Bug#690848: general protection fault in a ttyACM0 access

[Jonathan Nieder <jrnieder@gmail.com>]

severity 690848 important
# guessing
found 690848 linux-2.6/2.6.32-46
quit

Hi Albert,

Albert van der Horst wrote:

> A Texas Instruments Launcpad is connected as the sole
> USB device, resulting in device /dev/ttyACM0 showing up.
> No TI drivers were installed, or any specific usb-drivers.
>
> A simple program in Forth does some direct read and write on ttyACM0,
> while the device is responding. It functions properly, except for
> situation where an output stream of the device is interrupted from the
> terminal.
[...]
>  kernel:[15594.923330] general protection fault: 0000 [#1] SMP
[...]
>  kernel:[15594.923490] Code: 85 c0 75 15 65 48 8b 04 25 c8 cb 00 00 48 2d d8 1f 00 00 48
> 89 43 18 31 c0 5b c3 53 48 89 fb 48 83 ec 10 e8 31 f8 ff ff 48 89 df <f0> ff 0f 79 05 e8
> 48 ff ff ff 65 48 8b 04 25 c8 cb 00 00 48 2d

Thanks for reporting it.  Is this reproducible?  If so, please attach
full "dmesg" output from booting and reproducing the bug, since that
should give us a fuller trace.

Does a 3.2.y or newer kernel from wheezy, sid, or squeeze-backports
reproduce the same behavior?  The only packages from outside squeeze
that would be needed for this test are the kernel image itself,
linux-base, and initramfs-tools.

Sorry for the slow reply and hope that helps,
Jonathan