Ubuntu
bcmwl package

Reading from /proc/brcm_monitor0 causes lockup of CPU

Bug #1450825 reported by unrud
22
This bug affects 5 people
Affects Status Importance Assigned to Milestone
bcmwl (Ubuntu)
Confirmed
Undecided
Unassigned

Bug Description

Steps to reproduce:
  Install and use bcmwl-kernel-source
  $ cat /proc/brcm_monitor0
What happens:
  $ dmesg
  ...
  Watchdog detected hard LOCKUP on cpu 1
  ...

Tested on Trusty and Vivid.
The file is readable by everyone. At least change this to only root.

unrud (unrud)
summary: - Reading from /proc/brcm_monitor0 causes soft lockup of CPU
+ Reading from /proc/brcm_monitor0 causes lockup of CPU
Revision history for this message
Launchpad Janitor (janitor) wrote :

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

Changed in bcmwl (Ubuntu):
status: New → Confirmed
Revision history for this message
Matthias Homann (palto) wrote :

I faced the problem via another reported bug for Gajim which tries to read teh /proc files on startup.
https://bugs.launchpad.net/ubuntu/+source/gajim/+bug/1452006

The workaround for the Gajim issue was by restricting access to root as suggested in above bug description.

My affected system is an Acer One 722 with Ubuntu Mate 16.04.

To post a comment you must log in.
This report contains Public information  
Everyone can see this information.
Subscribing...

Other bug subscribers

Remote bug watches

Bug watches keep track of this bug in other bug trackers.