Lots of process in D state at synchronize_sched+0x58

Issue

• System shows lots of hung tasks

seos: applying 16k kernel stack fix up
seos: applying 16k kernel stack fix up
SEOS Syscall Monitor - ACTIVATED
INFO: task crond:16580 blocked for more than 120 seconds.
      Tainted: P           -- ------------    2.6.32-573.7.1.el6.x86_64 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
crond         D 000000000000000b     0 16580   7986 0x00000000
 ffff884025e33d38 0000000000000086 0000000000000000 0000000100000001
 ffff884080010dc0 ffffffff81b0c850 0001f42d9e8ec410 0000000000000001
 0000000000000001 0000000120bdf016 ffff884023fff068 ffff884025e33fd8
Call Trace:
 [<ffffffff81539445>] schedule_timeout+0x215/0x2e0
 [<ffffffff81335943>] ? extract_entropy+0x63/0x1f0
 [<ffffffff815390c3>] wait_for_common+0x123/0x180
 [<ffffffff810672b0>] ? default_wake_function+0x0/0x20
 [<ffffffff815391dd>] wait_for_completion+0x1d/0x20
 [<ffffffff8109ccd8>] synchronize_sched+0x58/0x60
 [<ffffffff8109cc60>] ? wakeme_after_rcu+0x0/0x20
 [<ffffffff8122dbbc>] install_session_keyring_to_cred+0x6c/0xd0
 [<ffffffff8122dd53>] join_session_keyring+0x133/0x160
 [<ffffffff8122c908>] keyctl_join_session_keyring+0x38/0x70
 [<ffffffff8122d590>] sys_keyctl+0x180/0x1a0
 [<ffffffff8100b0d2>] system_call_fastpath+0x16/0x1b