2xbtrfs external usb disks + automount in gnome == crash

[nodata]

Which component should I report this under?

I have two external usb disks formatted with btrfs. If I connect them 
both to my computer at the same time, or nearly the same time, the 
computer freezes.

Outside of Gnome I get no crash:

If I boot into runlevel 3 and power on both disks, then run a mount on 
both disks at nearly the same time, I get no freeze.

Which component should I report this under? Thanks.