Re: Tracing NetBSD sun4v issues

[Palle Lyckegaard <palle%netbsd.org@localhost>]

On Fri, 16 Oct 2026, Sad Clouds wrote:

> Let's enable trap debug, see src/sys/arch/sparc64/sparc64/trap.c
>
> # sysctl -w hw.cnmagic=12345
> # 12345
> db{0}> write/l trapdebug 0x8b

I wasn't aware of cnmagic(9) - thanks for enlightening me :-)

> And it looks like the faulting virtual address could be wrong. It would
> appear the upper bits have been set to zero causing it to be
> 0xffffc011. As far as I know sparc64 stack addresses start at the upper
> end of the memory e.g. 0xffffffffffffc011.
>
> Any ideas?

Interresting - no ideas so far but will look at the code with this observation in mind.