kern/59793: ld_virtio assertion failure after forced kernel core dump during reboot

[thorpej%me.com@localhost]

>Number:         59793
>Category:       kern
>Synopsis:       ld_virtio assertion failure after forced kernel core dump during reboot
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Nov 26 15:30:00 +0000 2025
>Originator:     Jason Thorpe
>Release:        NetBSD 11.99.4
>Organization:
Knights of the CISCadel
>Environment:
NetBSD 11.99.4 on virt68k
>Description:
While gathering a kernel crash dump in order to do some libkvm development, ld_virtio had an assertion failure while rebooting:

[ 129.5899928] dumping to dev 2,1 offset 1048526
[ 129.5899928] dump 512 511 510 509 508 507 506 505 504 503 502 501 500 499 498 
.
.
.
 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 succeeded


[ 129.5899928] Skipping crash dump on recursive panic
[ 129.5899928] panic: kernel diagnostic assertion "vr->vr_bp == NULL" failed: file "../../../../dev/pci/ld_virtio.c", line 923 
[ 129.5899928] cpu0: Begin traceback...
[ 129.5899928] ?(?)
[ 129.5899928] db_panic(1,1288080,27448a,274d81,bbd4db8) at 0
[ 129.5899928] vpanic(?)
[ 129.5899928] kern_assert(274d81,274d75,2aaf9c,2aaf7c,39b) + 184
[ 129.5899928] ld_virtio_ioctl(1288080,80046476,0,0,1) + 11c
[ 129.5899928] ld_flush() + 30
[ 129.5899928] cpu0: End traceback...
[ 129.5899928] rebooting...

>How-To-Repeat:
I triggered the issue by doing: "halt -d", but I don't know if it's reproducible (yet).
>Fix:
N/A