Some time ago, a customer came to us with a strange vacuuming problem. Their regular vacuum job would die with a message such as this one:
vacuumdb: vacuuming of database "clint_app" failed: ERROR: failed to re-find parent key in index "work_items_pkey" for deletion target page 6100
Eventually, it turned out that their storage firmware had some glitch that caused things to go wrong in random ways, and corruption in various …