Comment 3 for bug 116951

Hi.

Same problem with my Logitech webcam.

system freeze.

Past from dmes:

[16673.237032] usb 2-2: new full speed USB device using uhci_hcd and address 5
[16673.399138] usb 2-2: configuration #1 chosen from 1 choice
[16674.527135] Linux video capture interface: v2.00
[16674.615095] quickcam: QuickCam USB camera found (driver version QuickCam USB 0.6.6 $Date: 2006/11/04 08:38:14 $)
[16674.615106] quickcam: Kernel:2.6.27-7-generic bus:2 class:FF subclass:FF vendor:046D product:0840
[16674.622277] quickcam: Sensor HDCS-1000/1100 detected
[16674.624418] quickcam: Registered device: /dev/video0
[16674.624473] usbcore: registered new interface driver quickcam
[16723.149362] BUG: unable to handle kernel NULL pointer dereference at 000001b8
[16723.149372] IP: [<f88bd122>] :usbcore:usb_hcd_unlink_urb+0x12/0x30
[16723.149401] *pde = 00000000
[16723.149416] Oops: 0000 [#1] SMP
[16723.149426] Modules linked in: quickcam videodev v4l1_compat binfmt_misc sco bridge rfcomm stp bnep l2cap bluetooth nfsd auth_rpcgss exportfs ppdev speedstep_lib cpufreq_userspace cpufreq_powersave cpufreq_stats cpufreq_conservative cpufreq_ondemand freq_table sbs sbshc pci_slot wmi video output container battery nfs lockd nfs_acl sunrpc ipv6 iptable_filter ip_tables x_tables ac sbp2 lp snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss evdev nvidia(P) snd_seq_midi parport_pc i2c_core parport snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device intel_agp snd button agpgart iTCO_wdt iTCO_vendor_support soundcore shpchp pci_hotplug snd_page_alloc ext3 jbd mbcache usbhid hid sd_mod crc_t10dif sr_mod cdrom sg ata_piix ata_generic pata_acpi libata scsi_mod dock skge ohci1394 ieee1394 ehci_hcd uhci_hcd usbcore thermal processor fan fbcon tileblit font bitblit softcursor uvesafb fuse [last unloaded: pcspkr]
[16723.149566]
[16723.149571] Pid: 8618, comm: skype Tainted: P (2.6.27-7-generic #1)
[16723.149574] EIP: 0060:[<f88bd122>] EFLAGS: 00210202 CPU: 0
[16723.149592] EIP is at usb_hcd_unlink_urb+0x12/0x30 [usbcore]
[16723.149595] EAX: 00000188 EBX: f67e7200 ECX: fffffffe EDX: f67e7200
[16723.149598] ESI: f65d7700 EDI: d04082a8 EBP: e9f6df08 ESP: e9f6df04
[16723.149601] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[16723.149605] Process skype (pid: 8618, ti=e9f6c000 task=d9f49920 task.ti=e9f6c000)
[16723.149608] Stack: f67e7200 e9f6df2c f88be216 00001388 f67e7000 d9ec42c8 d9ec42c8 e94a0000
[16723.149622] e94a0000 f65d7700 e9f6df40 f9093fa4 c014c161 e94a0000 e94a0000 e9f6df4c
[16723.149634] f9094157 00000008 e9f6df78 c01b4eb0 00000000 00000000 d04082a8 f6f98800
[16723.149646] Call Trace:
[16723.149656] [<f88be216>] ? usb_kill_urb+0x56/0xd0 [usbcore]
[16723.149677] [<f9093fa4>] ? qc_isoc_stop+0x34/0x100 [quickcam]
[16723.149687] [<c014c161>] ? down+0x31/0x50
[16723.149698] [<f9094157>] ? qc_v4l_close+0x57/0xb0 [quickcam]
[16723.149706] [<c01b4eb0>] ? __fput+0xb0/0x190
[16723.149715] [<c01b4faf>] ? fput+0x1f/0x30
[16723.149721] [<c01b18ae>] ? filp_close+0x4e/0x80
[16723.149728] [<c01b195f>] ? sys_close+0x7f/0xd0
[16723.149734] [<c0103f7b>] ? sysenter_do_call+0x12/0x2f
[16723.149744] =======================
[16723.149746] Code: c5 10 00 00 89 d8 e8 6e 14 00 00 eb b4 8d b6 00 00 00 00 8d bf 00 00 00 00 55 89 e5 53 90 8d 74 26 00 89 c3 8b 40 28 89 d1 89 da <8b> 40 30 e8 86 fe ff ff 85 c0 75 05 b8 8d ff ff ff 5b 5d c3 8d
[16723.149818] EIP: [<f88bd122>] usb_hcd_unlink_urb+0x12/0x30 [usbcore] SS:ESP 0068:e9f6df04
[16723.149891] ---[ end trace 0725d0ac606a0ae0 ]---