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Special:Contributions times out when target expressed in CIDR notation
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Description

Just in case you're not already aware of this, when I went to

https://en.wikipedia.org/w/index.php?target=186.2.144.0%2F22&namespace=all&tagfilter=&start=2021-01-01&end=2021-06-15&limit=50&title=Special%3AContributions

I got:

Request from 69.115.77.204 via cp1077 cp1077, Varnish XID 593897962
Error: 503, Backend fetch failed at Tue, 15 Jun 2021 13:52:24 GMT

This looks repeatable:

Request from 69.115.77.204 via cp1077 cp1077, Varnish XID 601290340
Error: 503, Backend fetch failed at Tue, 15 Jun 2021 14:07:32 GMT

Event Timeline

ssingh triaged this task as High priority.Jun 15 2021, 2:54 PM
ssingh added a project: Traffic.
ema renamed this task from 503 errors from varnish to Special:Contributions times out when target expressed in CIDR notation.Jun 15 2021, 3:38 PM
ema edited projects, added MediaWiki-Special-pages; removed Traffic, SRE.

The problem seems to be due to the CIDR netmask used to specify the target IP. By removing %2F22 (/22) from the target parameter, the issue cannot be reproduced.