0} <ffffffff801124a3>{child_rip+0}
>
> khubd S 0000000000000000 0 41 1 54 7 (L-TLB)
> 00000101451a5ec8 0000000000000046 00000300801c1ad0 0000000000000001
> 000001013ff78400 0000000000000300 000001023fe30600 0000000000000000
> 000001013ff78400 000000018022bad6
> Call Trace:<ffffffff8022bdf8>{hub_events+56} <ffffffff8022c1ce>{hub_thread+206}
> <ffffffff80136a00>{autoremove_wake_function+0} <ffffffff80133a40>{finish_task_switch+64}
> <ffffffff80136a00>{autoremove_wake_function+0} <ffffffff80133aa1>{schedule_tail+17}
> <ffffffff801124ab>{child_rip+8} <ffffffff8022c100>{hub_thread+0}
> <ffffffff801124a3>{child_rip+0}
> pdflush S ffffffff8014de80 0 52 6 53 40 (L-TLB)
> 000001013fe83eb8 0000000000000046 0000000000000000 000000002faef350
> 0000006c00000000 0000000000ff347f 000001023fe25810 000000000000006c
> 000001000c004740 0000000000ff347f
> Call Trace:<ffffffff801335c0>{try_to_wake_up+528} <ffffffff80132d0a>{task_rq_lock+74}
> <ffffffff8015d220>{pdflush+0} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff8015d0ea>{__pdflush+170} <ffffffff8015d23c>{pdflush+28}
> <ffffffff8015d220>{pdflush+0} <ffffffff8014de42>{kthread+146}
> <ffffffff801124ab>{child_rip+8} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff8015d220>{pdflush+0} <ffffffff8014ddb0>{kthread+0}
> <ffffffff801124a3>{child_rip+0}
> pdflush S ffffffff8014de80 0 53 6 56 52 (L-TLB)
> 000001013fe85eb8 0000000000000046 0000000000000216 ffffffff801417ef
> 00000000fffffffc 00000000000011bc 000001013fe85e48 000000010794cb83
> 00000000fffffffc 0000000100000212
> Call Trace:<ffffffff801417ef>{__mod_timer+303} <ffffffff8015d220>{pdflush+0}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff8015d0ea>{__pdflush+170}
> <ffffffff8015d23c>{pdflush+28} <ffffffff8014de42>{kthread+146}
> <ffffffff801124ab>{child_rip+8} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff8015d220>{pdflush+0} <ffffffff8014ddb0>{kthread+0}
> <ffffffff801124a3>{child_rip+0}
> aio/0 S 000001013fe4a028 0 56 6 57 53 (L-TLB)
> 000001013fe89e58 0000000000000046 0000000000000000 0000000000000000
> 0000006c00000000 0000000000000000 000001014518d810 000000000000006c
> 000001000c004740 0000000000000000
> Call Trace:<ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801497ae>{worker_thread+270}
> <ffffffff80135030>{default_wake_function+0} <ffffffff80135030>{default_wake_function+0}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801496a0>{worker_thread+0}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff8014de42>{kthread+146}
> <ffffffff801124ab>{child_rip+8} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff801496a0>{worker_thread+0} <ffffffff8014ddb0>{kthread+0}
> <ffffffff801124a3>{child_rip+0}
> kswapd1 S 0000010140001798 0 54 1 55 41 (L-TLB)
> 000001013fe87eb8 0000000000000046 ffffffff802f5f48 ffffffff80162255
> 000000790000000c 0000000000000001 00000101cb7ef7d0 0000000000000079
> 00000101438619c0 00000001000f5995
> Call Trace:<ffffffff80162255>{shrink_slab+341} <ffffffff80163692>{balance_pgdat+2}
> <ffffffff80163ad5>{kswapd+261} <ffffffff80136a00>{autoremove_wake_function+0}
> <ffffffff80133a40>{finish_task_switch+64} <ffffffff80136a00>{autoremove_wake_function+0}
> <ffffffff80133aa1>{schedule_tail+17} <ffffffff801124ab>{child_rip+8}
> <ffffffff801639d0>{kswapd+0} <ffffffff801124a3>{child_rip+0}
>
> kswapd0 S 0000000000000000 0 55 1 639 54 (L-TLB)
> 00000101451b9eb8 0000000000000046 ffffffff802f5f48 ffffffff80162255
> 0000008600000004 0000000000000000 000001014000d070 0000000000000086
> 000001000c004740 0000000000000b40
> Call Trace:<ffffffff80162255>{shrink_slab+341} <ffffffff80163ad5>{kswapd+261}
> <ffffffff80136a00>{autoremove_wake_function+0} <ffffffff80133a40>{finish_task_switch+64}
> <ffffffff80136a00>{autoremove_wake_function+0} <ffffffff80133aa1>{schedule_tail+17}
> <ffffffff801124ab>{child_rip+8} <ffffffff801639d0>{kswapd+0}
> <ffffffff801124a3>{child_rip+0}
> aio/1 S ffffffff8014de80 0 57 6 56 (L-TLB)
> 000001013fe8be58 0000000000000046 0000000000000000 0000000000000000
> 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000 0000000100000000
> Call Trace:<ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801497ae>{worker_thread+270}
> <ffffffff80135030>{default_wake_function+0} <ffffffff80135030>{default_wake_function+0}
> <ffffffff801496a0>{worker_thread+0} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff8014de42>{kthread+146} <ffffffff801124ab>{child_rip+8}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801496a0>{worker_thread+0}
> <ffffffff8014ddb0>{kthread+0} <ffffffff801124a3>{child_rip+0}
>
> kseriod S 00000100fbc3df08 0 639 1 726 55 (L-TLB)
> 00000100fbc3dec8 0000000000000046 0000003000000008 00000100fbc3ded8
> 00000077fbc3de18 ffffffff8013311c 00000100fbd177d0 0000000000000077
> 000001000c004740 00000000000927c0
> Call Trace:<ffffffff8013311c>{deactivate_task+44} <ffffffff8020f7b6>{serio_thread+246}
> <ffffffff80136a00>{autoremove_wake_function+0} <ffffffff80133a40>{finish_task_switch+64}
> <ffffffff80136a00>{autoremove_wake_function+0} <ffffffff80133aa1>{schedule_tail+17}
> <ffffffff801124ab>{child_rip+8} <ffffffff8020f6c0>{serio_thread+0}
> <ffffffff801124a3>{child_rip+0}
> scsi_eh_0 S 000001014527ff18 0 726 1 733 639 (L-TLB)
> 000001014527fe48 0000000000000046 0000000000000000 0000000000000000
> 0000007500000000 00000100fbc44baa 000001000565c810 0000000000000075
> 00000101438619c0 0000000100000000
> Call Trace:<ffffffff8029b521>{__down_interruptible+209} <ffffffff80135030>{default_wake_function+0}
> <ffffffff8029cab5>{__down_failed_interruptible+53}
> <ffffffffa000d143>{:scsi_mod:.text.lock.scsi_error+45}
> <ffffffff801124ab>{child_rip+8} <ffffffffa000cd80>{:scsi_mod:scsi_error_handler+0}
> <ffffffff801124a3>{child_rip+0}
> scsi_eh_1 S 000001013fd47f18 0 733 1 1158 726 (L-TLB)
> 000001013fd47e48 0000000000000046 0000000000000000 0000000000000000
> 0000007700000000 000001000565c44a 000001000565c810 0000000000000077
> 000001000c004740 0000000000000000
> Call Trace:<ffffffff8029b521>{__down_interruptible+209} <ffffffff80135030>{default_wake_function+0}
> <ffffffff8029cab5>{__down_failed_interruptible+53}
> <ffffffffa000d143>{:scsi_mod:.text.lock.scsi_error+45}
> <ffffffff801124ab>{child_rip+8} <ffffffffa000cd80>{:scsi_mod:scsi_error_handler+0}
> <ffffffff801124a3>{child_rip+0}
> xfslogd/0 S ffffffffa013c820 0 1154 7 1155 (L-TLB)
> 00000100fbc41e58 0000000000000046 000001023e911740 ffffffffa01232e0
> 000001013dcc1090 000001023ee5a458 000001023e90c800 000001023e547040
> 0000000000000212 00000000801c574e
> Call Trace:<ffffffffa01232e0>{:xfs:xfs_log_move_tail+80} <ffffffff801350f3>{__wake_up+67}
> <ffffffffa013c820>{:xfs:pagebuf_iodone_work+0} <ffffffffa013c820>{:xfs:pagebuf_iodone_work+0}
> <ffffffff801497ae>{worker_thread+270} <ffffffff80135030>{default_wake_function+0}
> <ffffffff80135030>{default_wake_function+0} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff801496a0>{worker_thread+0} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff8014de42>{kthread+146} <ffffffff801124ab>{child_rip+8}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801496a0>{worker_thread+0}
> <ffffffff8014ddb0>{kthread+0} <ffffffff801124a3>{child_rip+0}
>
> xfslogd/1 S ffffffffa013c820 0 1155 7 1156 1154 (L-TLB)
> 000001023e915e58 0000000000000046 000001023e911b00 ffffffffa01232e0
> 000001023de55050 000001023ee5a668 000001023e90c880 000001023e547580
> 0000000000000212 00000001801c574e
> Call Trace:<ffffffffa01232e0>{:xfs:xfs_log_move_tail+80} <ffffffff801350f3>{__wake_up+67}
> <ffffffffa013c820>{:xfs:pagebuf_iodone_work+0} <ffffffffa013c820>{:xfs:pagebuf_iodone_work+0}
> <ffffffff801497ae>{worker_thread+270} <ffffffff80135030>{default_wake_function+0}
> <ffffffff80135030>{default_wake_function+0} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff801496a0>{worker_thread+0} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff8014de42>{kthread+146} <ffffffff801124ab>{child_rip+8}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801496a0>{worker_thread+0}
> <ffffffff8014ddb0>{kthread+0} <ffffffff801124a3>{child_rip+0}
>
> xfsdatad/0 S ffffffff8014de80 0 1156 7 1157 1155 (L-TLB)
> 000001013ff61e58 0000000000000046 0000000000000000 0000000000000000
> 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000 0000000000000000
> Call Trace:<ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801497ae>{worker_thread+270}
> <ffffffff80135030>{default_wake_function+0} <ffffffff80135030>{default_wake_function+0}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801496a0>{worker_thread+0}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff8014de42>{kthread+146}
> <ffffffff801124ab>{child_rip+8} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff801496a0>{worker_thread+0} <ffffffff8014ddb0>{kthread+0}
> <ffffffff801124a3>{child_rip+0}
> xfsdatad/1 S 000001023e90c0a8 0 1157 7 1156 (L-TLB)
> 000001000c3f1e58 0000000000000046 0000000000000010 0000000000000000
> 0000006d00000008 0000000000000000 000001023f64a7d0 000000000000006d
> 00000101438619c0 0000000100002620
> Call Trace:<ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801497ae>{worker_thread+270}
> <ffffffff80135030>{default_wake_function+0} <ffffffff80135030>{default_wake_function+0}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff801496a0>{worker_thread+0}
> <ffffffff8014de80>{keventd_create_kthread+0} <ffffffff8014de42>{kthread+146}
> <ffffffff801124ab>{child_rip+8} <ffffffff8014de80>{keventd_create_kthread+0}
> <ffffffff801496a0>{worker_thread+0} <ffffffff8014ddb0>{kthread+0}
> <ffffffff801124a3>{child_rip+0}
> xfsbufd S 0000000000508ae0 0 1158 1 1159 733 (L-TLB)
> 0000010005645e98 0000000000000046 000001013ff8ca80 0000010145216330
> 000001014000ae00 0000000000000000 00000000000000dd ffffffffa00355b2
> 0000000000000212 0000000100000000
> Call Trace:<ffffffffa00355b2>{:mptscsih:mptscsih_qcmd+770} <ffffffff801417ef>{__mod_timer+303}
> <ffffffff8029c7ed>{schedule_timeout+173} <ffffffff801423c0>{process_timeout+0}
> <ffffffffa013d5f4>{:xfs:pagebuf_daemon+148} <ffffffff801124ab>{child_rip+8}
> <ffffffffa013d560>{:xfs:pagebuf_daemon+0} <ffffffff801124a3>{child_rip+0}
>
> xfssyncd S 0000000000007530 0 1159 1 1160 1158 (L-TLB)
> 000001023e797e88 0000000000000046 0000010140009e50 ffffffffffffff00
> 000000748029cc23 0000000000000010 000001023d921070 0000000000000074
> 00000101438619c0 00000001a0125b3e
> Call Trace:<ffffffff801417ef>{__mod_timer+303} <ffffffff8029c7ed>{schedule_timeout+173}
> <ffffffff801423c0>{process_timeout+0} <ffffffffa01427be>{:xfs:xfssyncd+142}
> <ffffffffa0142f30>{:xfs:linvfs_fill_super+0} <ffffffff801124ab>{child_rip+8}
> <ffffffffa0142f30>{:xfs:linvfs_fill_super+0} <ffffffffa0142730>{:xfs:xfssyncd+0}
> <ffffffff801124a3>{child_rip+0}
> xfssyncd S 0000000000007530 0 1160 1 1161 1159 (L-TLB)
> 000001023e79be88 0000000000000046 000000003ffe3400 000001023ffe3400
> 000001013fcb1200 000001023ffe3450 0000000000000002 00000ad900000af6
> 0000000000000002 00000001a0125b3e
> Call Trace:<ffffffff801417ef>{__mod_timer+303} <ffffffff8029c7ed>{schedule_timeout+173}
> <ffffffff801423c0>{process_timeout+0} <ffffffffa01427be>{:xfs:xfssyncd+142}
> <ffffffffa0142f30>{:xfs:linvfs_fill_super+0} <ffffffff801124ab>{child_rip+8}
> <ffffffffa0142f30>{:xfs:linvfs_fill_super+0} <ffffffffa0142730>{:xfs:xfssyncd+0}
> <ffffffff801124a3>{child_rip+0}
> kjournald S 000001023ffe4e98 0 1161 1 1162 1160 (L-TLB)
> 000001023f6e9e58 0000000000000046 00000101bab75a28 00000101bab75a80
> 00000101bab75be0 00000101bab75f50 00000101bab758c8 00000101bab75b88
> 00000101bab75d98 00000001bab756b8
> Call Trace:<ffffffff801350f3>{__wake_up+67} <ffffffffa005b2f4>{:jbd:kjournald+532}
> <ffffffff80136a00>{autoremove_wake_function+0} <ffffffff80136a00>{autoremove_wake_function+0}
> <ffffffffa005b0c0>{:jbd:commit_timeout+0} <ffffffff801124ab>{child_rip+8}
> <ffffffffa005b0e0>{:jbd:kjournald+0} <ffffffff801124a3>{child_rip+0}
>
> xfssyncd S 0000000000007530 0 1162 1 1163 1161 (L-TLB)
> 000001023eea1e88 0000000000000046 000001023ffe4c50 ffffffffffffff00
> ffffffffa01259ca 0000000000000010 0000000000000246 000001023eea1df8
> 0000000000000018 00000001a0125b3e
> Call Trace:<ffffffffa01259ca>{:xfs:xlog_state_sync_all+90} <ffffffff801417ef>{__mod_timer+303}
> <ffffffff8029c7ed>{schedule_timeout+173} <ffffffff801423c0>{process_timeout+0}
> <ffffffffa01427be>{:xfs:xfssyncd+142} <ffffffffa0142f30>{:xfs:linvfs_fill_super+0}
> <ffffffff801124ab>{child_rip+8} <ffffffffa0142f30>{:xfs:linvfs_fill_super+0}
> <ffffffffa0142730>{:xfs:xfssyncd+0} <ffffffff801124a3>{child_rip+0}
>
> xfssyncd S 0000000000007530 0 1163 1 1164 1162 (L-TLB)
> 000001023eeb3e88 0000000000000046 000000003ffe4a00 000001023ffe4a00
> 000001023e911d40 000001023ffe4a50 0000000000000002 0000000e000041da
> 0000000000000002 00000000a0125b3e
> Call Trace:<ffffffff801417ef>{__mod_timer+303} <ffffffff8029c7ed>{schedule_timeout+173}
> <ffffffff801423c0>{process_timeout+0} <ffffffffa01427be>{:xfs:xfssyncd+142}
> <ffffffffa0142f30>{:xfs:linvfs_fill_super+0} <ffffffff801124ab>{child_rip+8}
> <ffffffffa0142f30>{:xfs:linvfs_fill_super+0} <ffffffffa0142730>{:xfs:xfssyncd+0}
> <ffffffff801124a3>{child_rip+0}
> xfssyncd S 0000000000007530 0 1164 1 2931 1163 (L-TLB)
> 000001023fdb3e88 0000000000000046 000000003ffe4800 000001023ffe4800
> 000001023e911b00 000001023ffe4850 0000000000000002 00000008000068f5
> 0000000000000002 00000001a0125b3e
> Call Trace:<ffffffff801417ef>{__mod_timer+303} <ffffffff8029c7ed>{schedule_timeout+173}
> <ffffffff801423c0>{process_timeout+0} <ffffffffa01427be>{:xfs:xfssyncd+142}
> <ffffffffa0142f30>{:xfs:linvfs_fill_super+0} <ffffffff801124ab>{child_rip+8}
> <ffffffffa0142f30>{:xfs:linvfs_fill_super+0} <ffffffffa0142730>{:xfs:xfssyncd+0}
> <ffffffff801124a3>{child_rip+0}
> syslogd S 000001013ff51c80 0 2931 1 2934 1164 (NOTLB)
> 000001013fa61d88 0000000000000006 0000000100000000 000001023fd5bb50
> 000000743e7d0468 0000000000000067 000001000c3a7030 0000000000000074
> 000001000c004740 0000000000000246
> Call Trace:<ffffffff8015b19f>{__alloc_pages+831} <ffffffff8029c765>{schedule_timeout+37}
> <ffffffff8013676c>{add_wait_queue+28} <ffffffff80245bf5>{datagram_poll+21}
> <ffffffff8018bd33>{do_select+819} <ffffffff8018b840>{__pollwait+0}
> <ffffffff8018c170>{sys_select+960} <ffffffff8011195a>{system_call+126}
>
> klogd R running task 0 2934 1 2942 2931 (NOTLB)
> inetd S 000001023ef77180 0 2942 1 3035 2934 (NOTLB)
> 000001023eb73d88 0000000000000002 0000000000000000 00000000000004f4
> 0000007600000007 ffffffff8015ae20 000001023f38c7d0 0000000000000076
> 00000101438619c0 0000000140000700
> Call Trace:<ffffffff8015ae20>{buffered_rmqueue+432} <ffffffff8029c765>{schedule_timeout+37}
> <ffffffff8013676c>{add_wait_queue+28} <ffffffff802640b1>{tcp_poll+33}
> <ffffffff8018bd33>{do_select+819} <ffffffff8018b840>{__pollwait+0}
> <ffffffff8018c170>{sys_select+960} <ffffffff8011195a>{system_call+126}
>
> master S 0000000000036db6 0 3035 1 3040 3045 2942 (NOTLB)
> 000001013fa75d88 0000000000000006 0000000000000256 000001013ff84a18
> 000001013ff84bf0 0000000100000000 0000000000000007 ffffffff8015ae20
> 0000000800000001 0000000000000246
> Call Trace:<ffffffff8015ae20>{buffered_rmqueue+432} <ffffffff801417ef>{__mod_timer+303}
> <ffffffff8029c7ed>{schedule_timeout+173} <ffffffff801423c0>{process_timeout+0}
> <ffffffff8018bd33>{do_select+819} <ffffffff8018b840>{__pollwait+0}
> <ffffffff801350f3>{__wake_up+67} <ffffffff8018c170>{sys_select+960}
> <ffffffff8011195a>{system_call+126}
> qmgr S 0000000000000060 0 3040 3035 8534 (NOTLB)
> 000001023e6bbd88 0000000000000002 0000000000000216 ffffffff802425b4
> 000000743e8a95ec 000001023e8a95ec 00000100fbc0f030 0000000000000074
> 000001000c004740 0000000000000246
> Call Trace:<ffffffff802425b4>{sock_def_readable+68} <ffffffff801417ef>{__mod_timer+303}
> <ffffffff8029c7ed>{schedule_timeout+173} <ffffffff801423c0>{process_timeout+0}
> <ffffffff8018bd33>{do_select+819} <ffffffff8018b840>{__pollwait+0}
> <ffffffff8018c170>{sys_select+960} <ffffffff8011195a>{system_call+126}
>
> snmpd S 00000000000001a8 0 3045 1 3051 3035 (NOTLB)
> 000001023e3c1d88 0000000000000006 00000000419a0429 000001023e3c1d78
> 000000743e64aa40 000001023e3c1ec8 000001013ff837d0 0000000000000074
> 00000101438619c0 0000000100000246
> Call Trace:<ffffffff8029c765>{schedule_timeout+37} <ffffffff8013676c>{add_wait_queue+28}
> <ffffffff8017937b>{fget+91} <ffffffff8018bd33>{do_select+819}
> <ffffffff8018b840>{__pollwait+0} <ffffffff8018c170>{sys_select+960}
> <ffffffff8011195a>{system_call+126}
> sshd S 000001013f805ac0 0 3051 1 6952 3057 3045 (NOTLB)
> 000001023df63d88 0000000000000002 0000000000000256 0000010140000700
> 0000007400000007 ffffffff8015ae20 0000010060518070 0000000000000074
> 00000101438619c0 0000000140000700
> Call Trace:<ffffffff8015ae20>{buffered_rmqueue+432} <ffffffff8029c765>{schedule_timeout+37}
> <ffffffff8013676c>{add_wait_queue+28} <ffffffff802640b1>{tcp_poll+33}
> <ffffffff8018bd33>{do_select+819} <ffffffff8018b840>{__pollwait+0}
> <ffffffff80191b89>{clear_inode+9} <ffffffff8018c170>{sys_select+960}
> <ffffffff8011195a>{system_call+126}
> atd S 0000000000000000 0 3057 1 3060 3051 (NOTLB)
> 000001023e6d7ee8 0000000000000006 0000000000000216 000001023de5d138
> 000001023e6d7ef8 ffffffff8018fb11 000001023e6d7e68 000001023e6d7ef8
> 0000000000000000 0000000180181ce9
> Call Trace:<ffffffff8018fb11>{dput+33} <ffffffff801417ef>{__mod_timer+303}
> <ffffffff8029c7ed>{schedule_timeout+173} <ffffffff801423c0>{process_timeout+0}
> <ffffffff801424b1>{sys_nanosleep+193} <ffffffff8011195a>{system_call+126}
>
> cron S 0000000000000000 0 3060 1 3074 3057 (NOTLB)
> 000001023deb7ee8 0000000000000002 0000000000000216 00000101e0d4b3f0
> 000001023deb7ef8 ffffffff8018fb97 000001023deb7e68 000001023deb7ef8
> 0000007fbffffc70 0000000180181ce9
> Call Trace:<ffffffff8018fb97>{dput+167} <ffffffff801417ef>{__mod_timer+303}
> <ffffffff8029c7ed>{schedule_timeout+173} <ffffffff801423c0>{process_timeout+0}
> <ffffffff801424b1>{sys_nanosleep+193} <ffffffff8011195a>{system_call+126}
>
> getty S 000001013fa2cd28 0 3074 1 3076 3060 (NOTLB)
> 000001023e59dd78 0000000000000006 000000000000001c ffffffff801575ea
> 0000000000000019 000000000000001b 0000000000000000 0000000000000000
> 000001023da29348 0000000180157610
> Call Trace:<ffffffff801575ea>{do_generic_mapping_read+1034} <ffffffff80208469>{do_con_write+1657}
> <ffffffff8029c765>{schedule_timeout+37} <ffffffff801d12f2>{vgacon_cursor+242}
> <ffffffff8013676c>{add_wait_queue+28} <ffffffff801fcece>{read_chan+926}
> <ffffffff80135030>{default_wake_function+0} <ffffffff80135030>{default_wake_function+0}
> <ffffffff801f6a75>{tty_ldisc_deref+117} <ffffffff801f7870>{tty_read+256}
> <ffffffff80178377>{vfs_read+199} <ffffffff80178623>{sys_read+83}
> <ffffffff8011195a>{system_call+126}
> getty S 000001023e0fcd28 0 3076 1 3077 3074 (NOTLB)
> 000001023d835d78 0000000000000002 000000000000001c ffffffff801575ea
> 000001023e0fc000 000000000000001b 0000000000000000 0000000000000000
> 000001023da29348 0000000180157610
> Call Trace:<ffffffff801575ea>{do_generic_mapping_read+1034} <ffffffff80208469>{do_con_write+1657}
> <ffffffff8029c765>{schedule_timeout+37} <ffffffff8013676c>{add_wait_queue+28}
> <ffffffff801fcece>{read_chan+926} <ffffffff80135030>{default_wake_function+0}
> <ffffffff80135030>{default_wake_function+0} <ffffffff801f6a75>{tty_ldisc_deref+117}
> <ffffffff801f7870>{tty_read+256} <ffffffff80178377>{vfs_read+199}
> <ffffffff80178623>{sys_read+83} <ffffffff8011195a>{system_call+126}
>
> getty S 00000100fbca2d28 0 3077 1 3078 3076 (NOTLB)
> 000001023d859d78 0000000000000002 000000000000001c ffffffff801575ea
> 00000074fbca2000 000000000000001b 000001023d8047d0 0000000000000074
> 00000101438619c0 0000000180157610
> Call Trace:<ffffffff801575ea>{do_generic_mapping_read+1034} <ffffffff8013975a>{release_console_sem+138}
> <ffffffff80208469>{do_con_write+1657} <ffffffff8029c765>{schedule_timeout+37}
> <ffffffff8013676c>{add_wait_queue+28} <ffffffff801fcece>{read_chan+926}
> <ffffffff80135030>{default_wake_function+0} <ffffffff80135030>{default_wake_function+0}
> <ffffffff801f6a75>{tty_ldisc_deref+117} <ffffffff801f7870>{tty_read+256}
> <ffffffff80178377>{vfs_read+199} <ffffffff80178623>{sys_read+83}
> <ffffffff8011195a>{system_call+126}
> getty S 000001023e7c2d28 0 3078 1 3079 3077 (NOTLB)
> 000001023d86bd78 0000000000000002 000000000000001c ffffffff801575ea
> 000000743e7c2000 000000000000001b 000001023d804030 0000000000000074
> 00000101438619c0 0000000180157610
> Call Trace:<ffffffff801575ea>{do_generic_mapping_read+1034} <ffffffff8013975a>{release_console_sem+138}
> <ffffffff80208469>{do_con_write+1657} <ffffffff8029c765>{schedule_timeout+37}
> <ffffffff8013676c>{add_wait_queue+28} <ffffffff801fcece>{read_chan+926}
> <ffffffff80135030>{default_wake_function+0} <ffffffff80135030>{default_wake_function+0}
> <ffffffff801f6a75>{tty_ldisc_deref+117} <ffffffff801f7870>{tty_read+256}
> <ffffffff80178377>{vfs_read+199} <ffffffff80178623>{sys_read+83}
> <ffffffff8011195a>{system_call+126}
> getty S 000001023df85d28 0 3079 1 3080 3078 (NOTLB)
> 000001023d88dd78 0000000000000006 000000000000001c ffffffff801575ea
> 000000743df85000 000000000000001b 000001023d877810 0000000000000074
> 00000101438619c0 0000000180157610
> Call Trace:<ffffffff801575ea>{do_generic_mapping_read+1034} <ffffffff8013975a>{release_console_sem+138}
> <ffffffff80208469>{do_con_write+1657} <ffffffff8029c765>{schedule_timeout+37}
> <ffffffff8013676c>{add_wait_queue+28} <ffffffff801fcece>{read_chan+926}
> <ffffffff80135030>{default_wake_function+0} <ffffffff80135030>{default_wake_function+0}
> <ffffffff801f6a75>{tty_ldisc_deref+117} <ffffffff801f7870>{tty_read+256}
> <ffffffff80178377>{vfs_read+199} <ffffffff80178623>{sys_read+83}
> <ffffffff8011195a>{system_call+126}
> getty S 000001023e770d28 0 3080 1 5390 3079 (NOTLB)
> 000001023d8a1d78 0000000000000002 000000000000001c ffffffff801575ea
> 000001023e770000 000000000000001b 0000000000000000 0000000000000000
> 000001023da29348 0000000180157610
> Call Trace:<ffffffff801575ea>{do_generic_mapping_read+1034} <ffffffff80208469>{do_con_write+1657}
> <ffffffff8029c765>{schedule_timeout+37} <ffffffff8013676c>{add_wait_queue+28}
> <ffffffff801fcece>{read_chan+926} <ffffffff80135030>{default_wake_function+0}
> <ffffffff80135030>{default_wake_function+0} <ffffffff801f6a75>{tty_ldisc_deref+117}
> <ffffffff801f7870>{tty_read+256} <ffffffff80178377>{vfs_read+199}
> <ffffffff80178623>{sys_read+83} <ffffffff8011195a>{system_call+126}
>
> mysqld D 000001023e034d80 0 5390 1 7663 3080 (NOTLB)
> 0000010211817c88 0000000000000002 0000010211817c98 000000003b98c02b
> 0000007400000000 0000000000000000 000001023f7d87d0 0000000000000074
> 00000101438619c0 0000000100000001
> Call Trace:<ffffffff801335c0>{try_to_wake_up+528} <ffffffff8029c9f4>{__down_write+132}
> <ffffffffa011aaac>{:xfs:xfs_ilock+44} <ffffffffa0141742>{:xfs:xfs_write+594}
> <ffffffff8015b19f>{__alloc_pages+831} <ffffffffa013dc05>{:xfs:linvfs_write+101}
> <ffffffff8017847d>{do_sync_write+173} <ffffffff80167b04>{handle_mm_fault+260}
> <ffffffff801c31fd>{__up_read+29} <ffffffff8029c1fe>{thread_return+41}
> <ffffffff80136a00>{autoremove_wake_function+0} <ffffffff80178577>{vfs_write+199}
> <ffffffff801787f8>{sys_pwrite64+104} <ffffffff8011195a>{system_call+126}
>
> sshd S 0000000000000198 0 6952 3051 6954 8569 (NOTLB)
> 00000101ed1e5d88 0000000000000002 00000101ed1e5ce8 0000010191826278
> 000000000055ba80 00000000659d37d0 0000000000000007 ffffffff8015ae20
> 00000101ed1e5de8 0000000000000246
> Call Trace:<ffffffff8015ae20>{buffered_rmqueue+432} <ffffffff8029c765>{schedule_timeout+37}
> <ffffffff8013676c>{add_wait_queue+28} <ffffffffa0002cf5>{:unix:unix_poll+21}
> <ffffffff8018bd33>{do_select+819} <ffffffff8018b840>{__pollwait+0}
> <ffffffff8018c170>{sys_select+960} <ffffffff8011195a>{system_call+126}
>
> bash S 00000100dbcffd28 0 6954 6952 (NOTLB)
> 000001007b57dd78 0000000000000002 000000003ff0da00 00000100000129d0
> 000000740000000f 0000010000012700 00000101fd69a070 0000000000000074
> 000001000c004740 000000008015a913
> Call Trace:<ffffffff8015a5d7>{free_pages_bulk+663} <ffffffff8029c765>{schedule_timeout+37}
> <ffffffff8013676c>{add_wait_queue+28} <ffffffff801fcece>{read_chan+926}
> <ffffffff80135030>{default_wake_function+0} <ffffffff80135030>{default_wake_function+0}
> <ffffffff80136829>{remove_wait_queue+25} <ffffffff801f7870>{tty_read+256}
> <ffffffff80178377>{vfs_read+199} <ffffffff80178623>{sys_read+83}
> <ffffffff8011195a>{system_call+126}
> mysqld D 000001022b239db8 0 7663 1 8657 5390 (NOTLB)
> 000001009c017ae8 0000000000000002 00000102297ae070 0000000000000001
> 000000743ff0d180 00000102297ae070 00000101a76b4030 0000000000000074
> 00000101438619c0 00000001297ae070
> Call Trace:<ffffffff8029b3d8>{__down+152} <ffffffff80135030>{default_wake_function+0}
> <ffffffff8029c952>{__down_read+130} <ffffffff8029ca7b>{__down_failed+53}
> <ffffffff8019c6c8>{.text.lock.direct_io+15} <ffffffff801417ef>{__mod_timer+303}
> <ffffffffa013b22a>{:xfs:linvfs_direct_IO+186} <ffffffffa013b150>{:xfs:linvfs_get_blocks_direct+0}
> <ffffffffa0139ee0>{:xfs:linvfs_unwritten_convert_direct+0}
> <ffffffff80266402>{cleanup_rbuf+242} <ffffffff801592e4>{generic_file_direct_IO+100}
> <ffffffff80157816>{__generic_file_aio_read+214} <ffffffff801c31fd>{__up_read+29}
> <ffffffffa014103f>{:xfs:xfs_read+447} <ffffffffa013db23>{:xfs:linvfs_read+99}
> <ffffffff8011115f>{setup_rt_frame+143} <ffffffff8017827d>{do_sync_read+173}
> <ffffffff80133a40>{finish_task_switch+64} <ffffffff8029c1fe>{thread_return+41}
> <ffffffff80136a00>{autoremove_wake_function+0} <ffffffff80178377>{vfs_read+199}
> <ffffffff80178758>{sys_pread64+104} <ffffffff8011195a>{system_call+126}
>
> pickup S 0000000000000060 0 8534 3035 3040 (NOTLB)
> 00000100b49e5d88 0000000000000002 0000000000000216 ffffffff802425b4
> 000001013ff84c2c 000001013ff84c2c 0000000000000007 ffffffff8015ae20
> 0000000800000007 0000000100000246
> Call Trace:<ffffffff802425b4>{sock_def_readable+68} <ffffffff8015ae20>{buffered_rmqueue+432}
> <ffffffff801417ef>{__mod_timer+303} <ffffffff8029c7ed>{schedule_timeout+173}
> <ffffffff801423c0>{process_timeout+0} <ffffffff8018bd33>{do_select+819}
> <ffffffff8018b840>{__pollwait+0} <ffffffff8018c170>{sys_select+960}
> <ffffffff8011195a>{system_call+126}
> sshd S 0000000000000198 0 8569 3051 8571 6952 (NOTLB)
> 000001015cffbd88 0000000000000006 000001015cffbce8 0000010005848778
> 0000007300573390 0000000011120810 0000010211120810 0000000000000073
> 00000101438619c0 0000000100000246
> Call Trace:<ffffffff8029c765>{schedule_timeout+37} <ffffffff8013676c>{add_wait_queue+28}
> <ffffffffa0002cf5>{:unix:unix_poll+21} <ffffffff8018bd33>{do_select+819}
> <ffffffff8018b840>{__pollwait+0} <ffffffff8018c170>{sys_select+960}
> <ffffffff8011195a>{system_call+126}
> bash R running task 0 8571 8569 (NOTLB)
> mysqld D 0000000000000000 0 8657 1 8658 7663 (NOTLB)
> 0000010146e07e80 0000000000000006 0000010146e07e18 0000010146e07e08
> 000001023f6c33c0 0000000000000101 000001022b22ac18 0000010146e07e18
> ffffffff8018fb11 0000000100000000
> Call Trace:<ffffffff8018fb11>{dput+33} <ffffffff801859a5>{permission+37}
> <ffffffff801876af>{may_open+95} <ffffffff8029b3d8>{__down+152}
> <ffffffff80135030>{default_wake_function+0} <ffffffff8029ca7b>{__down_failed+53}
> <ffffffff80179053>{.text.lock.read_write+5} <ffffffff80178052>{vfs_llseek+50}
> <ffffffff801780b2>{sys_lseek+82} <ffffffff8011195a>{system_call+126}
>
> mysqld Z 000001005b0edf58 0 8658 8657 (L-TLB)
> 000001005b0edde8 0000000000000046 0000000000000001 0000000000000010
> 0000007a0c3d7070 0000000000000010 000001007f5c4030 000000000000007a
> 00000101438619c0 0000000100000001
> Call Trace:<ffffffff8013b937>{exit_notify+2039} <ffffffff8013bd9b>{do_exit+1003}
> <ffffffff8013bf3c>{do_group_exit+252} <ffffffff801453aa>{get_signal_to_deliver+1082}
> <ffffffff801119e3>{sysret_signal+28} <ffffffff801116ce>{do_signal+142}
> <ffffffff8018b82c>{poll_freewait+76} <ffffffff8018c6ce>{sys_poll+526}
> <ffffffff8018b840>{__pollwait+0} <ffffffff80111ccf>{ptregscall_common+103}
>
>
>
>
>
>
> On Sun, 14 Nov 2004, Brad Fitzpatrick wrote:
>
> > We have two database servers which freeze up during heavy IO load. The
> > machines themselves are responsible, but the mysqld processes are forever
> > locked, unkillable with even kill -9. I can't restart with MySQL without
> > rebooting the machines.
> >
> > I can reasonable rule out hardware, since this is happening in the
> > same way on two identical machines.
> >
> > I'd like to know how I can debug this, to file a proper bug report.
> >
> > The hardware/software stack is:
> >
> > - Dual Opteron 246, SMP kernel, w/ NUMA
> > - 9 GB of memory (4GB in one zone, 5GB in the other)
> > - MySQL, running mostly InnoDB, but some MyISAM
> > - MegaRAID raid-10
> > - device mapper
> > - XFS (used as both O_DIRECT from InnoDB and regularly from MyISAM)
> >
> > At this point I'm going to try changing different variables on
> > different machines in order to try and isolate it, but it's a slow
> > process.
> >
> > - on raw partions, instead of device mapper
> > - ext3 instead of XFS
> > - not using O_DIRECT
> >
> > "Screenshot":
> >
> > roast:~# killall -9 mysqld
> > roast:~# killall -9 mysqld
> > roast:~# ps afx | grep mysqld
> > 31495 ? D 0:08 /usr/local/mysql/bin/mysqld --defaults-extra-file=/usr/local/mysql/data/my.cnf --basedir=/usr/local/mysql/ --datadir=/data/mydb --user=root
> > --pid-file=/var/run/mysqld/mysqld.pid --skip-locking --port=3306 --socket=/var/run/mysqld/mysqld.sock
> > 32391 ? D 0:01 /usr/local/mysql/bin/mysqld --defaults-extra-file=/usr/local/mysql/data/my.cnf --basedir=/usr/local/mysql/ --datadir=/data/mydb --user=root
> > --pid-file=/var/run/mysqld/mysqld.pid --skip-locking --port=3306 --socket=/var/run/mysqld/mysqld.sock
> > 515 ? D 0:00 /usr/local/mysql/bin/mysqld --defaults-extra-file=/usr/local/mysql/data/my.cnf --basedir=/usr/local/mysql/ --datadir=/data/mydb --user=root
> > --pid-file=/var/run/mysqld/mysqld.pid --skip-locking --port=3306 --socket=/var/run/mysqld/mysqld.sock
> > 517 ? Z 0:00 \_ [mysqld] <defunct>
> >
> > Next time it hangs like this, how can I get a kernel backtrace or other useful information
> > for a certain process?
> >
> > Thanks!
> >
> > - Brad
> >
> > -
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