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Bug#511892: 'BUG: unable to handle kernel NULL pointer dereference at [...]' message when unplugging usb apc ups

tags 511892 moreinfo

On Thu, Feb 18, 2010 at 11:44:17PM +0100, Moritz Muehlenhoff wrote:
> On Thu, Jan 15, 2009 at 03:18:19PM +0200, Costin Gusa wrote:
> > Package: linux-image-2.6.26-1-amd64
> > Version: 2.6.26-12
> > Severity: normal
> > 
> > when unplugging then replugging the usb cable from the apc ups into another usb connector, the kernel outputs the message copied below.
> > I'm not sure if this persists if i turn off apcupsd or with a non-smp kernel or with a 32-bit kernel, but i'll try the first two and report back.
> There have been several changes after the 2.6.26 release to the usbhid 
> driver for fixing race conditions and to improve the error handling.
> The next release of Debian (6.0, code name Squeeze) will be based
> on 2.6.32. At this point our efforts are focused on bringing this
> version in shape. Please test the current 2.6.32 from unstable/testing
> and tell us whether the problem persists. If so, we should report it
> upstream to the kernel.org developers.
> The 2.6.32 kernel is available from packages.debian.org and can
> be installed in both Debian stable, testing and unstable
> installations.

Did you have a chance to test a more recent kernel?


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