The kernel got hung up with a message "INFO: task acfssnap0:<PID> blocked for more than 120 seconds."

Issue

• The kernel got hung up with a message "INFO: task acfssnap0: blocked for more than 120 seconds."

Nov 29 01:03:50 localhost err kernel: INFO: task acfssnap0:<PID> blocked for more than 120 seconds.
Nov 29 01:03:50 localhost err kernel:      Tainted: P           ---------------    2.6.32-504.3.3.el6.x86_64 #1
Nov 29 01:03:50 localhost err kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Nov 29 01:03:50 localhost info kernel: acfssnap0     D 0000000000000000     0 15318      2 0x00000080
Nov 29 01:03:50 localhost warning kernel: ffff880342bd7ad0 0000000000000046 0000000000000000 00000000042f0e00
Nov 29 01:03:50 localhost warning kernel: ffff880342a48000 00000000042f0e00 000dd2984c47eea3 ffffffffa03885b7
Nov 29 01:03:50 localhost warning kernel: ffff880342bd7a60 00000001e7cd94c7 ffff880340918638 ffff880342bd7fd8
Nov 29 01:03:50 localhost warning kernel: Call Trace:
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa03885b7>] ? ofs_meta_get_int+0x24e7/0x3560 [oracleacfs]
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa0479e75>] OfsWaitEvent+0x225/0x290 [oracleacfs]
Nov 29 01:03:50 localhost warning kernel: [<ffffffff81064b90>] ? default_wake_function+0x0/0x20
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa0390bec>] OfsCondWaitTimeout+0x7c/0x410 [oracleacfs]
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa03913d5>] OfsCondWait+0x15/0x20 [oracleacfs]
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa035edc7>] OfsAcquireDLMLock_int+0x777/0x2be0 [oracleacfs]
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa03523b0>] ? ofs_dlm_blkrtn+0x0/0x170 [oracleacfs]
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa03620bd>] OfsAcquireSystemFileLock_int+0x12d/0x180 [oracleacfs]
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa0248f9e>] ? KsMalloc+0x13e/0x220 [oracleoks]
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa038ddc5>] OfsLockSB_Data+0x25/0xa0 [oracleacfs]
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa045aa09>] OfsUpdateVCBVersion+0x49/0x1c0 [oracleacfs]
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa03c142a>] OfsSnapThread+0xada/0x40e0 [oracleacfs]
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa03c0950>] ? OfsSnapThread+0x0/0x40e0 [oracleacfs]
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa03c0950>] ? OfsSnapThread+0x0/0x40e0 [oracleacfs]
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa024a19f>] KsKthreadRun+0x7f/0xb0 [oracleoks]
Nov 29 01:03:50 localhost warning kernel: [<ffffffff8100c20a>] child_rip+0xa/0x20
Nov 29 01:03:50 localhost warning kernel: [<ffffffffa024a120>] ? KsKthreadRun+0x0/0xb0 [oracleoks]
Nov 29 01:03:50 localhost warning kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20
Nov 29 01:03:50 localhost err kernel: INFO: task acfssnap1:15344 blocked for more than 120 seconds.