Are you having a particular issue or did you just notice these looking at system info?
Well, I have just noticed while looking for some info for Planetary Annihilation bug report. But Steam did crash few times on me as well.
Hello @wilx, if you're still seeing issues with an up to date system, it will require a new investigation.
In general, as long as a linux system has libcurl.so and can resolve Valve domains, then minidumps will reach the crash report system.
Nothing extracted yet.
I have just noticed that some Steam crash dumps were not uploaded. I have put them into .tar.xz and uploaded to Dropbox