"khungtaskd" triggered kernel panic while a "khugepaged" process waiting to get the semaphore lock.
Issue
- Kernel panic with following call traces.
INFO: task khugepaged:60 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
khugepaged D 0000000000000003 0 60 2 0x00000000
ffff880631f59c88 0000000000000046 0000000000000000 ffff880631f59c10
ffff880028396700 0000000000000000 0000000000000000 0000000000016700
ffff880631f0e5f8 ffff880631f59fd8 000000000000fb88 ffff880631f0e5f8
Call Trace:
[<ffffffff810096f0>] ? __switch_to+0xd0/0x320
[<ffffffff810810cc>] ? lock_timer_base+0x3c/0x70
[<ffffffff81510695>] rwsem_down_failed_common+0x95/0x1d0
[<ffffffff81510826>] rwsem_down_read_failed+0x26/0x30
[<ffffffff810811e0>] ? process_timeout+0x0/0x10
[<ffffffff81283844>] call_rwsem_down_read_failed+0x14/0x30
[<ffffffff8150fd24>] ? down_read+0x24/0x30
[<ffffffff81179c1f>] khugepaged+0x18f/0x1310
[<ffffffff81096da0>] ? autoremove_wake_function+0x0/0x40
[<ffffffff81179a90>] ? khugepaged+0x0/0x1310
[<ffffffff81096a36>] kthread+0x96/0xa0
[<ffffffff8100c0ca>] child_rip+0xa/0x20
[<ffffffff810969a0>] ? kthread+0x0/0xa0
[<ffffffff8100c0c0>] ? child_rip+0x0/0x20
Kernel panic - not syncing: hung_task: blocked tasks
Pid: 57, comm: khungtaskd Tainted: P --------------- 2.6.32-358.18.1.el6.x86_64 #1
Call Trace:
[<ffffffff8150da18>] ? panic+0xa7/0x16f
[<ffffffff810e0bd7>] ? watchdog+0x217/0x220
[<ffffffff810e09c0>] ? watchdog+0x0/0x220
[<ffffffff81096a36>] ? kthread+0x96/0xa0
[<ffffffff8100c0ca>] ? child_rip+0xa/0x20
[<ffffffff810969a0>] ? kthread+0x0/0xa0
[<ffffffff8100c0c0>] ? child_rip+0x0/0x20
Environment
- Red Hat Enterprise Linux 6
- kernel-2.6.32-358.18.1.el6
- khugepaged
- khungtaskd
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.
Close
Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.