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Description of problem:
This morning I couldn't log into my server (ssh), open xterm-windows and samba
didn't work. The machine replied to ping, but nothing else.
I was forced to boot. After that I looked into /var/log/messages
(timestamp information removed):

May 31 04:02:39 pullasorsa kernel: ------------[ cut here ]------------
kernel: kernel BUG at vmscan.c:118!
kernel: invalid operand: 0000
kernel: loop ip_nat_irc ip_conntrack_irc ip_nat_ftp ip_conntrack_ftp autofs
3c59x ipt_REJECT
 ipt_limit ipt_LOG ipt_state iptable_nat ip_conntrack iptable_filter ip_ta
kernel: CPU:    0
kernel: EIP:    0060:[<c0135fc0>]    Not tainted
kernel: EFLAGS: 00010206
kernel:
kernel: EIP is at reclaim_page [kernel] 0x2a0 (2.4.20-9)
kernel: eax: 010c020c   ebx: c1292a48   ecx: 00000100   edx: 0000059d
kernel: esi: c02ec860   edi: c1292a2c   ebp: 0000052a   esp: cf6cbe68
kernel: ds: 0068   es: 0068   ss: 0068
kernel: Process rpmq (pid: 6516, stackpage=cf6cb000)
kernel: Stack: c02eca44 00000000 c02ec860 c02ecdc4 00000003 00000001 c0138da0
c02ecdcc
kernel:        0000031f 000001d2 00000000 c0138e61 c02ecdc0 00000000 00000003
00000001
kernel:        c124968c c7859148 c124968c c124968c 00000001 c02ecdc0 c7859148
0000190d
kernel: Call Trace:   [<c0138da0>] __alloc_pages_limit [kernel] 0x70 (0xcf6cbe80))
kernel: [<c0138e61>] __alloc_pages [kernel] 0xa1 (0xcf6cbe94))
kernel: [<c012e5b0>] page_cache_read [kernel] 0x80 (0xcf6cbed0))
kernel: [<c012edcb>] generic_file_readahead [kernel] 0xdb (0xcf6cbee8))
kernel: [<c012f253>] do_generic_file_read [kernel] 0x353 (0xcf6cbf10))
kernel: [<c012f610>] file_read_actor [kernel] 0x0 (0xcf6cbf3c))
kernel: [<c012f732>] generic_file_read [kernel] 0x82 (0xcf6cbf5c))
kernel: [<c012f610>] file_read_actor [kernel] 0x0 (0xcf6cbf6c))
kernel: [<c013ff92>] sys_pread [kernel] 0xa2 (0xcf6cbf94))
kernel: [<c0109103>] system_call [kernel] 0x33 (0xcf6cbfc0))
kernel:
kernel:
kernel: Code: 0f 0b 76 00 e1 f9 23 c0 e9 9f fd ff ff 8d 76 00 57 56 ba 01
kernel:  ------------[ cut here ]------------


As I look into other messages file, I can see that this did happen
once before, May 16. The time, messages and process are exactly the same.

There is a cron job in cron.daily which caused this to happen:
[root@pullasorsa cron.daily]# cat rpm
#!/bin/sh
rpm -qa --qf '%{name}-%{version}-%{release}.%{arch}.rpm\n' 2>&1 \
        | sort > /var/log/rpmpkgs

The rpm package version is:
[root@pullasorsa cron.daily]# rpm -q rpm
rpm-4.2-0.69



Version-Release number of selected component (if applicable):
2.4.20-9

How reproducible:
Couldn't Reproduce


Additional info:

I had some crashes before this bug (reported as bug # 90990) so I run memtest86
for about 48 hours (all test and only standard set of tests) and it couldn't
find anything. I'm not sure if this is related to it.

Atleast these crashes seem to happen when there are lot of disk activity (see
bug 90990: backup script, samba, rpm, updatedb). I did shutdown the machine with
-F to force fsck on reboot. It didn't find anything wrong with hard drives.