Atlas stalls, and sometimes runs up to 100% CPU

[auspex]

Over 2 hours ago, atlas started the following tasks:

root       44797  0.0  0.2  47496 32416 ?        S    12:44   0:02 nmap -O -p- 192.168.2.91 -oG /config/logs/nmap_tcp_192_168_2_91.log
root       44799  0.0  0.2  47892 33760 ?        S    12:44   0:02 nmap -O -p- 192.168.2.156 -oG /config/logs/nmap_tcp_192_168_2_156.log
root       44803  0.0  0.2  47760 32864 ?        S    12:44   0:02 nmap -O -p- 192.168.2.101 -oG /config/logs/nmap_tcp_192_168_2_101.log
root       44809  0.0  0.2  48816 33984 ?        S    12:44   0:04 nmap -O -p- 192.168.2.91 -oG /config/logs/nmap_tcp_192_168_2_91.log
root       44816  0.0  0.2  46968 32864 ?        S    12:44   0:01 nmap -O -p- 192.168.2.186 -oG /config/logs/nmap_tcp_192_168_2_186.log
root       44826  0.0  0.2  48024 33760 ?        S    12:44   0:02 nmap -O -p- 192.168.2.156 -oG /config/logs/nmap_tcp_192_168_2_156.log
root       44828  0.0  0.2  46968 33088 ?        S    12:44   0:01 nmap -O -p- 192.168.2.186 -oG /config/logs/nmap_tcp_192_168_2_186.log
root       44831  0.0  0.2  47892 33760 ?        S    12:44   0:04 nmap -O -p- 192.168.2.101 -oG /config/logs/nmap_tcp_192_168_2_101.log
root       44834  0.0  0.2  47760 32640 ?        S    12:44   0:02 nmap -O -p- 192.168.2.105 -oG /config/logs/nmap_tcp_192_168_2_105.log
root       44982  0.0  0.2  48024 33312 ?        S    12:44   0:02 nmap -O -p- 192.168.2.127 -oG /config/logs/nmap_tcp_192_168_2_127.log
root       44983  0.0  0.2  47760 33088 ?        S    12:44   0:03 nmap -O -p- 192.168.2.107 -oG /config/logs/nmap_tcp_192_168_2_107.log
root       44984  0.0  0.2  49080 34680 ?        S    12:44   0:04 nmap -O -p- 192.168.2.107 -oG /config/logs/nmap_tcp_192_168_2_107.log
root       44987  0.0  0.2  48420 34208 ?        S    12:44   0:03 nmap -O -p- 192.168.2.109 -oG /config/logs/nmap_tcp_192_168_2_109.log
root       44988  0.0  0.2  48156 33536 ?        S    12:44   0:04 nmap -O -p- 192.168.2.106 -oG /config/logs/nmap_tcp_192_168_2_106.log
root       44990  0.0  0.2  47892 33204 ?        S    12:44   0:02 nmap -O -p- 192.168.2.109 -oG /config/logs/nmap_tcp_192_168_2_109.log

16 tasks, 7 of them duplicated.

The unique ones reported "Nmap done" a minute or two later, but they haven't terminated.
The duplicated ones report:

# Nmap 7.95 scan initiated Sat Nov 29 16:44:11 2025 as: nmap -O -p- -oG /config/logs/nmap_tcp_192_168_2_109.log 192.168.2.109

and nothing else.

I never get any kind of graphical display.

Surely this isn't normal?

Note, I came to this because I was investigating a network problem. That first device, .91 is a Bosch cooktop, that is dropping every third packet when I ping it. So, I know there's something wrong with my network, but it also doesn't seem right (or useful) if Atlas gets hung up when it can't nmap a device.

I started nmap -O -p- 192.168.2.91 on my desktop a few minutes ago, and it hasn't done anything yet, either.