psql Segmentation fault

bash-3.2$ /opt/PostgreSQL/9.1/bin/psql -p 5433
psql.bin (9.1.1)
Type "help" for help.
/opt/PostgreSQL/9.1/bin/psql: line 30: 25199 Segmentation fault      LD_LIBRARY_PATH=$PG_BIN_PATH/../lib:$LD_LIBRARY_PATH "$PG_BIN_PATH/psql.bin" "$@"

So remove some  contents in the .psql_history file and then restart instance.