kern/57327: Kernel assertion failure exiting process

[mpumford%mudcovered.org.uk@localhost]

>Number:         57327
>Category:       kern
>Synopsis:       Kernel assertion failure exiting process
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Apr 07 10:45:00 +0000 2023
>Originator:     Mike Pumford
>Release:        NetBSD 10.0_BETA
>Organization:
>Environment:
System: NetBSD trigati.mudcovered.org.uk 10.0_BETA NetBSD 10.0_BETA (GENERIC_FASTHZ) #0: Mon Apr 3 23:24:33 BST 2023 builder%trigati.mudcovered.org.uk@localhost:/work/netbsd/.jenkins/workspace/NetBSD-10-amd64-build/obj.amd64/sys/arch/amd64/compile/GENERIC_FASTHZ amd64

Architecture: x86_64
Machine: amd64
>Description:
Kernel assertion triggered when doing 2 simultaneous OS builds under 
jenkins. OS builds were NetBSD-9-STABLE and NetBSD-10-BETA AMD64 both running
-j8    

Crash version 10.0_BETA, image version 10.0_BETA.
crash: _kvm_kvatop(0)
Kernel compiled without options LOCKDEBUG.
System panicked: kernel diagnostic assertion "pp->pp_pte.pte_ptp == ptp" failed: file "/work/netbsd/10-stable/src/sys/arch/x86/x86/pmap.c", line 3200
Backtrace from time of crash is available.

kern_reboot() at sys_reboot
vpanic() at vpanic+0x18d
kern_assert() at __x86_indirect_thunk_rax
pmap_remove_all() at pmap_remove_all+0x6ba
uvmspace_free() at uvmspace_free+0x41
exit1() at exit1+0x1b8
sys_exit() at sys_exit+0x39
syscall() at syscall+0x196
--- syscall (number 1) ---
syscall+0x196:

System is an 4 core 8 thread "Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz"

Similar loading on 9-STABLE never provoked any failure.

>How-To-Repeat:
Not sure how repeatable this is. Will continue to monitor.
>Fix: