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

Costin Gusa wrote:
Moritz Muehlenhoff wrote:
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

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


Moritz, apologies for late response; I am going to visit the affected machine late this week and let you know.

The behaviour seems to be gone away with the squeeze kernel. I have plugged/unplugged the usb cable several times from one connector socket to another and I only get regular kernel messages. apcupsd continues to run and detects/notifies cable plugging/unplugging

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