Re: crash by cdc_acm driver in kernels 4.8-rc1/5

[Oliver Neukum]

On Thu, 2016-09-08 at 14:58 +0200, Wim Osterholt wrote:
> On Thu, Sep 08, 2016 at 02:20:38PM +0200, Oliver Neukum wrote:
> > > 
> > > The oops tells things that I didn't all write down, but it says
> > > null pointer dereference at 00000246
> > 
> > That is the important part. I am sorry, but without the oops
> > nobody can help you. Please capture it
> 
> Sep  6 19:12:37 localhost kernel: usb 7-1: new full-speed USB device number 2 using uhci_hcd
> Sep  6 19:12:37 localhost kernel: usb 7-1: New USB device found, idVendor=0572, idProduct=1340
> Sep  6 19:12:37 localhost kernel: usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> Sep  6 19:12:37 localhost kernel: usb 7-1: Product: USB Modem
> Sep  6 19:12:37 localhost kernel: usb 7-1: Manufacturer: Conexant
> Sep  6 19:12:37 localhost kernel: usb 7-1: SerialNumber: 12345678
> Sep  6 19:12:38 localhost mtp-probe[13126]: checking bus 7, device 2: "/sys/devices/pci0000:00/0000:00:1d.3/usb7/7-1"
> Sep  6 19:12:38 localhost mtp-probe[13126]: bus: 7, device: 2 was not an MTP device
> Sep  6 19:12:38 localhost kernel: BUG: unable to handle kernel NULL pointer dereference at 00000246
> Sep  6 19:12:38 localhost kernel: IP: [<e0a81a35>] 0xe0a81a35
> Sep  6 19:12:38 localhost kernel: *pde = 00000000 
> Sep  6 19:12:38 localhost kernel: Oops: 0000 [#1] SMP
> Sep  6 19:12:38 localhost kernel: Modules linked in: cdc_acm(+) nouveau video drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm agpgart i2c_algo_bit lirc_serial(C) lirc_dev(O) cfg80211 rfkill binfmt_misc svgalib_helper(O) snd_pcm_oss snd_mixer_oss fbcon bitblit softcursor font tileblit sr9700 dm9601 usbnet usb_storage mii snd_hda_codec_generic tg3 snd_hda_intel snd_hda_codec ptp snd_hwdep pps_core gpio_ich snd_hda_core libphy ppdev firmware_class uhci_hcd pcspkr snd_pcm ohci_pci ohci_hcd lpc_ich ehci_pci snd_timer ehci_hcd mfd_core snd usbcore floppy soundcore wmi parport_pc usb_common parport acpi_cpufreq processor button
> Sep  6 19:12:38 localhost kernel: CPU: 0 PID: 13127 Comm: udevd Tainted: G         C O    4.8.0-rc5 #1
> Sep  6 19:12:38 localhost kernel: Hardware name: Hewlett-Packard HP xw4300 Workstation/0A00h, BIOS 786D3 v01.08 03/10/2006
> Sep  6 19:12:38 localhost kernel: task: df639c00 task.stack: df4d6000
> Sep  6 19:12:38 localhost kernel: EIP: 0060:[<e0a81a35>] EFLAGS: 00010202 CPU: 0
> Sep  6 19:12:38 localhost kernel: EAX: 00000000 EBX: def22000 ECX: 00000000 EDX: 00000124
> Sep  6 19:12:38 localhost kernel: ESI: def2227c EDI: dee04000 EBP: 00000246 ESP: df4d7ce8
> Sep  6 19:12:38 localhost kernel:  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> Sep  6 19:12:38 localhost kernel: CR0: 80050033 CR2: 00000246 CR3: 19b4d000 CR4: 00000690
> Sep  6 19:12:38 localhost kernel: Stack:
> Sep  6 19:12:38 localhost kernel:  dee8ba00 dee8ba00 dee8b400 dee04000 df4b6380 df4b63b8 00000001 dee04070
> Sep  6 19:12:38 localhost kernel:  daca2ec0 dee8ba1c 00000040 00000010 00000000 def2200c def2227c 00000000
> Sep  6 19:12:38 localhost kernel:  dee20800 00000000 df639c00 dcdc37e0 c01f4347 00000246 00000246 dcdc37e0
> Sep  6 19:12:38 localhost kernel: Call Trace:
> Sep  6 19:12:38 localhost kernel:  [<c01f4347>] ? 0xc01f4347

Hi,

your stack trace is broken. Did you fail to install the System.map file?

	Regards
		Oliver