Steps to Reproduce:
Open: the 1000px-version of https://commons.wikimedia.org/wiki/File:Dojikko2.3.svg
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Request from 22.214.171.124 via cp3038 frontend, Varnish XID 635598966
Upstream caches: cp3038 int
Error: 429, Too Many Requests at Sat, 22 Jun 2019 20:30:32 GMT
Request from 126.96.36.199 via cp1080 cp1080, Varnish XID 228725525
Error: 500, Internal Server Error at Mon, 01 Apr 2019 20:38:04 GMT
Quting Glrx from https://en.wikipedia.org/wiki/Wikipedia:SVG_help#Server_error_when_generating_SVG_thumbnail
My guess is the larger image is too complex to render in the time allotted by the server. Thus it is not a bug but a resource decision by the server managers. The image does appear to make unreasonable resource demands by filtering many small circles. Perhaps the real error is the server issued a 500 internal error rather than a 408 timeout error. Glrx (talk) 18:32, 2 April 2019 (UTC)