port-amd64/55083: assertion "pmap->pm_stats.resident_count == PDP_SIZE" failed

[martin%NetBSD.org@localhost]

>Number:         55083
>Category:       port-amd64
>Synopsis:       assertion "pmap->pm_stats.resident_count == PDP_SIZE" failed
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Mar 19 05:40:00 +0000 2020
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.50
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD seven-days-to-the-wolves.aprisoft.de 9.99.50 NetBSD 9.99.50 (GENERIC) #369: Wed Mar 18 21:10:34 CET 2020 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64

(current as of a few minutes before that time, but with
src/sys/arch/x86/acpi/acpi_cpu_md.c r1.81, see kern/55080.

>Description:

[ 12828.3912668] panic: kernel diagnostic assertion "pmap->pm_stats.resident_cou
nt == PDP_SIZE" failed: file "../../../../arch/x86/x86/pmap.c", line 2936 pmap 0
xffff8169c1766600 not empty
[ 12828.5913328] cpu3: Begin traceback...
[ 12828.6613673] vpanic() at netbsd:vpanic+0x146
[ 12828.7413921] kern_assert() at netbsd:kern_assert+0x48
[ 12828.8113948] pmap_remove_all() at netbsd:pmap_remove_all+0x2f0
[ 12828.8814161] uvmspace_exec() at netbsd:uvmspace_exec+0xc8
[ 12828.9514388] execve_runproc() at netbsd:execve_runproc+0x8a7
[ 12829.0214590] execve1() at netbsd:execve1+0x4e
[ 12829.0714751] sys_execve() at netbsd:sys_execve+0x2a
[ 12829.1314942] syscall() at netbsd:syscall+0x265
[ 12829.1815097] --- syscall (number 59) ---
[ 12829.2315252] 741829a42e2a:
[ 12829.2615341] cpu3: End traceback...

(internal note: seven, netbsd.3.core)

Dump and netbsd.gdb available on request.


>How-To-Repeat:

I left the machine doing a build.sh -j 12, not sure if that had completed by
the time it crashed.

>Fix:
n/a