The crash is pasted below. This is with 2.6.31-16.

Jan  1 18:41:58 secret-service kernel: [13294.409317] BUG: unable to handle kernel NULL pointer dereference at 00000001
Jan  1 18:41:58 secret-service kernel: [13294.409350] IP: [<c01bb811>] put_page+0x11/0x100
Jan  1 18:41:58 secret-service kernel: [13294.409385] *pde = 00000000 
Jan  1 18:41:58 secret-service kernel: [13294.409402] Oops: 0000 [#1] SMP 
Jan  1 18:41:58 secret-service kernel: [13294.409420] last sysfs file: /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:02/PNP0C0A:00/power_supply/BAT0/charge_full
Jan  1 18:41:58 secret-service kernel: [13294.409441] Modules linked in: cbc aes_i586 aes_generic binfmt_misc ppdev joydev snd_hda_codec_realtek arc4 ecb dm_crypt snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event iptable_filter snd_seq ip_tables uvcvideo snd_timer snd_seq_device x_tables ath9k mac80211 ath videodev v4l1_compat hso led_class snd psmouse serio_raw soundcore snd_page_alloc cfg80211 atl1c lp parport fbcon tileblit font bitblit softcursor i915 drm i2c_algo_bit video output intel_agp agpgart
Jan  1 18:41:58 secret-service kernel: [13294.409641] 
Jan  1 18:41:58 secret-service kernel: [13294.409651] Pid: 868, comm: phy0 Not tainted (2.6.31-16-generic #53-Ubuntu) Aspire one      
Jan  1 18:41:58 secret-service kernel: [13294.409661] EIP: 0060:[<c01bb811>] EFLAGS: 00010282 CPU: 0
Jan  1 18:41:58 secret-service kernel: [13294.409672] EIP is at put_page+0x11/0x100
Jan  1 18:41:58 secret-service kernel: [13294.409680] EAX: 00000001 EBX: 00000001 ECX: f4c33000 EDX: ed01a140
Jan  1 18:41:58 secret-service kernel: [13294.409687] ESI: f4c33000 EDI: f4c33000 EBP: f42e1d84 ESP: f42e1d70
Jan  1 18:41:58 secret-service kernel: [13294.409695]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Jan  1 18:41:58 secret-service kernel: [13294.409703] Process phy0 (pid: 868, ti=f42e0000 task=f4d0d7f0 task.ti=f42e0000)
Jan  1 18:41:58 secret-service kernel: [13294.409709] Stack:
Jan  1 18:41:58 secret-service kernel: [13294.409714]  f42e1dbc c015ff63 00000001 f4c33000 f4c33000 f42e1d94 c04938e7 f4c33000
Jan  1 18:41:58 secret-service kernel: [13294.409732] <0> 00000009 f42e1da0 c0493422 ef6341a0 f42e1da8 c04934bc f42e1de4 f887ceaf
Jan  1 18:41:58 secret-service kernel: [13294.409752] <0> e3448c00 f4c33000 c014b60f 00000000 ef635148 f8933a00 e3448c00 ed01a0b4
Jan  1 18:41:58 secret-service kernel: [13294.409773] Call Trace:
Jan  1 18:41:58 secret-service kernel: [13294.409789]  [<c015ff63>] ? hrtimer_interrupt+0x183/0x210
Jan  1 18:41:58 secret-service kernel: [13294.409803]  [<c04938e7>] ? skb_release_data+0x87/0xa0
Jan  1 18:41:58 secret-service kernel: [13294.409815]  [<c0493422>] ? __kfree_skb+0x12/0x90
Jan  1 18:41:58 secret-service kernel: [13294.409826]  [<c04934bc>] ? consume_skb+0x1c/0x40
Jan  1 18:41:58 secret-service kernel: [13294.409870]  [<f887ceaf>] ? ieee80211_tx_status+0x43f/0x470 [mac80211]
Jan  1 18:41:58 secret-service kernel: [13294.409885]  [<c014b60f>] ? irq_exit+0x2f/0x70
Jan  1 18:41:58 secret-service kernel: [13294.409921]  [<f890fb24>] ? ath_tx_complete+0x124/0x150 [ath9k]
Jan  1 18:41:58 secret-service kernel: [13294.409954]  [<f8905df7>] ? ath9k_hw_setup_calibration+0x97/0x140 [ath9k]
Jan  1 18:41:58 secret-service kernel: [13294.409989]  [<f890fbc1>] ? ath_tx_complete_buf+0x71/0xc0 [ath9k]
Jan  1 18:41:58 secret-service kernel: [13294.410003]  [<c014b405>] ? __do_softirq+0xe5/0x1a0
Jan  1 18:41:58 secret-service kernel: [13294.410036]  [<f8910f94>] ? ath_draintxq+0x134/0x280 [ath9k]
Jan  1 18:41:58 secret-service kernel: [13294.410072]  [<f89121ee>] ? ath_drain_all_txq+0xce/0x140 [ath9k]
Jan  1 18:41:58 secret-service kernel: [13294.410108]  [<f890e0e2>] ? ath_set_channel+0x82/0x200 [ath9k]
Jan  1 18:41:58 secret-service kernel: [13294.410141]  [<f890aaae>] ? ath_update_chainmask+0x7e/0x90 [ath9k]
Jan  1 18:41:58 secret-service kernel: [13294.410173]  [<f890e407>] ? ath9k_config+0x1a7/0x200 [ath9k]
Jan  1 18:41:58 secret-service kernel: [13294.410213]  [<f887c972>] ? ieee80211_hw_config+0x72/0xb0 [mac80211]
Jan  1 18:41:58 secret-service kernel: [13294.410252]  [<f8881146>] ? ieee80211_scan_work+0xb6/0x220 [mac80211]
Jan  1 18:41:58 secret-service kernel: [13294.410267]  [<c056efdc>] ? schedule+0x40c/0x730
Jan  1 18:41:58 secret-service kernel: [13294.410280]  [<c0157a7e>] ? run_workqueue+0x6e/0x140
Jan  1 18:41:58 secret-service kernel: [13294.410316]  [<f8881090>] ? ieee80211_scan_work+0x0/0x220 [mac80211]
Jan  1 18:41:58 secret-service kernel: [13294.410329]  [<c0157bd8>] ? worker_thread+0x88/0xe0
Jan  1 18:41:58 secret-service kernel: [13294.410342]  [<c015c280>] ? autoremove_wake_function+0x0/0x40
Jan  1 18:41:58 secret-service kernel: [13294.410353]  [<c0157b50>] ? worker_thread+0x0/0xe0
Jan  1 18:41:58 secret-service kernel: [13294.410364]  [<c015bf8c>] ? kthread+0x7c/0x90
Jan  1 18:41:58 secret-service kernel: [13294.410374]  [<c015bf10>] ? kthread+0x0/0x90
Jan  1 18:41:58 secret-service kernel: [13294.410386]  [<c0104007>] ? kernel_thread_helper+0x7/0x10
Jan  1 18:41:58 secret-service kernel: [13294.410393] Code: fe ff ff f0 80 23 fb eb dc 90 55 b8 e0 be 1b c0 89 e5 e8 13 d8 f9 ff 5d c3 90 55 89 e5 83 ec 14 89 5d f4 89 c3 89 75 f8 89 7d fc <66> f7 00 00 c0 0f 85 cc 00 00 00 f0 ff 48 04 0f 94 c0 84 c0 74 
Jan  1 18:41:58 secret-service kernel: [13294.410492] EIP: [<c01bb811>] put_page+0x11/0x100 SS:ESP 0068:f42e1d70
Jan  1 18:41:58 secret-service kernel: [13294.410505] CR2: 0000000000000001
Jan  1 18:41:58 secret-service kernel: [13294.410552] ---[ end trace c0571334a2c450bf ]---