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

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Date:   Thu, 29 Sep 2016 15:26:12 +0200
From:   Wim Osterholt <wim@....tudelft.nl>
To:     Oliver Neukum <oneukum@...e.com>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Wim Osterholt <wim@....tudelft.nl>
Subject: Re: crash by cdc_acm driver in kernels 4.8-rc1/5

On Wed, Sep 28, 2016 at 05:23:30PM +0200, Oliver Neukum wrote:
> > 
> > HP src # sync
> > HP src # [ 3744.914184] BUG: unable to handle kernel NULL pointer dereference at 00000249
> 
> The last view lines before that please with the debugging level ramped
> up to 9 please.

Recompiled again, double checked if it was really the new module.
That doesn't seem to make any difference at all.

[  549.238494] sysrq: SysRq : Changing Loglevel
[  549.265916] sysrq: Loglevel set to 9
[  549.363794] usbcore: registered new interface driver cdc_acm
[  549.429906] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[  550.941964] usb 6-1: new full-speed USB device number 2 using uhci_hcd
[  551.148944] usb 6-1: New USB device found, idVendor=0572, idProduct=1340
[  551.149975] usb 6-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  551.153974] usb 6-1: Product: USB Modem
[  551.157969] usb 6-1: Manufacturer: Conexant
[  551.161969] usb 6-1: SerialNumber: 12345678
[  551.171006] cdc_acm:acm_probe: cdc_acm 6-1:1.0: interfaces are valid
[  551.173997] BUG: unable to handle kernel NULL pointer dereference at 00000249
[  551.177957] IP: [<e0826cb6>] acm_probe+0x52d/0xced [cdc_acm]
[  551.177957] *pde = 00000000 
[  551.177957] Oops: 0000 [#1] SMP
[  551.177957] Modules linked in: cdc_acm nouveau video drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm agpgart i2c_algo_bit cfg80211 rfkill binfmt_misc svgalib_helper(O) snd_pcm_oss snd_mixer_oss fbcon bitblit softcursor font tileblit sr9700 snd_hda_codec_generic dm9601 snd_hda_intel usbnet usb_storage mii snd_hda_codec snd_hwdep tg3 snd_hda_core ptp pps_core snd_pcm gpio_ich libphy snd_timer lpc_ich ppdev firmware_class pcspkr mfd_core snd ohci_pci ohci_hcd uhci_hcd wmi floppy parport_pc soundcore ehci_pci parport acpi_cpufreq ehci_hcd button processor
[  551.177957] CPU: 0 PID: 725 Comm: kworker/0:2 Tainted: G           O    4.8.0-rc8 #1
....

Regards, Wim.