The good news (?) is that this seems easy to reproduce; editing any file in emacs seems to do the trick:
https://pastebin.ubuntu.com/p/XydrSqfkfX/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1879196 Title: 'shifted' (shiftfs) FS mount became inconsistent with host FS; resolved by dropping caches To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1879196/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs