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Groups > linux.kernel > #1479156 > unrolled thread

crash by cdc_acm driver in kernels 4.8-rc1/5

Started byWim Osterholt <wim@djo.tudelft.nl>
First post2016-09-08 14:10 +0200
Last post2016-09-09 15:30 +0200
Articles 7 — 2 participants

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  crash by cdc_acm driver in kernels 4.8-rc1/5 Wim Osterholt <wim@djo.tudelft.nl> - 2016-09-08 14:10 +0200
    Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Oliver Neukum <oneukum@suse.com> - 2016-09-08 14:30 +0200
      Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Wim Osterholt <wim@djo.tudelft.nl> - 2016-09-08 15:00 +0200
        Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Oliver Neukum <oneukum@suse.com> - 2016-09-08 15:20 +0200
          Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Wim Osterholt <wim@djo.tudelft.nl> - 2016-09-08 17:10 +0200
          Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Wim Osterholt <wim@djo.tudelft.nl> - 2016-09-08 19:00 +0200
          Re: crash by cdc_acm driver in kernels 4.8-rc1/5 Wim Osterholt <wim@djo.tudelft.nl> - 2016-09-09 15:30 +0200

#1479156 — crash by cdc_acm driver in kernels 4.8-rc1/5

FromWim Osterholt <wim@djo.tudelft.nl>
Date2016-09-08 14:10 +0200
Subjectcrash by cdc_acm driver in kernels 4.8-rc1/5
Message-ID<sf6jv-5D5-27@gated-at.bofh.it>
L.S.

up to vanilla kernel 4.7.3 I've seen no problems.
On two different dekstops running vanilla kernel-4.8 I can force a crash by
inserting an USB-modem that requires module cdc_acm.ko .
(Strangely enough that doesn't happen on my laptop.)

The moment that cdc_acm loads (manually or automatically - the hardware needs
to be present) a kernel oops occurs.
The system remains responsive for a while, but a reboot is necessairy.
If you try a neat shutdown, the system will hang forever after 'remounting fs
read-only'. You'll need a power-down.

The oops tells things that I didn't all write down, but it says
null pointer dereference at 00000246
...
failed while handling devices/pci0000:00/0000:00:1d.3/usb7/7-1/7-1:1d  etc.
...
udevd .. is taking too long..

Could someone please explain and repair the magic that is happening here?

Thanks in advance, Wim Osterholt.


----- wim@djo.tudelft.nl -----

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#1479165

FromOliver Neukum <oneukum@suse.com>
Date2016-09-08 14:30 +0200
Message-ID<sf6CR-5Lv-17@gated-at.bofh.it>
In reply to#1479156
On Thu, 2016-09-08 at 13:58 +0200, Wim Osterholt wrote:
> L.S.
> 
> up to vanilla kernel 4.7.3 I've seen no problems.
> On two different dekstops running vanilla kernel-4.8 I can force a
> crash by
> inserting an USB-modem that requires module cdc_acm.ko .
> (Strangely enough that doesn't happen on my laptop.)
> 
> The moment that cdc_acm loads (manually or automatically - the
> hardware needs
> to be present) a kernel oops occurs.
> The system remains responsive for a while, but a reboot is necessairy.
> If you try a neat shutdown, the system will hang forever after
> 'remounting fs
> read-only'. You'll need a power-down.
> 
> 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

dmesg > /root/oops.txt

and report it.

	Regards
		Oliver

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#1479189

FromWim Osterholt <wim@djo.tudelft.nl>
Date2016-09-08 15:00 +0200
Message-ID<sf75T-5Vt-31@gated-at.bofh.it>
In reply to#1479165
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
Sep  6 19:12:38 localhost kernel:  [<c04357ca>] ? 0xc04357ca
Sep  6 19:12:38 localhost kernel:  [<e0ac422f>] ? 0xe0ac422f
Sep  6 19:12:38 localhost kernel:  [<c030276f>] ? 0xc030276f
Sep  6 19:12:38 localhost kernel:  [<c03028ce>] ? 0xc03028ce
Sep  6 19:12:38 localhost kernel:  [<c030140b>] ? 0xc030140b
Sep  6 19:12:38 localhost kernel:  [<c030238a>] ? 0xc030238a
Sep  6 19:12:38 localhost kernel:  [<c0302879>] ? 0xc0302879
Sep  6 19:12:38 localhost kernel:  [<c030205e>] ? 0xc030205e
Sep  6 19:12:38 localhost kernel:  [<c0302e85>] ? 0xc0302e85
Sep  6 19:12:38 localhost kernel:  [<e0ac3525>] ? 0xe0ac3525
Sep  6 19:12:38 localhost kernel:  [<e08620a9>] ? 0xe08620a9
Sep  6 19:12:38 localhost kernel:  [<e0862000>] ? 0xe0862000
Sep  6 19:12:38 localhost kernel:  [<c01003eb>] ? 0xc01003eb
Sep  6 19:12:38 localhost kernel:  [<c04357ca>] ? 0xc04357ca
Sep  6 19:12:38 localhost kernel:  [<c027c45c>] ? 0xc027c45c
Sep  6 19:12:38 localhost kernel:  [<c01ae14a>] ? 0xc01ae14a
Sep  6 19:12:38 localhost kernel:  [<c0183bf5>] ? 0xc0183bf5
Sep  6 19:12:38 localhost kernel:  [<c0183c24>] ? 0xc0183c24
Sep  6 19:12:38 localhost kernel:  [<c0174deb>] ? 0xc0174deb
Sep  6 19:12:38 localhost kernel:  [<c0175043>] ? 0xc0175043
Sep  6 19:12:38 localhost kernel:  [<c0100ed1>] ? 0xc0100ed1
Sep  6 19:12:38 localhost kernel:  [<c0436e65>] ? 0xc0436e65
Sep  6 19:12:38 localhost kernel: Code: 44 24 04 ba 20 2c a8 e0 89 58 74 83 c0 1c 89 44 24 24 e8 0f de 87 df 85 c0 0f 88 ed fe ff ff 8b 6c 24 54 85 ed 0f 84 91 00 00 00 <0f> b6 45 00 ba c0 00 40 02 83 e8 04 e8 eb c5 72 df 85 c0 89 83
Sep  6 19:12:38 localhost kernel: EIP: [<e0a81a35>]  SS:ESP 0068:df4d7ce8
Sep  6 19:12:38 localhost kernel: CR2: 0000000000000246
Sep  6 19:12:38 localhost kernel: ---[ end trace 64919c4014c0aa1d ]---
Sep  6 19:12:38 localhost kernel: udevd[919]: worker [13127] terminated by signal 9 (Killed)
Sep  6 19:12:38 localhost kernel: udevd[919]: worker [13127] failed while handling '/devices/pci0000:00/0000:00:1d.3/usb7/7-1/7-1:1.1'
Sep  6 19:12:38 localhost kernel: clocksource: timekeeping watchdog on CPU1: Marking clocksource 'tsc' as unstable because the skew is too large:
Sep  6 19:12:38 localhost kernel: clocksource:                       'refined-jiffies' wd_now: 11d65e0 wd_last: 11d6560 mask: ffffffff
Sep  6 19:12:38 localhost kernel: clocksource:                       'tsc' cs_now: dad6eef733f0 cs_last: dad67427eed0 mask: ffffffffffffffff
Sep  6 19:12:38 localhost kernel: clocksource: Switched to clocksource refined-jiffies
Sep  6 19:13:38 localhost kernel: udevd[919]: worker [13125] /devices/pci0000:00/0000:00:1d.3/usb7/7-1/7-1:1.0 is taking a long time
Sep  6 19:15:38 localhost kernel: udevd[919]: worker [13125] /devices/pci0000:00/0000:00:1d.3/usb7/7-1/7-1:1.0 timeout; kill it
Sep  6 19:15:38 localhost kernel: udevd[919]: seq 1356 '/devices/pci0000:00/0000:00:1d.3/usb7/7-1/7-1:1.0' killed
Sep  6 19:15:38 localhost kernel: udevd[919]: worker [13125] terminated by signal 9 (Killed)
Sep  6 19:15:38 localhost kernel: udevd[919]: worker [13125] failed while handling '/devices/pci0000:00/0000:00:1d.3/usb7/7-1/7-1:1.0'
Sep  6 19:15:44 localhost shutdown[13136]: shutting down for system reboot


Regards, Wim.

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#1479211

FromOliver Neukum <oneukum@suse.com>
Date2016-09-08 15:20 +0200
Message-ID<sf7pf-6h3-13@gated-at.bofh.it>
In reply to#1479189
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

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#1479309

FromWim Osterholt <wim@djo.tudelft.nl>
Date2016-09-08 17:10 +0200
Message-ID<sf97H-7om-7@gated-at.bofh.it>
In reply to#1479211
On Thu, Sep 08, 2016 at 03:05:15PM +0200, Oliver Neukum wrote:
> > 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?

Never needed that for anything the last 20 years or so.
I don't have the device at hand here, so new logs will be available
tomorrow.

Regards, Wim.

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#1479380

FromWim Osterholt <wim@djo.tudelft.nl>
Date2016-09-08 19:00 +0200
Message-ID<sfaQa-8hz-5@gated-at.bofh.it>
In reply to#1479211
On Thu, Sep 08, 2016 at 03:05:15PM +0200, Oliver Neukum wrote:
> > 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?

Source is available under /usr/src/linux --> /usr/src/linux-4.8-rc5
System.map is available there, also as System.map-4.8-rc5.
System.map and System.map-4.8-rc5 is also available in /boot.
But the call trace still shows no symbols.
From reading I understood that symbols from modules will not be available in
System.map. So what else  should I do?



[   46.133212] usb 4-1: new full-speed USB device number 2 using uhci_hcd
[   46.334136] usb 4-1: New USB device found, idVendor=0572, idProduct=1340
[   46.334140] usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   46.334142] usb 4-1: Product: USB Modem
[   46.334145] usb 4-1: Manufacturer: Conexant
[   46.334147] usb 4-1: SerialNumber: 12345678
[   46.388110] BUG: unable to handle kernel NULL pointer dereference at 00000246
[   46.391243] IP: [<e12d0a35>] 0xe12d0a35
[   46.391243] *pde = 00000000 
[   46.391243] Oops: 0000 [#1] SMP
[   46.391243] Modules linked in: cdc_acm(+) radeon drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm agpgart i2c_algo_bit fbcon bitblit softcursor font tileblit lirc_serial(C) lirc_dev(O) binfmt_misc svgalib_helper(O) snd_pcm_oss snd_mixer_oss usbhid usb_storage ipw2200 snd_intel8x0 snd_ac97_codec libipw lib80211 ac97_bus cfg80211 snd_pcm snd_timer rfkill firmware_class snd via_rhine ppdev soundcore pcspkr uhci_hcd mii ehci_pci ehci_hcd usbcore floppy parport_pc lpc_ich usb_common fan parport acpi_cpufreq thermal mfd_core processor button
[   46.391243] CPU: 1 PID: 1868 Comm: udevd Tainted: G         C O    4.8.0-rc5 #1
[   46.391243] Hardware name: MEDIONPC MS-7048/MS-7048, BIOS 6.00 PG 02/12/2004
[   46.391243] task: df6adb00 task.stack: dc740000
[   46.391243] EIP: 0060:[<e12d0a35>] EFLAGS: 00010202 CPU: 1
[   46.391243] EAX: 00000000 EBX: dec6f000 ECX: 00000000 EDX: 00000124
[   46.391243] ESI: dec6f27c EDI: dc7a5800 EBP: 00000246 ESP: dc741ce8
[   46.391243]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[   46.391243] CR0: 80050033 CR2: 00000246 CR3: 1c714000 CR4: 00000690
[   46.391243] Stack:
[   46.391243]  df788000 df788000 df788400 dc7a5800 df4b5780 df4b57b8 00000001 dc7a5870
[   46.391243]  dc4409c0 df78801c 00000040 00000010 00000000 dec6f00c dec6f27c 00000000
[   46.391243]  dc79e800 00000000 df6adb00 da4a5f30 c01f5243 00000246 00000246 da4a5f30
[   46.391243] Call Trace:
[   46.391243]  [<c01f5243>] ? 0xc01f5243
[   46.391243]  [<c043c68a>] ? 0xc043c68a
[   46.391243]  [<e09fc22f>] ? 0xe09fc22f
[   46.391243]  [<c03087a8>] ? 0xc03087a8
[   46.391243]  [<c0308907>] ? 0xc0308907
[   46.391243]  [<c0307444>] ? 0xc0307444
[   46.391243]  [<c03083c3>] ? 0xc03083c3
[   46.391243]  [<c03088b2>] ? 0xc03088b2
[   46.391243]  [<c0308097>] ? 0xc0308097
[   46.391243]  [<c0308ebe>] ? 0xc0308ebe
[   46.391243]  [<e09fb525>] ? 0xe09fb525
[   46.391243]  [<e12d30a9>] ? 0xe12d30a9
[   46.391243]  [<e12d3000>] ? 0xe12d3000
[   46.391243]  [<c01003eb>] ? 0xc01003eb
[   46.391243]  [<c043c68a>] ? 0xc043c68a
[   46.391243]  [<c027d355>] ? 0xc027d355
[   46.391243]  [<c01af013>] ? 0xc01af013
[   46.391243]  [<c0184275>] ? 0xc0184275
[   46.391243]  [<c01842a4>] ? 0xc01842a4
[   46.391243]  [<c017546b>] ? 0xc017546b
[   46.391243]  [<c01756c3>] ? 0xc01756c3
[   46.391243]  [<c0100ed1>] ? 0xc0100ed1
[   46.391243]  [<c043dd25>] ? 0xc043dd25
[   46.391243] Code: 44 24 04 ba 20 1c 2d e1 89 58 74 83 c0 1c 89 44 24 24 e8 35 4e 03 df 85 c0 0f 88 ed fe ff ff 8b 6c 24 54 85 ed 0f 84 91 00 00 00 <0f> b6 45 00 ba c0 00 40 02 83 e8 04 e8 b4 e4 ed de 85 c0 89 83
[   46.391243] EIP: [<e12d0a35>]  SS:ESP 0068:dc741ce8
[   46.391243] CR2: 0000000000000246
[   46.802809] ---[ end trace 3cd7f784cc67fa66 ]---
[   46.811156] udevd[884]: worker [1868] terminated by signal 9 (Killed)
[   46.811164] udevd[884]: worker [1868] failed while handling '/devices/pci0000:00/0000:00:1d.2/usb4/4-1/4-1:1.1'


Regards, Wim.
y

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#1479991

FromWim Osterholt <wim@djo.tudelft.nl>
Date2016-09-09 15:30 +0200
Message-ID<sfu2u-3kj-11@gated-at.bofh.it>
In reply to#1479211
> your stack trace is broken. Did you fail to install the System.map file?
> 
> 	Regards
> 		Oliver

>Finally found something.
>CONFIG_DEBUG_INFO was not set.

Doesn't make any difference either.
Compiled cdc_acm in the kernel, not as a module. Doesn't make any
difference, except for that it says 'a reboot is necessairy' en then it
freezes. Still no symbols.

Google didn't tell me anything useful, nor did you.
This took me days already.
I told you all you need: plug in a modem that needs cdc_acm.


Wim.


----- wim@djo.tudelft.nl -----

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