arpwatch uses 100% cpu when net disconnects on laptop

Bug #357462 reported by Teunis Peters
This bug affects 9 people
Affects Status Importance Assigned to Milestone
arpwatch (Ubuntu)

Bug Description

Binary package hint: arpwatch

don't use arpwatch on a laptop. it uses 100% cpu load if the network disconnects - a frequent occurrence when travelling.

this is a severe bug causing heat shutdown of system.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
Package: arpwatch 2.1a13-2.1
 PATH=(custom, user)
SourcePackage: arpwatch
Uname: Linux 2.6.28-11-generic i686

Revision history for this message
Teunis Peters (teunis) wrote :
Revision history for this message
Francis Russell (francis-russell) wrote :

Just to note, running /etc/init.d/networking restart will have the same effect. I'm now using karmic, and due to an ordering issue between resolvconf and networking startup I find myself having to restart networking just so that machine has the correct DNS settings then killing arpwatch.

Revision history for this message (prower2000-gmail) wrote :

I can confirm that this bug exists in Karmic's version of arpwatch as well. Steps to reproduce:

1) start arpwatch running (or install it, it's started automatically if you do)
2) disable networking to your PC via the NetworkManager applet and re-enable it
3) check top, arpwatch is now using up 100% CPU in the background and continues to do so until restarted

Revision history for this message
Stefan Lasiewski (stefanlasiewski) wrote :

I've reproduced this on a desktop environment using wired Ethernet. This host does not use wireless.

Steps to reproduce:

1. Start aprwatch
2. Reboot the router, or disconnect the network cable to the router.
3. Check top, and see that arpwatch is using 100% of the CPU.

    1672 arpwatch 20 0 19536 2676 2560 R 99 0.1 797:40.63 arpwatch

Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in arpwatch (Ubuntu):
status: New → Confirmed
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