How to diagnose system freezes?

Michael Schwendt mschwendt.tmp0501.nospam at
Fri Aug 26 21:43:25 UTC 2005

On Fri, 26 Aug 2005 13:40:27 -0400, Steve Parker wrote:

> Hi,
> I'm running FC4 (with all updates) and I'm frequently experiencing total 
> system freezes (i.e. my only option is to reset).  I highly suspect this 
> has to do with a third-party kernel module (Contivity VPN client v3.3 
> from Apani) as it seems to occur only when the VPN connection is active 
> - even though the modules are always loaded.
> With no errors/messages in any of the system logs following a freeze 
> (crash, lockup, insert-your-favorite-word-here), how does one go about 
> diagnosing a problem like this?  It seems to be a common problem for 
> many people (at least on  Anyone?  Help would be 
> greatly appreciated.  Is it worth submitting a bug to bugzilla if the 
> Contivity modules are suspected?

For starters: look into enabling System Request keys, and see whether you
can get a reaction. Also keep running the machine with the screen
displaying the primary virtual console to see whether anything is logged
Michael Schwendt <mschwendt at>
Fedora Core release 4 (Stentz) - Linux 2.6.12-1.1398_FC4
loadavg: 2.41 1.57 1.38

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