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
Environment
- Red Hat Enterprise Linux 6
- seos.ko is loaded
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