The dmesg shows that this is -release/i386, so patch #003 from the errata might be applicable to this situation.
The dmesg also shows that the chipset is a BCM4318. There was a recent discussion about this on misc@, and while the question was not resolved, one of the respondents was able to circumvent the issue for themselves by disabling WPA on his router.
http://marc.info/?t=123505856100004&r=1&w=2