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Kernel panic with zd1211rw and today's compat-wireless

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Hello.

Today I tried to use wpa_supplicant version 0.6.8 with -Dnl80211
switch, in order to confirm that setting the country code in the
configuration file works. My zd1211rw-based card works for a short
time, and then I get a kernel panic. Sometimes the bug can be reproduced
with just a few seconds of flood ping, and sometimes the card survives
100 MB of data transfer. The problem didn't exist with the stock driver
included in linux-2.6.28.

There are several different panic messages,
the common thing is "Fatal exception in interrupt". Without uvesafb,
they also include "zd_op_tx+0x98/0x1cc [zd1211rw]" as the last line,
but with uvesafb, this sometimes changes to
"rate_control_get_rate+0xb7/0xc3 [mac80211]". Sometimes the kernel
becomes tainted with G and W flags (what do they mean?), but there were
two untainted cases.

The card is in ad-hoc mode, if that matters, and the rate control
algorithm is minstrel. WEP is used, because WPA+ad-hoc doesn't work
with this card (should it?).

Screen photos from all cases of panic are available at the following
URL:

http://picasaweb.google.com/patrakov/KernelPanic?authkey=Gv1sRgCKn5ne2jqbLYpAE&feat=directlink

-- 
Alexander E. Patrakov
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