I'm experiencing the exact same issue:
PostgreSQL 9.1.6 on i686-pc-linux-gnu, compiled by gcc (GCC) 4.4.6 20120305
(Red Hat 4.4.6-4), 32-bit
CentOS release 6.3 (Final)
I might also turn full_page_writes off but I fear for data integrity in case
of a crash .....
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