Thanks for both being patient and then gently bumping. I actually missed your logs, so that was helpful.
You’ll note these two are close to the time frame you specify. There are times where they happen earlier in the log. I wonder if that is related to your issue.
You might want to check out this thread about Tumbler. It is interesting to note that when you had the crash, you were away from the keyboard. This suggests some sort of background process happening. Certainly, thumbnail generation is a background process, so it would make sense that this could be your culprit.
Maybe you should temporarily disable it to see if that doesn’t fix the issue. I guess if you don’t see at least the first message about Tumbler in the logs, then that should probably be your fix. As I said there, if that is the fix, then a bug report needs to be filed.