Comment 6 for bug 262843

Still happens with 2.6.27-4.5 on AMD64:

[ 3472.484065] INFO: task mutt:32170 blocked for more than 120 seconds.
[ 3472.484077] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3472.484082] mutt D 0000000000000002 0 32170 1
[ 3472.484090] ffff88007e52bb08 0000000000000046 ffff880079659ed8 ffff88011986e000
[ 3472.484098] ffffffff807c4400 ffffffff807c4400 ffffffff807c4400 ffffffff807c4400
[ 3472.484105] ffffffff807c4400 ffffffff807c4400 ffffffff807c4400 ffffffff807c4400
[ 3472.484110] Call Trace:
[ 3472.484125] [<ffffffff803a8da9>] ? rb_insert_color+0x109/0x140
[ 3472.484135] [<ffffffff80519b55>] schedule_timeout+0x95/0xd0
[ 3472.484144] [<ffffffff8026ac7f>] ? hrtimer_start+0xdf/0x1b0
[ 3472.484150] [<ffffffff80519906>] wait_for_common+0xb6/0x1a0
[ 3472.484158] [<ffffffff802474d0>] ? default_wake_function+0x0/0x10
[ 3472.484165] [<ffffffff80519a88>] wait_for_completion+0x18/0x20
[ 3472.484172] [<ffffffff80262b12>] flush_cpu_workqueue+0x62/0xa0
[ 3472.484178] [<ffffffff80262770>] ? wq_barrier_func+0x0/0x20
[ 3472.484184] [<ffffffff80262ca3>] flush_workqueue+0x53/0x70
[ 3472.484190] [<ffffffff80262cd5>] flush_scheduled_work+0x15/0x20
[ 3472.484197] [<ffffffff8040cdfd>] tty_ldisc_release+0x4d/0x1f0
[ 3472.484203] [<ffffffff80245cb0>] ? __cond_resched+0x20/0x50
[ 3472.484208] [<ffffffff8051b33e>] ? _spin_lock+0xe/0x20
[ 3472.484215] [<ffffffff8040685d>] release_dev+0x45d/0x5c0
[ 3472.484222] [<ffffffff802e326e>] ? __free_slab+0x9e/0x140
[ 3472.484229] [<ffffffff803076d6>] ? mntput_no_expire+0x36/0x160
[ 3472.484235] [<ffffffff804069de>] tty_release+0x1e/0x30
[ 3472.484241] [<ffffffff802ec929>] __fput+0xc9/0x1b0
[ 3472.484245] [<ffffffff802eca35>] fput+0x25/0x30
[ 3472.484250] [<ffffffff802e8ddb>] filp_close+0x5b/0x90
[ 3472.484256] [<ffffffff802511e2>] put_files_struct+0x82/0xe0
[ 3472.484261] [<ffffffff80251294>] exit_files+0x54/0x70
[ 3472.484266] [<ffffffff802531bd>] do_exit+0x2ad/0x410
[ 3472.484271] [<ffffffff80253367>] do_group_exit+0x47/0xc0
[ 3472.484277] [<ffffffff802533f7>] sys_exit_group+0x17/0x20
[ 3472.484284] [<ffffffff8021288a>] system_call_fastpath+0x16/0x1b