wpasupplicant is using well defined interfaces (wext). this is rather a bug in the bcm43xx driver, so I opened a bugtask for the kernel 2.6.15 source.
Btw, did have the chance to retry with edgy (2.6.17) or feisty (2.6.20)? ** Also affects: linux-source-2.6.15 (Ubuntu) Importance: Undecided Status: Unconfirmed ** Changed in: wpasupplicant (Ubuntu) Status: Confirmed => Rejected -- Running wpa_supplicant with 2.6.15-25 / bcm34xx causes hard lockup https://launchpad.net/bugs/50432 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs