Nethogs data is corrupt when the program is started before the connections

[unknown-spirit]

I've been using nethogs for years for my BusyTasks app. I recently discovered strange and flawed data and wondered whether it is my program or the nethogs backend. After further investigation I found that nethogs does not output correct data when it's being started before the network connections, it sometimes even crashed. Unfortunately I can't reproduce the crashes, but the data mining problem instead.

Steps for reproduction on Ubuntu 22.04 with recent nethogs version:

• Disable automatic connecting of all network connections
• Reboot OS and start "nethogs -Ca"
• Connect network manually
• Start another "nethogs -Ca" in a separate window
• Compare the results

When automatically starting BusyTasks on login, there are two options as workaround:
Either use automatic connecting mode or restart BusyTasks after activating network connections.
I cannot determine if it's a problem with connection handling in the operating system itself. The bug may not occur in older Ubuntu releases.
Thanks for your support

[raboof]

With which nethogs versions do you see this problem? 0.8.7, earlier versions as well, test master as well?

[unknown-spirit]

I first encountered it with 0.8.6 from the ubuntu repositories. This version even sometimes crashed when connecting/disconnecting, so I downloaded and compiled 0.8.7, which did not crash, but still shows questionable output.
I did not download and install the recent version from github because as far as I see there have not been any relevant commits.

[unknown-spirit]

Sorry, I misclicked on "close".