In T290146#7334733, @MarioGom wrote:

@Mess Workaround for stuck queries:

• Click Stop
• The button turns into Start query button for a fraction of second, before the alert error is shown, just click it before the error shows up.

Or more simple: just click the Stop button repeatedly, very fast.

I have the same issue also on some of my queries connected with itwiki_p: I've launched them 4 days ago, but they are still stucked on "queued" state and I can't stop them.

In T216605#5301271, @thcipriani wrote:

Applied patch and reindexed accounts 2019-07-02 17:53 UTC.

@Mess your problem should be resolved.

I've tried to log in into Gerrit (my last access was 2 years ago) with my Wikitech account (which works fine), but I'm affected by the same issue (as portraited in the image below:

I solved the "issue": there wasn't a real slowdown actually, but a simple bad implementation of queries (see latest replies on https://www.mediawiki.org/wiki/Topic:Tt2l70vyi14eafza). We can surely close this topic without regrets.

@Dvorapa It's not true: I've clicked on this query and this other one and their status is actually "queued" (and they were launched several hours ago); moreover, queries like this or this one are still running and won't stop. Meanwhile, my queries for orphaned articles in it.wiki took around 15-20 minutes until some days ago, but now they run out and are killed after 30 minutes.

In T139162#3288840, @Dvorapa wrote:

Is this still an issue? I haven't seen this issue for a while.

Have a look also on the Quarry maintanance request that was posted during the 2016 Community Wishlist Survey, where there are old reports similar to this one: https://meta.wikimedia.org/wiki/2016_Community_Wishlist_Survey/Categories/Bots_and_gadgets#Quarry_maintenance