try gdb --args ./pg_upgrade -d /var/pgsql-8_4_3/data/ -D /var/pgsql-9_0_1/data/ -b /var/pgsql-8_4_3/bin/ -B /var/pgsql-9_0_1/bin/ --check -P 5433 -v -g -G debug and when it fails, type in 'bt' and paste it here please.
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