Dedicated server hangs in qcommon/common.c:Com_Milliseconds() ONLY when ran in GDB

[quakemmo]

It will display the ] prompt right after "Hunk_Clear: reset the hunk ok", and react to entering commands but pause the server initialisation (ie, the next line sohuld be "--- Common Init Complete --, but it doesn't come). Pushing just "enter" will just display another prompt. Entering any kind of command will continue the server initialisation for a bit, then hang again. In this fashion, I need to enter a few commands (any really), for the server to finish init.

Only happens when ran under GDB. I tracked the issue down to Com_Milliseconds()

Am I missing something guys? Thanks!

Running 8.2.1 on a Debian 10/64 bit, with gcc 8.3.0.

[ensiform]

Are you using code built by yourself from the latest git master? The builds available still are ancient because the test builds are offline due to security issues with the server.

[quakemmo]

Code built myself. Used to work perfectly before, not sure it does it with this particular version of GDB or maybe GCC...

[quakemmo]

The more research I've conducted, the more interesting it gets.

The problem is that when ran under GDB, STDIN_FILENO's non blocking flag gets reset by....the getpwuid() call in sys_unix.c. It does sound a little weird... I keep looking.

[quakemmo]

Here's a quick test snippet that demonstrates the behavior:
https://gist.github.com/x3c/24d9e49297751c886069214359bc19fe