Alan Jenkins wrote:
Hi, while testing latest Git (i.e. 2.6.30-rc1 + a bit), I hit a bug
which killed my keyboard. SysRQ keys worked, but I couldn't type in X
or on the console.
This happened when ath5k was loaded dynamically, in response to my
pressing the "wireless toggle" key. (rfkill-input -> eeepc-laptop,
which does weird acpi-driven PCI hotplug).
Can anyone at least explain where this weird backtrace comes from?
Scratch that. I was able to reproduce it once and get a proper dmesg.
My logs were just dropping all the useful bits. Here it is (taint is
due to a libusual bug, note usual-tables(P) in list of modules, no
binary crap here, honest).
[ 64.995032] ath5k 0000:01:00.0: registered as 'phy0'
[ 65.062652] BUG: unable to handle kernel NULL pointer dereference at
00000004
[ 65.062665] IP: [<e0171332>] wiphy_update_regulatory+0x20f/0x295
[cfg80211]
[ 65.062705] *pdpt = 0000000008bf1001 *pde = 0000000000000000
[ 65.062717] Oops: 0000 [#1]
[ 65.062724] last sysfs file: /sys/class/backlight/eeepc/brightness
[ 65.062734] Modules linked in: ath5k(+) mac80211 led_class cfg80211
i915 drm i2c_algo_bit cfbcopyarea cfbimgblt cfbfillrect ipv6
rfkill_input joydev usual_tables(P) snd_hda_codec_realtek snd_hda_intel
snd_hda_codec snd_hwdep uhci_hcd snd_pcm_oss snd_mixer_oss i2c_i801
ehci_hcd psmouse serio_raw i2c_core pcspkr atl2 snd_pcm intel_agp
snd_timer usbcore agpgart eeepc_laptop snd_page_alloc ac video backlight
output battery rfkill button processor evdev thermal fan ata_generic
[ 65.062839]
[ 65.062849] Pid: 2909, comm: modprobe Tainted: P
(2.6.30-rc1eeepc #112) 701
[ 65.062860] EIP: 0060:[<e0171332>] EFLAGS: 00010246 CPU: 0
[ 65.062885] EIP is at wiphy_update_regulatory+0x20f/0x295 [cfg80211]
[ 65.062894] EAX: 00000000 EBX: c5da0000 ECX: 00000000 EDX: c5da0060
[ 65.062904] ESI: 0000001a EDI: c5da0060 EBP: df3bdd70 ESP: df3bdd40
[ 65.062913] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
[ 65.062923] Process modprobe (pid: 2909, ti=df3bc000 task=c5d03000
task.ti=df3bc000)
[ 65.062930] Stack:
[ 65.062935] df3bdd90 c5da0060 c04277e0 00000001 00000044 c04277e4
c5da0060 00000002
[ 65.062953] 00000002 c5da0000 0000001a c5da0060 df3bdda8 e01706a2
00000002 00000002
[ 65.062971] 00000282 000080d0 00000068 c5d53500 00000080 00000282
00000080 c5da0140
[ 65.062991] Call Trace:
[ 65.062999] [<e01706a2>] ? wiphy_register+0x122/0x1b7 [cfg80211]
[ 65.063028] [<e0328e02>] ? ieee80211_register_hw+0xd8/0x346 [mac80211]
[ 65.063069] [<e06a7c9f>] ? ath5k_hw_set_bssid_mask+0x71/0x78 [ath5k]
[ 65.063099] [<e06b0c52>] ? ath5k_pci_probe+0xa5c/0xd0a [ath5k]
[ 65.063126] [<c01a6037>] ? sysfs_find_dirent+0x16/0x27
[ 65.063146] [<c01fec95>] ? local_pci_probe+0xe/0x10
[ 65.063162] [<c01ff526>] ? pci_device_probe+0x48/0x66
[ 65.063176] [<c024c9fd>] ? driver_probe_device+0x7f/0xf2
[ 65.063193] [<c024cab3>] ? __driver_attach+0x43/0x5f
[ 65.063205] [<c024c0af>] ? bus_for_each_dev+0x39/0x5a
[ 65.063217] [<c024c8d0>] ? driver_attach+0x14/0x16
[ 65.063228] [<c024ca70>] ? __driver_attach+0x0/0x5f
[ 65.063240] [<c024c5b3>] ? bus_add_driver+0xd7/0x1e7
[ 65.063252] [<c024ccb9>] ? driver_register+0x7b/0xd7
[ 65.063272] [<c01ff827>] ? __pci_register_driver+0x32/0x85
[ 65.063286] [<e00a8018>] ? init_ath5k_pci+0x18/0x30 [ath5k]
[ 65.063309] [<c0101131>] ? _stext+0x49/0x10b
[ 65.063322] [<e00a8000>] ? init_ath5k_pci+0x0/0x30 [ath5k]
[ 65.063330] [<c012f452>] ? __blocking_notifier_call_chain+0x40/0x4c
[ 65.063330] [<c013a714>] ? sys_init_module+0x87/0x18b
[ 65.063330] [<c0102804>] ? sysenter_do_call+0x12/0x22
[ 65.063330] Code: b8 da 17 e0 83 c0 04 e8 92 f9 ff ff 84 c0 75 2a 8b
55 d4 8b 42 28 85 c0 74 0c 83 c0 04 e8 7c f9 ff ff 84 c0 75 14 a1 bc da
17 e0 <83> 78 04 03 74 66 8b 4d d4 80 79 08 00 74 5d a1 e0 d2 17 e0 48
[ 65.063330] EIP: [<e0171332>] wiphy_update_regulatory+0x20f/0x295
[cfg80211] SS:ESP 0068:df3bdd40
[ 65.063330] CR2: 0000000000000004
[ 65.063543] ---[ end trace 830f2dd2a95fd1a8 ]---
I had a look on kerneloops and found a recent bug in the same function,
I wonder if it is related (bugzilla.kernel.org/show_bug.cgi?id=12456).
It's _probably_ a regression; I've been using the wireless-toggle button
quite a bit previouslly, on 2.6.29-rc8.
Thanks in advance
Alan
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