Kernel dump during boot

[Eugene Grosbein]

13.03.2021 23:35, Johannes Totz wrote:

> Hey everyone,
> 
> is there a way to dump the kernel from DDB?

Try this:

call doadump

> I've got a panic during boot, before init is started but after geom and friends are up. So dumpdev hasnt been set yet.
> Can I hardcode it somewhere? Setting kern.shutdown.dumpdevname in loader.conf doesn't seem to work.

It should work. It worked for me in 11.4. For example:

dumpdev="/dev/label/swap"

Later, in multiuser:

$ sysctl kern.shutdown.dumpdevname
kern.shutdown.dumpdevname: label/swap