Memory problem?

I have a server running CentOS4 (current) with qmail that's been running
fine for months. This morning the system 'froze', and after a hard reboot I
see this is what happened in the syslog:

Jan  3 09:14:26 shem kernel: oom-killer: gfp_mask=0x1d2
Jan  3 09:14:26 shem kernel: Mem-info:
Jan  3 09:14:26 shem kernel: DMA per-cpu:
Jan  3 09:14:26 shem kernel: cpu 0 hot: low 2, high 6, batch 1
Jan  3 09:14:26 shem kernel: cpu 0 cold: low 0, high 2, batch 1
Jan  3 09:14:26 shem kernel: Normal per-cpu:
Jan  3 09:14:26 shem kernel: cpu 0 hot: low 18, high 54, batch 9
Jan  3 09:14:26 shem kernel: cpu 0 cold: low 0, high 18, batch 9
Jan  3 09:14:26 shem kernel: HighMem per-cpu: empty
Jan  3 09:14:26 shem kernel:
Jan  3 09:14:26 shem kernel: Free pages:         388kB (0kB HighMem)
Jan  3 09:14:26 shem kernel: Active:17306 inactive:12408 dirty:0 writeback:0
unstable:0 free:97 slab:3797 mapped:30692 pagetables:3563
Jan  3 09:14:35 shem kernel: DMA free:40kB min:40kB low:80kB high:120kB
active:8376kB inactive:12kB present:16384kB pages_scanned:14146
all_unreclaimable? yes
Jan  3 09:14:42 shem kernel: protections[]: 0 0 0
Jan  3 09:14:42 shem kernel: Normal free:348kB min:360kB low:720kB
high:1080kB active:60848kB inactive:49620kB present:147456kB
pages_scanned:499686 all_unreclaimable? yes
Jan  3 09:14:42 shem kernel: protections[]: 0 0 0
Jan  3 09:14:42 shem kernel: HighMem free:0kB min:128kB low:256kB high:384kB
active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
Jan  3 09:14:42 shem kernel: protections[]: 0 0 0
Jan  3 09:14:42 shem kernel: DMA: 0*4kB 1*8kB 0*16kB 1*32kB 0*64kB 0*128kB
0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 40kB
Jan  3 09:14:42 shem kernel: Normal: 1*4kB 3*8kB 2*16kB 3*32kB 1*64kB
1*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB =
348kB
Jan  3 09:14:42 shem kernel: HighMem: empty
Jan  3 09:14:42 shem kernel: Swap cache: add 2633082, delete 2632716, find
2865709/3239978, race 1+26
Jan  3 09:14:42 shem kernel: 0 bounce buffer pages
Jan  3 09:14:42 shem kernel: Free swap:            0kB
Jan  3 09:14:42 shem kernel: 40960 pages of RAM
Jan  3 09:14:42 shem kernel: 0 pages of HIGHMEM
Jan  3 09:14:42 shem kernel: 1326 reserved pages
Jan  3 09:14:42 shem kernel: 41362 pages shared
Jan  3 09:14:42 shem kernel: 366 pages swap cached
Jan  3 09:14:42 shem kernel: Out of Memory: Killed process 528 (mysqld).
Jan  3 09:14:42 shem kernel: oom-killer: gfp_mask=0x1d2
... more of the same ...

Apparently ran out of memory? Is there possibly a memory leak somewhere, or
possibly memory going bad?

After rebooting, top shows:
Mem:    158600k total,   143860k used,    14740k free,     3244k buffers
Swap:   327672k total,     4128k used,   323544k free,    29040k cached

TIA for any insights/suggestions.

--
-Eric 'shubes'
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