Linux black screen problem with kernel 2.6.16.23 -- out of (low) memory?

[Robinson Tiemuqinke <hahaha_30k@yahoo.com>]

Hi,

 I compiled valnilla kernel 2.6.16.23 on 64bit Fedora
Core 4 months ago. 

 the kernels runs well for a lot of machines for
months but weeks ago 4 machines dead with a black
screen, we could ping them but failed to ssh into
them.

 After power-cycled the 4 machines, I have found the
following in the /var/log/messages. -- it looks that
there were still enough free memory, though.

 Please help explain the output, and possibly what's
the correct way to fix/workaround it. Thanks a lot.

Aug  6 00:10:56 node2001 kernel: oom-killer:
gfp_mask=0xd0, order=1
Aug  6 00:10:56 node2001 kernel:
Aug  6 00:10:56 node2001 kernel: Call Trace:
<ffffffff80166807>{out_of_memory+55}
<ffffffff8016905c>{__alloc_pages+604}
Aug  6 00:10:56 node2001 kernel:       
<ffffffff8016872e>{__get_free_pages+14}
<ffffffff80136f65>{copy_process+261}
Aug  6 00:10:56 node2001 kernel:       
<ffffffff80119abf>{flush_tlb_mm+223}
<ffffffff80171104>{free_pgtables+148}
Aug  6 00:10:56 node2001 kernel:       
<ffffffff80138475>{do_fork+261}
<ffffffff8010ad1e>{system_call+126}
Aug  6 00:10:56 node2001 kernel:       
<ffffffff8010b02b>{ptregscall_common+103}
Aug  6 00:10:56 node2001 kernel: Mem-info:
Aug  6 00:10:56 node2001 kernel: Node 0 DMA per-cpu:
Aug  6 00:10:56 node2001 kernel: cpu 0 hot: high 0,
batch 1 used:0
Aug  6 00:10:56 node2001 kernel: cpu 0 cold: high 0,
batch 1 used:0
Aug  6 00:10:56 node2001 kernel: Node 0 DMA32 per-cpu:
Aug  6 00:10:56 node2001 kernel: cpu 0 hot: high 186,
batch 31 used:83
Aug  6 00:10:57 node2001 kernel: cpu 0 cold: high 62,
batch 15 used:61
Aug  6 00:10:58 node2001 kernel: Node 0 Normal
per-cpu: empty
Aug  6 00:10:58 node2001 kernel: Node 0 HighMem
per-cpu: empty
Aug  6 00:10:59 node2001 kernel: Free pages:    
3266788kB (0kB HighMem)
Aug  6 00:10:59 node2001 kernel: Active:1227
inactive:8695 dirty:0 writeback:7947 unstable:0
free:816697 slab:4935 mapped:1238 pagetables:604
Aug  6 00:10:59 node2001 kernel: Node 0 DMA
free:10576kB min:20kB low:24kB high:28kB active:0kB
inactive:0kB present:10216kB pages_scanned:26164
all_unreclaimable? yes
Aug  6 00:10:59 node2001 kernel: lowmem_reserve[]: 0
3266 3266 3266


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