Disable elog(ERROR|FATAL) in signal handlers in

src/backend/access/heap/heapam.c

src/backend/access/nbtree/nbtinsert.c

src/backend/access/nbtree/nbtpage.c

src/backend/access/transam/xact.c

src/backend/access/transam/xlog.c

src/backend/commands/sequence.c

src/backend/commands/vacuum.c

src/backend/tcop/postgres.c

src/backend/utils/error/elog.c

src/include/access/xlog.h

src/include/tcop/tcopprot.h

src/include/utils/elog.h