I synced a (quite large, approx 140 GB) tree and later discovered that
I (again) forgot to use the option "times = true". To avoid manually selection
the direction I called the profile with "-force I<local-copy>" after
insterting "times = true" in the profile.

Unsion-gtk detects (all? - at least a lot) files to update the meta
data and after starting the synchronisation works for some time, cause
some load on the local machine. Instead of finishing as usual I get
the crash (screenshot attached) and no change is done on the remote
replica (as far as I can see).

For a smaller tree (1,3 GB) this procedure worked (same local and remote
machine).