On 31.12.2010, Stephen Boyd wrote: 

quoted text
> [ 9085.714105] BUG: unable to handle kernel NULL pointer dereference at
> 00000000000000a4
> [ 9085.714816] IP: [<ffffffffa0025458>] rt2x00lib_txdone+0x36/0x249
> [rt2x00lib]
> [ 9085.715017] PGD 215fd067 PUD 292f4067 PMD 0
> [ 9085.715017] Oops: 0000 [#1] SMP
> [ 9085.715017] last sysfs file:
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
> [ 9085.715017] CPU 1
> [ 9085.715017] Modules linked in: usb_storage thermal snd_seq_oss
> snd_seq_midi snd_seq_dummy snd_pcm_oss snd_mixer_oss snd_hrtimer
> snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_midi_event
> snd_seq_midi_emul snd_seq scsi_wait_scan powernow_k8 mperf i2c_i801 fuse
> fan snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_pcm
> snd_seq_device snd_timer snd_page_alloc snd_util_mem rt73usb crc_itu_t
> rt2x00usb snd_hwdep snd processor r8169 via82cxxx rt2x00lib soundcore
> mii button k8temp
> [ 9085.715017]
> [ 9085.715017] Pid: 11513, comm: kworker/1:0 Not tainted 2.6.37-rc7+ #27
> MS-7094/MS-7094
[....]

I'm not quite shure on this, but it reminds me on this bug here:
https://bugzilla.kernel.org/show_bug.cgi?id=24892

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