Why kmem_cache_free occupy CPU for more than 10 seconds?

["Zhao Forrest" <forrest.zhao@gmail.com>]

Hi,

We're using RHEL5 with kernel version 2.6.18-8.el5.
When doing a stress test on raw device for about 3-4 hours, we found
the soft lockup message in dmesg.
I know we're not reporting the bug on the latest kernel, but does any
expert know if this is the known issue in old kernel? Or why
kmem_cache_free occupy CPU for more than 10 seconds?

Please let me know if you need any information.

Thanks,
Forrest
--------------------------------------------------------------
BUG: soft lockup detected on CPU#1!

Call Trace:
<IRQ>  [<ffffffff800b2c93>] softlockup_tick+0xdb/0xed
[<ffffffff800933df>] update_process_times+0x42/0x68
[<ffffffff80073d97>] smp_local_timer_interrupt+0x23/0x47
[<ffffffff80074459>] smp_apic_timer_interrupt+0x41/0x47
[<ffffffff8005bcc2>] apic_timer_interrupt+0x66/0x6c
<EOI>  [<ffffffff80007660>] kmem_cache_free+0x1c0/0x1cb
[<ffffffff800262ee>] free_buffer_head+0x2a/0x43
[<ffffffff80027110>] try_to_free_buffers+0x89/0x9d
[<ffffffff80043041>] invalidate_mapping_pages+0x90/0x15f
[<ffffffff800d4a77>] kill_bdev+0xe/0x21
[<ffffffff800d4f9d>] __blkdev_put+0x4f/0x169
[<ffffffff80012281>] __fput+0xae/0x198
[<ffffffff80023647>] filp_close+0x5c/0x64
[<ffffffff800384f9>] put_files_struct+0x6c/0xc3
[<ffffffff80014f01>] do_exit+0x2d2/0x8b1
[<ffffffff80046eb6>] cpuset_exit+0x0/0x6c
[<ffffffff8002abd7>] get_signal_to_deliver+0x427/0x456
[<ffffffff80059122>] do_notify_resume+0x9c/0x7a9
[<ffffffff80086c6d>] default_wake_function+0x0/0xe
[<ffffffff800b1fd8>] audit_syscall_exit+0x2cd/0x2ec
[<ffffffff8005b362>] int_signal+0x12/0x17
--------------------------------------------------------------
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