bin/59794: savecore(8) should not require an accessible kernel binary for basic "save the crash dump" functionality

[thorpej%me.com@localhost]

>Number:         59794
>Category:       bin
>Synopsis:       savecore(8) should not require an accessible kernel binary for basic "save the crash dump" functionality
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Nov 26 15:40:00 +0000 2025
>Originator:     Jason Thorpe
>Release:        NetBSD 11.99.4
>Organization:
Knights of the CISCadel
>Environment:
NetBSD virt68k 11.99.4 NetBSD 11.99.4 (GENERIC) #162: Mon Nov 24 08:28:07 PST 2025  thorpej@dhcp-171.ktnet:/Users/thorpej/NetBSD/current/m68k/src/sys/arch/virt68k/compile/GENERIC virt68k

>Description:
savecore(8) requires a kernel image in order to access various things that, while seemingly nice to have, do not seem to be critical for the basic task of "extract crash dump from dump device and write it out to /var/crash".  This is particularly annoying on systems where the kernel is loaded not out of the root file system, but via some other mechanism (e.g. on the command line of an emulator, as with virt68k).
>How-To-Repeat:
Try to use savecore(8) on virt68k.
>Fix:
Yes, please!