[Bug] Core (and possibly periphery) appears to spawn zombie git processes if unable to reach git server

[oliverrreed]

When I brought down my reverse proxy (which proxies HTTPS for my git server) for some maintenance, I noticed that every five minutes two git processes were spawned that became zombies:

UID          PID    PPID  C STIME TTY          TIME CMD
root        1246    1187  0 Jan12 ?        00:23:30 core
root      154876    1246  0 Jan13 ?        00:00:00 [git] <defunct>
root      481342    1246  0 Jan15 ?        00:00:00 [git] <defunct>
root      481353    1246  0 Jan15 ?        00:00:00 [git] <defunct>
root     1086120    1246  0 17:01 ?        00:00:00 [git] <defunct>
root     1086131    1246  0 17:01 ?        00:00:00 [git] <defunct>
root     1086883    1246  0 17:06 ?        00:00:00 [git] <defunct>
root     1086894    1246  0 17:06 ?        00:00:00 [git] <defunct>
root     1087833    1246  0 17:11 ?        00:00:00 [git] <defunct>
root     1087844    1246  0 17:11 ?        00:00:00 [git] <defunct>

On my periphery-only servers I also noticed a zombie process from before setting up proper firewall rules to allow it access to the git server:

UID          PID    PPID  C STIME TTY          TIME CMD
root        3339    3317  0 Jan14 ?        00:18:10 periphery
root       14754    3339  0 Jan14 ?        00:00:00 [git] <defunct>