TZUTC: -0800
MSGID: 53778.syncprog@1:103/705 2dabaf89
PID: Synchronet 3.21a-Linux master/48922a15c Dec 17 2025 GCC 12.2.0
TID: SBBSecho 3.33-Linux master/48922a15c Dec 17 2025 GCC 12.2.0
BBSID: VERT
CHRS: UTF-8 4
FORMAT: flowed
https://gitlab.synchro.net/main/sbbs/-/commit/114c3dfdee48db651bf568fa
Modified Files:
	src/sbbs3/answer.cpp
Log Message:
Fix potential deadlock in specific case

If the telnet client sends an IP address as a Location, and that
IP address is in a filter file, the input thread mutex would not
be unlocked.

This oddball feature was suggested on Reddit here:
https://www.reddit.com/r/synchronet/comments/khuyey/ftelnetwebsocketservicejs/

And implemented in Synchronet here:
https://gitlab.synchro.net/main/sbbs/-/commit/2bbe824c0656176d03
4f2d48558b322a69b9e32

It appears that it's been broken the whole time.

Found by some LLM (ChatGPT?) and reported by nelgin.
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