Created attachment 378180 [details] picture of kernel panic I guess the panic is caused by accessing /proc/brcm_monitor0 file. Patch around proc handling was changed in r1, perhaps incorrectly. Version 6.30.223.141 works fine (well, doesn't crash). Kernel version 3.14.5-gentoo.
I restored the old patch-structure in my overlay, tbc. If you want you can use that, or stick with the old ebuild, as the update in the ebuild was minimal. I will need to do a few more tests, then ask someone to commit it.
Reopening the ticket for new versions. Sympthoms are the same. Works fine until somebody reads /proc/brcm_monitor0 - then it hangs.
net-wireless/broadcom-sta-6.30.223.248-r2 sys-kernel/gentoo-sources-3.17.7 and sys-kernel/gentoo-sources-3.18.1 kernel panic can be reproduced by reading /proc/brcm_monitor0
The patch I've applied to broadcom-sta-6.30.223.248-r3 basically disables /proc/brcm_monitor0 by always returning 0. That seems unideal, but if it wasn't working before either... well at least it can't bring your system down now.