Task(s) blocked due to CPU's workqueue stalled by hpsa driver

Issue

• "INFO: task foo:666 blocked for more than 120 seconds." message on console or logs.

• Tasks stuck while waiting for completion of delayed work.

• Server hung or panicked with following messages:

  INFO: task sshd:6425 blocked for more than 120 seconds.
        Not tainted 2.6.32-431.11.2.el6.x86_64 #1
  "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  sshd          D 000000000000000e     0  6425   6418 0x00000080
   ffff88032926f768 0000000000000086 0000000000000000 0000000000000000
   ffff88032926f848 ffffffff8105a924 ffff88032926f7e8 ffff88032926f758
   ffff8803262625f8 ffff88032926ffd8 000000000000fbc8 ffff8803262625f8
  Call Trace:
   [<ffffffff81528dd5>] schedule_timeout+0x215/0x2e0
   [<ffffffff81528a53>] wait_for_common+0x123/0x180
   [<ffffffff81528b6d>] wait_for_completion+0x1d/0x20
   [<ffffffff81095927>] flush_work+0x77/0xc0
   [<ffffffff81095b44>] flush_delayed_work+0x54/0x70
   [<ffffffff8133b525>] tty_flush_to_ldisc+0x15/0x20
   [<ffffffff81336197>] n_tty_poll+0x67/0x1d0
   [<ffffffff81331cda>] tty_poll+0x8a/0xa0
   [<ffffffff811a0c92>] do_select+0x392/0x6c0
   [<ffffffff811a114a>] core_sys_select+0x18a/0x2c0
   [<ffffffff811a14d7>] sys_select+0x47/0x110
   [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
  

  or:

  INFO: task mingetty:5371 blocked for more than 120 seconds.
        Not tainted 2.6.32-504.1.3.el6.x86_64 #1
  "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  mingetty      D 0000000000000008     0  5371      1 0x00000080
   ffff880439c81b88 0000000000000086 0000000000000000 ffff8804bc549087
   ffff880439c81b78 ffffffff812966a0 0000002debbb7c24 0000000100000001
   ffffffffffffffff 00000000fffe3a75 ffff88043a08b098 ffff880439c81fd8
  Call Trace:
   [<ffffffff8152a8e5>] schedule_timeout+0x215/0x2e0
   [<ffffffff8152a563>] wait_for_common+0x123/0x180
   [<ffffffff8152a67d>] wait_for_completion+0x1d/0x20
   [<ffffffff810983b1>] flush_cpu_workqueue+0x61/0x90
   [<ffffffff81098e84>] flush_workqueue+0x54/0x80
   [<ffffffff81098ec5>] flush_scheduled_work+0x15/0x20
   [<ffffffff813383bc>] tty_ldisc_release+0x3c/0x90
   [<ffffffff813326db>] tty_release_dev+0x40b/0x5e0
   [<ffffffff813328ce>] tty_release+0x1e/0x30
   [<ffffffff8118f8d5>] __fput+0xf5/0x210
   [<ffffffff8118fa15>] fput+0x25/0x30
   [<ffffffff8118ac6d>] filp_close+0x5d/0x90
   [<ffffffff8118ad45>] sys_close+0xa5/0x100
   [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b