Hey All,
I am not 100% percent sure this is a kernel problem - but suspect it is.
If not guidance in the right direction would be appreciated. I would
also appreciate a cc on any replies.
Right. At my place of work we are running a dual Xeon machine with 2 gig
of RAM. It is running Redhat 7.2 with the 2.4.17 kernel with the ACL
patches applied. The problem is this: every so often the machine hangs
dead: no services, no terminal input, no pings no nothing.
After a clean reboot we see the following in the messages file:
May 29 12:14:21 medusa rpc.mountd: authenticated mount request from
172.25.130.14:764 for /taitdata/ecad/home (/taitdata/ecad)
May 29 12:15:36 medusa kernel: invalid operand: 0000
May 29 12:15:36 medusa kernel: CPU: 0
May 29 12:15:36 medusa kernel: EIP: 0010:[__free_pages_ok+80/512]
Not tainted
May 29 12:15:36 medusa kernel: EIP: 0010:[<c012fd20>] Not tainted
May 29 12:15:36 medusa kernel: EFLAGS: 00010202
May 29 12:15:36 medusa kernel: eax: 00000040 ebx: 00000000 ecx:
c1000000 edx: 00000000
May 29 12:15:36 medusa kernel: esi: c17fff00 edi: dfffc000 ebp:
00000000 esp: f7ee1ef4
May 29 12:15:36 medusa kernel: ds: 0018 es: 0018 ss: 0018
May 29 12:15:36 medusa kernel: Process kswapd (pid: 5, stackpage=f7ee1000)
May 29 12:15:36 medusa kernel: Stack: c1040000 c02749e0 00000202
ffffffff c200bbd0 00000000 dfffc000 d8289de0
May 29 12:15:36 medusa kernel: c012d5fd ffffffff c200bbd0
00000000 c200b060 f57a1340 c012e85c c200bbd0
May 29 12:15:36 medusa kernel: d8289de0 00000001 c200bbd8
c200bbe0 c0274a70 f7ee0000 00000000 00000007
May 29 12:15:36 medusa kernel: Call Trace: [kmem_slab_destroy+173/208]
[kmem_cache_reap+668/784] [shrink_caches+25/144]
[try_to_free_pages+60/96] [kswapd_balance_pgdat+81/160]
May 29 12:15:36 medusa kernel: Call Trace: [<c012d5fd>] [<c012e85c>]
[<c012f7c9>] [<c012f87c>] [<c012f921>]
May 29 12:15:36 medusa kernel: [kswapd_balance+38/64]
[kswapd+161/192] [kswapd+0/192] [_stext+0/64] [kernel_thread+38/48]
[kswapd+0/192]
May 29 12:15:36 medusa kernel: [<c012f996>] [<c012fad1>] [<c012fa30>]
[<c0105000>] [<c0105826>] [<c012fa30>]
May 29 12:15:36 medusa kernel:
May 29 12:15:36 medusa kernel: Code: 0f 0b 8b 46 18 a9 80 00 00 00 74 02
0f 0b 83 66 18 eb b8 00
May 29 12:15:37 medusa rpc.mountd: authenticated unmount request from
172.25.142.10:759 for /taitdata/ecad/home (/taitdata/ecad)
May 29 12:44:38 medusa syslogd 1.4.1: restart.
The restart was caused by us hitting the power button, not by the system
hang.
Any insights into why this is happening? One of the solutions proposed
is to throw more RAM at the problem - although I think finding the cause
of the problem will be much more beneficial.
Cheers for any help,
James Sewell
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