How to deal with redundant block
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	Bugreporter
	Nov 17 2023, 11:47 AM

Description

For example a user be indef blocked twice.

AbuseFilter may automatically issue block, and if talk page access is not revoked, new blocks can be issued even if the user is blocked (by abusefilter or others).
User may deliberately generate a large number of abusefilter blocks, and if the number of blocks on one user is unlimited (cf T351508: Decide the limit of multiblocks), potentially we may run into performance issues.
This will be more a problem once T201815: Implement partial blocks in AbuseFilter as they'll be available is resolved.

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Status	Subtype	Assigned	Task
Resolved		• JWheeler-WMF	T366388 Multiblocks: Edit and Remove a block
Resolved		dmaza	T349689 Admins should be able to edit an active block without needing to delete it first
Open		None	T204903 Epic ⚡️ unprioritized Partial Blocks features
Open	BUG REPORT	None	T25310 Global suppression does not work properly when the target has already been locally blocked
Resolved		• JWheeler-WMF	T194697 Multiblocks — Allow for multiple, simultaneous blocks with different expiration dates
Open		None	T351511 How to deal with redundant block

Event Timeline

Bugreporter created this task.Nov 17 2023, 11:47 AM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptNov 17 2023, 11:47 AM

Bugreporter mentioned this in T351512: Support multi-block in UserMerge properly.Nov 17 2023, 11:49 AM

• JWheeler-WMF moved this task from Backlog to Descoped on the Multiblocks board.May 23 2024, 9:30 PM

Restricted Application added a project: Community-Tech. · View Herald TranscriptMay 23 2024, 9:30 PM

• JWheeler-WMF removed a project: Community-Tech.May 23 2024, 9:32 PM

• JWheeler-WMF mentioned this in T390913: SPIKE: 1 day: Investigate interactivity of abusefilter and multiblocks.Apr 2 2025, 9:21 PM

MusikAnimal added a project: AbuseFilter.Apr 3 2025, 1:02 AM

Restricted Application added a project: Trust and Safety Product Team. · View Herald TranscriptApr 3 2025, 1:02 AM

MusikAnimal mentioned this in T390528: Multiple blocks by AbuseFilter without Multiblocks enabled.Apr 3 2025, 2:08 AM

Dreamy_Jazz moved this task from Inbox to Tracking work by others on the Trust and Safety Product Team board.Apr 3 2025, 11:18 AM

ConsequencesExecutor already reduces many blocks into one, which is the longest. But it currently does not take the talk page access flag ('blocktalk') into account. The following is a proposed solution.

If an unblocked user triggers multiple filters, some of which block the talk page access and some do not, they should be deduplicated per 'blocktalk'. If the longest 'blocktalk' happens to be longer than the longest 'blocktalk'-less one, only the latter one may be assumed. Otherwise, two blocks will be issued.

When a blocked user edits their talk page, the same deduplication procedure will take place. If it results in a 'blocktalk'-free block, it should be deduplicated with the existing block and possibly updated (instead of inserting another one). But if the talk page access is kept, the user could exploit this to generate logspam.

Multiple identical option blocks do not appear to be reducing in to one, they are just layering on top of each other.