Package: xnec2c Version: 1:4.1.1-2 Tags: upstream Control: found -1 1:4.2-1 Control: forwarded -1 https://github.com/KJ7LNW/xnec2c/issues/1
xnec2c blocks the UI on sync(2) every time it closes a FILE (see https://sources.debian.org/src/xnec2c/1:4.2-1/src/utils.c/#L281). On file systems where sync is slow (e.g., ZFS), this can translate to multiple seconds of unresponsive UI at apparently random times during program execution. For the time being, I think Debian should probably just patch out the sync call. It’s not necessary for the program to function, and most people probably don’t expect their antenna simulator to be crash-safe. Until this gets resolved, running xnec2c under eatmydata seems to work fine.