Centos 5.6 Kernel Panics

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Hello,

Recently our dell sc1425 server has been locking up with kernel freezes 
and required a hard reboot on each occasion. I've looked on the centos 
forums with limited success - each problem seems slightly different 
(some failure on high load, some not). Our kernel is 2.6.18-274.17.1.el5 
and /var/log/messages show the following errors:

Apr  3 12:41:25 sp2 kernel: INFO: task mysqld:15345 blocked for more 
than 120 seconds.
Apr  3 12:41:25 sp2 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Apr  3 12:41:25 sp2 kernel: mysqld        D 00000CEB  2524 15345  32083 
         15346 15167 (NOTLB)
Apr  3 12:41:25 sp2 kernel:        c50c7f54 00000082 bf379c08 00000ceb 
ca9b1648 f43c6c5c 00000000 00000001
Apr  3 12:41:25 sp2 kernel:        d9d18000 bf384f01 00000ceb 0000b2f9 
00000001 d9d1810c c2013ac4 edc5de40
Apr  3 12:41:25 sp2 kernel:        08515c98 c6cb37b8 c2014464 c200cc80 
00000020 00000000 00000000 00000000
Apr  3 12:41:25 sp2 kernel: Call Trace:
Apr  3 12:41:25 sp2 kernel:  [<c0622f16>] 
rwsem_down_write_failed+0x126/0x141
Apr  3 12:41:25 sp2 kernel:  [<c0439989>] .text.lock.rwsem+0x2b/0x3a
Apr  3 12:41:25 sp2 kernel:  [<c046aa6a>] sys_mprotect+0xbd/0x1eb 

Apr  3 12:41:25 sp2 kernel:  [<c0404f4b>] syscall_call+0x7/0xb 

Apr  3 12:41:25 sp2 kernel:  =======================
Apr  3 12:41:25 sp2 kernel: INFO: task clamd:15721 blocked for more than 
120 seconds.
Apr  3 12:41:26 sp2 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Apr  3 12:41:26 sp2 kernel: clamd         D 00000D49  2528 15721      1 
         16416 15449 (NOTLB)
Apr  3 12:41:26 sp2 kernel:        e848cf74 00000086 8f107b57 00000d49 
30ea2005 e848cf44 c08259d0 00000007
Apr  3 12:41:26 sp2 kernel:        e8c6aaa0 8f117848 00000d49 0000fcf1 
00000000 e8c6abac c200cc80 f4f5f3c0
Apr  3 12:41:26 sp2 kernel:        c041f863 00000184 c200d620 c2013ac4 
00000020 00000000 d887f0a8 f766f0c0
Apr  3 12:41:26 sp2 kernel: Call Trace:
Apr  3 12:41:26 sp2 kernel:  [<c041f863>] default_wake_function+0x0/0xc
Apr  3 12:41:26 sp2 kernel:  [<c048e994>] destroy_inode+0x38/0x47
Apr  3 12:41:26 sp2 kernel:  [<c0622f16>] 
rwsem_down_write_failed+0x126/0x141
Apr  3 12:41:26 sp2 kernel:  [<c0439989>] .text.lock.rwsem+0x2b/0x3a
Apr  3 12:41:26 sp2 kernel:  [<c046a32b>] sys_munmap+0x24/0x41 

Apr  3 12:41:26 sp2 kernel:  [<c0404f4b>] syscall_call+0x7/0xb

Any advice would be appreciated.

regards,

Jon
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