Re: automatic stacktrace on panic, was: Re: Boot fail as kvm guest

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Fri, Feb 17, 2012 at 02:21:57PM +0100, Marc Balmer wrote:
> Am 17.02.12 14:16, schrieb Hubert Feyrer:
> > On Fri, 17 Feb 2012, Marc Balmer wrote:
> >>> I think NetBSD should add a stack trace on panics automatically...
> >>
> >> Can't that be achieved using ddb.commandonenter ?
> >> Or should a ddb.stacktrace sysctl variable be introduced for this?
> > 
> > Whatever one, it should be on by default.
> > Each time we have to ask people to give us information, this is suboptimal.
> 
> So what is the best way (I am now collecting opinions)?
> 
> 1) Introduce a new sysctl ddb.stacktrace, which is on by default
> 2) Set ddb.commandonenter to 'bt' by default

While #2 is appealing, in practice I have seen it cause systems to get
stuck in a panic loop.  So, please don't do #2.

Thor