@Malafaya reported on IRC that the following page: https://mg.wiktionary.org/wiki/franciu?uselang=en crashes their bot. It looks like the page exists (https://mg.wiktionary.org/w/index.php?title=franciu&action=info&uselang=en), but has no revisions. No idea what happened here, but if the revisions existed and then disappeared, that looks like a data loss bug.
Reported by @DannyS712 at T220281
Currently, there are 16 pages on enwiki that exist in the page table but have no entries in the revision table, and can neither be created nor deleted on wikipedia. See https://quarry.wmflabs.org/query/34936 and https://en.wikipedia.org/wiki/Wikipedia:Village_pump_(miscellaneous)#Pages_that_don't_exist for more. Can they be fixed/deleted/restored?
Possible causes of this:
- T135852: Failed restore and data loss on ar_rev_id collisions (if there are no other revisions after the restore fails).
- T220281 Looks like it's left over from an incident back in 2012-06-11. The external store master went down and it looks like between about 23:38:47 UTC and 23:52:37 UTC revisions couldn't be created because the revision content couldn't be saved. Apparently attempted page creations during that time created the page row despite failing to create the initial revision. @Anomie