Any attempt to open/use a bluetooth rfcomm device locks up
scheduling completely on my machine.

Interrupts (ping, alt-sysrq) seem to be alive, but nothing else.

This was working fine in 2.6.20, broken now in 2.6.21-rc2-git*

Mar  4 09:43:52 silvy kernel: Bluetooth: L2CAP ver 2.8
Mar  4 09:43:52 silvy kernel: Bluetooth: L2CAP socket layer initialized
Mar  4 09:43:52 silvy kernel: Bluetooth: RFCOMM socket layer initialized
Mar  4 09:43:52 silvy kernel: Bluetooth: RFCOMM TTY layer initialized
Mar  4 09:43:52 silvy kernel: Bluetooth: RFCOMM ver 1.8

More info attached.

Cheers