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Hi!
This should fix these issues:
The main problem was that for some reason a pointer to the curl multi handle (CURLM*) was used instead of a curlMultiObjData pointer.
The latter has the multi handle and a linked list to all the child handles as members. Trying to add an easy handle to that linked list crashed if just a simple multi handle pointer is used.
I tried to keep the fixes small so they can be reviewed easier. It's similar to parts of #19 which I discovered after fixing these bugs myself :)
It can be tested easily as things like single.tcl from tests/multi are working now. I used Ubuntu 24.04 with their default libcurl3t64-gnutls package.
Cheers,
Stephan