A quick search reveals that it might be from snapd (snapcraft). Every time a Qube tries to attach a file to a loop device -- perhaps to mount its filesystem -- it's still recognized as a block device (just like a USB flash drive as you mentioned) and a udev script notifies the Dom0 about the event.
If it continues to bother you, just create a '.qubes-exclude-block-devices' (without the quotes) file in the /tmp directory. It should silence all loop attaches from it, not just sanity-squashfs-290*. Should it not work, you can kill the Qubes block devices tray icon process which is afaik responsible for all the notifications iirc. -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/396d2a26-3dbc-43c1-bb32-b5f2939b199e%40googlegroups.com.
