soft lockup - jfs problem?

[Mark Foster]

We saw soft lockup this morning on a Ubuntu Lucid 64-bit system with
kernel 2.6.32-33-server and jfs module shown here
root@db11e:/usr/src/linux-source-2.6.32/fs/jfs# modinfo jfs
filename: /lib/modules/2.6.32-33-server/kernel/fs/jfs/jfs.ko
license: GPL
author: Steve Best/Dave Kleikamp/Barry Arndt, IBM
description: The Journaled Filesystem (JFS)
srcversion: 78CD09626BDB4AE9FF29322
depends:
vermagic: 2.6.32-33-server SMP mod_unload modversions
parm: nTxBlock:Number of transaction blocks (max:65536) (int)
parm: nTxLock:Number of transaction locks (max:65536) (int)
parm: commit_threads:Number of commit threads (int)

dmesg output (snippet) has this
[4739878.082195] INFO: task mysqld:7824 blocked for more than 120 seconds.
[4739878.082488] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[4739878.082852] mysqld D 0000000000000000 0 7824 18081
0x00000000
[4739878.082857] ffff88004bc17b08 0000000000000082 0000000000015f00
0000000000015f00
[4739878.082862] ffff8813aaf51ad0 ffff88004bc17fd8 0000000000015f00
ffff8813aaf51700
[4739878.082866] 0000000000015f00 ffff88004bc17fd8 0000000000015f00
ffff8813aaf51ad0
[4739878.082871] Call Trace:
[4739878.082885] [<ffffffff81558303>] io_schedule+0x73/0xc0
[4739878.082902] [<ffffffffa00420a6>] txBegin+0x1b6/0x3a0 [jfs]
[4739878.082910] [<ffffffff8115e74e>] ? insert_inode_locked+0xae/0x110
[4739878.082917] [<ffffffff8105df00>] ? default_wake_function+0x0/0x20
[4739878.082924] [<ffffffffa0025459>] jfs_create+0x89/0x390 [jfs]
[4739878.082927] [<ffffffff8115c136>] ? __d_lookup+0x136/0x150
[4739878.082931] [<ffffffff8155a29e>] ? _spin_lock+0xe/0x20
[4739878.082935] [<ffffffff8115c136>] ? __d_lookup+0x136/0x150
[4739878.082942] [<ffffffffa0045c19>] ? jfs_check_acl+0x29/0x78 [jfs]
[4739878.082947] [<ffffffff8108d9f1>] ? in_group_p+0x31/0x40
[4739878.082951] [<ffffffff8108d9f1>] ? in_group_p+0x31/0x40
[4739878.082955] [<ffffffff8115045d>] ? acl_permission_check+0x5d/0xc0
[4739878.082960] [<ffffffff81151f74>] vfs_create+0xb4/0xe0
[4739878.082964] [<ffffffff81152064>] __open_namei_create+0xc4/0x110
[4739878.082968] [<ffffffff8115580b>] do_filp_open+0xa6b/0xba0
[4739878.082973] [<ffffffff81160b0a>] ? alloc_fd+0x10a/0x150
[4739878.082978] [<ffffffff811447c9>] do_sys_open+0x69/0x170
[4739878.082982] [<ffffffff81144910>] sys_open+0x20/0x30
[4739878.082989] [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b
[4739878.083009] INFO: task mysqld:12747 blocked for more than 120 seconds.
[4739878.083289] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[4739878.112750] mysqld D ffff8811db94cae8 0 12747 18081
0x00000000
[4739878.112755] ffff880052563d38 0000000000000082 0000000000015f00
0000000000015f00
[4739878.112760] ffff8811d5089ad0 ffff880052563fd8 0000000000015f00
ffff8811d5089700
[4739878.112764] 0000000000015f00 ffff880052563fd8 0000000000015f00
ffff8811d5089ad0
[4739878.112768] Call Trace:
[4739878.112773] [<ffffffff81559037>] __mutex_lock_slowpath+0x107/0x190
[4739878.112777] [<ffffffff81151801>] ? path_put+0x31/0x40
[4739878.112782] [<ffffffff81558a33>] mutex_lock+0x23/0x50
[4739878.112786] [<ffffffff81155179>] do_filp_open+0x3d9/0xba0
[4739878.112790] [<ffffffff81160b0a>] ? alloc_fd+0x10a/0x150
[4739878.112794] [<ffffffff811447c9>] do_sys_open+0x69/0x170
[4739878.112798] [<ffffffff81144910>] sys_open+0x20/0x30
[4739878.112802] [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b

Is this a jfs problem? I saw http://bugs.centos.org/view.php?id=4747 and
thought it might be the same issue but perusing the linux kernel source
it appears to have the patch already.