uname -a: Linux shauns-box 2.6.20-16-generic #2 SMP Wed May 23 01:46:23 UTC 2007 i686 GNU/Linux
I'm using an rt61 chipset wireless card from Edimax, it wasn't working so I did an ifdown then ifup and this crashed my box (had to use SysRq-S,U,B as sudo wouldn't work to shutdown). The following was produced on screen:
Jun 8 23:13:32 localhost kernel: [ 344.584933] ------------[ cut here ]------------
Jun 8 23:13:32 localhost kernel: [ 344.584987] kernel BUG at include/linux/timer.h:82!
Jun 8 23:13:32 localhost kernel: [ 344.585028] invalid opcode: 0000 [#1]
Jun 8 23:13:32 localhost kernel: [ 344.585067] SMP
Jun 8 23:13:32 localhost kernel: [ 344.585156] Modules linked in: binfmt_misc rfcomm l2cap bluetooth nfs nfsd exportfs lockd sunrpc ipv6 ppdev radeon drm cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_ondemand freq_table cpufreq_conservative tc1100_wmi sony_acpi pcc_acpi dev_acpi video sbs i2c_ec dock container button battery asus_acpi backlight ac nls_cp437 ntfs dm_crypt fuse parport_pc lp parport snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_midi_emul snd_emu10k1 snd_ac97_codec ac97_bus snd_util_mem snd_hwdep snd_pcm_oss snd_pcm snd_page_alloc snd_mixer_oss snd_seq_dummy snd_seq_oss dvb_usb_dibusb_mb dvb_usb_dibusb_common dvb_usb dvb_core dvb_pll dib3000mc dibx000_common dib3000mb snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device psmouse pcspkr serio_raw snd sis_agp emu10k1_gp gameport rt61 agpgart soundcore shpchp pci_hotplug i2c_sis96x i2c_core af_packet evdev tsdev xfs ide_cd cdrom ide_disk pata_sis ata_generic libata scsi_mod floppy sis900 3c59x mii ehci_hcd
Jun 8 23:13:32 localhost kernel: ohci_hcd usbcore sis5513 generic raid10 raid456 xor raid1 raid0 multipath linear md_mod thermal processor fan dm_mod fbcon tileblit font bitblit softcursor vesafb capability commoncap
Jun 8 23:13:32 localhost kernel: [ 344.588704] CPU: 0
Jun 8 23:13:32 localhost kernel: [ 344.588706] EIP: 0060:[<f8ae1243>] Not tainted VLI
Jun 8 23:13:32 localhost kernel: [ 344.588707] EFLAGS: 00010286 (2.6.20-16-generic #2)
Jun 8 23:13:32 localhost kernel: [ 344.588850] EIP is at LinkDown+0x2e3/0x2f0 [rt61]
Jun 8 23:13:32 localhost kernel: [ 344.588892] eax: f5849144 ebx: f5840000 ecx: c045e49c edx: 00000068
Jun 8 23:13:32 localhost kernel: [ 344.588937] esi: f5849447 edi: f5849469 ebp: 00000000 esp: ed6cfea4
Jun 8 23:13:32 localhost kernel: [ 344.588981] ds: 007b es: 007b ss: 0068
Jun 8 23:13:32 localhost kernel: [ 344.589022] Process ifconfig (pid: 6691, ti=ed6ce000 task=e6b9fa90 task.ti=ed6ce000)
Jun 8 23:13:32 localhost kernel: [ 344.589067] Stack: f5840000 f6fd1800 00001003 00000000 f8ad7a13 f6fd1800 00001042 c0283854
Jun 8 23:13:32 localhost kernel: [ 344.589358] f6fd1800 c0282b83 dc5126e0 00000001 dc51270b ed6cff10 c02c92a1 ed6cff30
Jun 8 23:13:32 localhost kernel: [ 344.589648] c0283fbb ed6cff30 c01f20a9 ed6cff20 00000000 bf9d4df8 00008914 ed17a8c0
Jun 8 23:13:32 localhost kernel: [ 344.589937] Call Trace:
Jun 8 23:13:32 localhost kernel: [ 344.590013] [<f8ad7a13>] RT61_close+0x13/0x80 [rt61]
Jun 8 23:13:32 localhost kernel: [ 344.590092] [dev_close+84/112] dev_close+0x54/0x70
Jun 8 23:13:32 localhost kernel: [ 344.590166] [dev_change_flags+83/304] dev_change_flags+0x53/0x130
Jun 8 23:13:32 localhost kernel: [ 344.590240] [devinet_ioctl+1361/1728] devinet_ioctl+0x551/0x6c0
Jun 8 23:13:32 localhost kernel: [ 344.590317] [dev_ifsioc+235/864] dev_ifsioc+0xeb/0x360
Jun 8 23:13:32 localhost kernel: [ 344.590386] [copy_to_user+41/80] copy_to_user+0x29/0x50
Jun 8 23:13:32 localhost kernel: [ 344.590482] [sock_ioctl+191/528] sock_ioctl+0xbf/0x210
Jun 8 23:13:32 localhost kernel: [ 344.590553] [sock_ioctl+0/528] sock_ioctl+0x0/0x210
Jun 8 23:13:32 localhost kernel: [ 344.590624] [do_ioctl+43/144] do_ioctl+0x2b/0x90
Jun 8 23:13:32 localhost kernel: [ 344.590698] [vfs_ioctl+92/672] vfs_ioctl+0x5c/0x2a0
Jun 8 23:13:32 localhost kernel: [ 344.590772] [sys_ioctl+114/144] sys_ioctl+0x72/0x90
Jun 8 23:13:32 localhost kernel: [ 344.590844] [sysenter_past_esp+105/169] sysenter_past_esp+0x69/0xa9
Jun 8 23:13:32 localhost kernel: [ 344.590934] =======================
Jun 8 23:13:32 localhost kernel: [ 344.590972] Code: 39 01 00 89 fa e8 3e b2 ff ff 83 a3 2c 96 00 00 fb e9 74 fd ff ff 89 d8 e8 4b 89 01 00 e9 f3 fd ff ff c6 83 44 39 01 00 00 eb c5 <0f> 0b eb fe 89 f6 8d bc 27 00 00 00 00 83 ec 34 89 74 24 30 89
Jun 8 23:13:32 localhost kernel: [ 344.592755] EIP: [<f8ae1243>] LinkDown+0x2e3/0x2f0 [rt61] SS:ESP 0068:ed6cfea4
Jun 8 23:13:33 localhost avahi-autoipd(ra0)[6658]: Successfully claimed IP address 169.254.8.45
Jun 8 23:13:33 localhost avahi-autoipd(ra0)[6658]: fopen() failed: Permission denied
Jun 8 23:13:49 localhost kernel: [ 344.592869] <6>agpgart: Found an AGP 3.0 compliant device at 0000:00:00.0.
Jun 8 23:13:49 localhost kernel: [ 361.325490] agpgart: Putting AGP V3 device at 0000:00:00.0 into 4x mode
Jun 8 23:13:49 localhost kernel: [ 361.325497] agpgart: SiS delay workaround: giving bridge time to recover.
Jun 8 23:13:49 localhost kernel: [ 361.341323] agpgart: Putting AGP V3 device at 0000:01:00.0 into 4x mode
Jun 8 23:13:49 localhost kernel: [ 361.341339] [drm] Loading R200 Microcode
Jun 8 23:13:54 localhost kernel: [ 366.019661] 9a:95:2d:d9:33:9c:27:29:
Jun 8 23:13:54 localhost kernel: [ 366.019677] 2d:7f:cd:de:e7:5e:be:b1:
Jun 8 23:13:54 localhost kernel: [ 366.026887] 2b:37:af:5f:c7:29:42:bc:
Jun 8 23:13:54 localhost kernel: [ 366.026899] 87:08:5b:a5:83:d8:99:27:
My wlan always works for a short time after an "ifconfig ra0 up" command, but then it stoped to work, a try to restart the Interface with an Ifconfig down/up command results in an kernel bug/crash after "ifconfig ra0 down" ,so I neaded to restart the system.
As my debug code is slightly different from the code befor I include it in this message in the hope that it will help you to correct the bug