System crashed with mpath_prio_alua in D state.

Issue

• System crashed with mpath_prio_alua in D state.

    Sep 28 01:03:28 hostname1 kernel: INFO: task mpath_prio_alua:21480 blocked for more than 120 seconds.
    Sep 28 01:03:28 hostname1 kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    Sep 28 01:03:28 hostname1 kernel: mpath_prio_al D ffff81014a0fb040     0 21480   8587                     (NOTLB)
    Sep 28 01:03:28 hostname1 kernel:  ffff8103ccae3a28 0000000000000086 ffff8102af24c4f8 ffff8103e1ec4800
    Sep 28 01:03:28 hostname1 kernel:  ffff8102af24c4f8 0000000000000001 ffff81040c891100 ffff81014a0fb040
    Sep 28 01:03:28 hostname1 kernel:  0000c1d0c428ba8f 0000000000066a38 ffff81040c8912e8 000000032fbe86f0
    Sep 28 01:03:28 hostname1 kernel: Call Trace:
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff801432ef>] elv_next_request+0x168/0x178
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff80063167>] wait_for_completion+0x79/0xa2
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff8008cfa1>] default_wake_function+0x0/0xe
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff80144fb3>] blk_execute_rq_nowait+0x86/0x9a
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff8014505f>] blk_execute_rq+0x98/0xc0
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff80148a2a>] sg_io+0x258/0x356
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff80148faf>] scsi_cmd_ioctl+0x1d2/0x3b5
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff8000aadf>] get_page_from_freelist+0x378/0x43a
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff8000cec8>] do_lookup+0x65/0x1e6
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff880a90a0>] :sd_mod:sd_ioctl+0x93/0xc2
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff80146ac8>] blkdev_driver_ioctl+0x5d/0x72
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff80147119>] blkdev_ioctl+0x63c/0x697
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff800e54a6>] do_open+0x250/0x30f
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff80022176>] __up_read+0x19/0x7f
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff80066b88>] do_page_fault+0x4fe/0x874
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff800e4b39>] block_ioctl+0x1b/0x1f
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff800420be>] do_ioctl+0x21/0x6b
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff80030175>] vfs_ioctl+0x457/0x4b9
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff800b7605>] audit_syscall_entry+0x180/0x1b3
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff8004c5a4>] sys_ioctl+0x59/0x78
    Sep 28 01:03:28 hostname1 kernel:  [<ffffffff8005d28d>] tracesys+0xd5/0xe0
    Sep 28 01:03:28 hostname1 kernel: 
    Sep 28 01:06:15 hostname1 syslogd 1.4.1: restart.
    Sep 28 01:06:15 hostname1 kernel: klogd 1.4.1, log source = /proc/kmsg started.
    Sep 28 01:06:15 hostname1 kernel: Linux version 2.6.18-194.11.1.el5 (user1@hostname2) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48))