I'm using libcurl in a voice server app running on Ubuntu 20.04 on an Amazon AWS EC2 instance.  When I get around 500 users on the system I start getting the error "getaddrinfo() thread failed to start" in my curl_easy_perform() calls.

Memory doesn't seem to be an issue -- I'm not going above 15% utilization.  Perhaps there's a Linux limitation (number of threads, for example) that I'm running up against but I haven't found it.

I'm building with curl 7.68.0, which as far as I can tell is the most recent version for the system I'm running on.

Any ideas?

Thanks.

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