I've logged in with old password.
I've been taken immediately to page to change the password claiming the password is invalid due to not being at least 10 chars long.
I've filled old password, new (valid) password and its confirmation and hit the submit button.
I've got the https://wikitech.wikimedia.org/wiki/Special:ChangePassword page with folowing message:
A database query error has occurred. This may indicate a bug in the software.Function: BotPassword::invalidateAllPasswordsForCentralId Error: 1146 Table 'labswiki.bot_passwords' doesn't exist (220.127.116.11)
"wgHostname":"silver" if that helps.