bin/58010: crash(8) doesn't support `mach cpu N' to examine registers/stack of other CPUs

[campbell+netbsd%mumble.net@localhost]

>Number:         58010
>Category:       bin
>Synopsis:       crash(8) doesn't support `mach cpu N' to examine registers/stack of other CPUs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 08 21:45:00 +0000 2024
>Originator:     Taylor R Campbell
>Release:        current, 10, 9, 8, ...
>Organization:
The NetDDB Foundacrash
>Environment:
>Description:
The `mach cpu N' command in ddb lets you switch to another CPU's saved registers and stack, even if the CPU is running and they haven't been saved into the lwp state.  crash(8) is built without support for `mach cpu N', though.
>How-To-Repeat:
Try to examine another running CPU's registers and stack trace in a crash dump.
>Fix:
Yes, please!