Query Failed, out of memory

I am using the netflix database:
Table "public.ratings"
Column | Type | Modifiers
--------+----------+-----------
item | integer |
client | integer |
day | smallint |
rating | smallint |

The query was executed as:
psql -p 5435 -U pgsql -t -A -c "select client, item, rating, day from
ratings order by client" netflix > netflix.txt

My question, it looks like the kernel killed psql, and not postmaster. The
postgresql log file complained about a broken pipe.

Question, is this a bug in psql? It took over 4 hours of run time before
the crash.

dmesg:
Free pages: 13192kB (112kB HighMem)
Active:124664 inactive:124330 dirty:0 writeback:0 unstable:0 free:3298
slab:2188 mapped:248080 pagetables:1939
DMA free:12160kB min:16kB low:32kB high:48kB active:0kB inactive:0kB
present:16384kB pages_scanned:12602 all_unreclaimable? yes
protections[]: 0 0 0
Normal free:920kB min:928kB low:1856kB high:2784kB active:438608kB
inactive:437656kB present:901120kB pages_scanned:978318 all_unreclaimable?
yes
protections[]: 0 0 0
HighMem free:112kB min:128kB low:256kB high:384kB active:60176kB
inactive:59536kB present:131008kB pages_scanned:134673 all_unreclaimable?
yes
protections[]: 0 0 0
DMA: 6*4kB 3*8kB 3*16kB 3*32kB 3*64kB 2*128kB 1*256kB 0*512kB 1*1024kB
1*2048kB 2*4096kB = 12160kB
Normal: 0*4kB 1*8kB 7*16kB 1*32kB 0*64kB 0*128kB 1*256kB 1*512kB 0*1024kB
0*2048kB 0*4096kB = 920kB
HighMem: 0*4kB 0*8kB 1*16kB 1*32kB 1*64kB 0*128kB 0*256kB 0*512kB 0*1024kB
0*2048kB 0*4096kB = 112kB
Swap cache: add 548633, delete 548633, find 11883/13748, race 0+0
0 bounce buffer pages
Free swap: 0kB
262128 pages of RAM
32752 pages of HIGHMEM
3593 reserved pages
608 pages shared
0 pages swap cached
Out of Memory: Killed process 9143 (psql).