[Bug 215344] Kernel problems

[Allan Jude]

On 2016-12-16 12:12, bugzilla-noreply at freebsd.org wrote:
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215344
> 
>             Bug ID: 215344
>            Summary: Kernel problems
>            Product: Documentation
>            Version: Latest
>           Hardware: Any
>                 OS: Any
>             Status: New
>           Severity: Affects Only Me
>           Priority: ---
>          Component: Documentation
>           Assignee: freebsd-doc at FreeBSD.org
>           Reporter: tschweikle at gmail.com
> 
> https://www.freebsd.org/doc/handbook/kernelconfig-trouble.html
> 
> Tells how to replace a kernel with an older one. But it does not describe hot
> to boot an older kernel it the newer on does not work or crashes.
> 
> It is a bad mistake to think you'll have a running system in front of you. You
> might have a crashing system in front of you and you are forced to boot an old
> kernel. It should describe how to do this.
> 
> After you managed to boot you crashing system agein, you'll be able to replace
> the new, crashing kernel with an old one.
> 

The beastie loader menu has a menu option to load kernel.old

Otherwise, drop to the loader prompt, and type:
unload
load /boot/myoldkernel/kernel
boot


-- 
Allan Jude

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