panic: kernel diagnostic assertion "x86_read_psl() == 0" failed

["Greg A. Woods" <woods%planix.ca@localhost>]

So this happened while running a build.sh.

The kernel is XEN3_DOM0, somewhat modified and partly updated from
many-days-gone-by-current, with last full CVS update 2021/10/29:

NetBSD xentastic 9.99.81 NetBSD 9.99.81 (XEN3_DOM0) #47: Fri Aug  9 14:04:28 PDT 2024  woods@xentastic:/build/woods/xentastic/current-amd64-amd64-obj/build/src/sys/arch/amd64/compile/XEN3_DOM0 amd64

I've never seen it before.  I've done dozens of full builds, and many
more kernel builds, and of course this is a dom0 so it provides storage
and networking for several domUs.

[ 7202.0431736] panic: kernel diagnostic assertion "x86_read_psl() == 0" failed: file "/build/src/sys/arch/x86/x86/pmap.c", line 3528
[ 7202.0431736] cpu1: Begin traceback...
[ 7202.0431736] vpanic() at netbsd:vpanic+0x14a
[ 7202.0431736] kern_assert() at netbsd:kern_assert+0x48
[ 7202.0431736] pmap_load() at netbsd:pmap_load+0x12c
[ 7202.0431736] do_pmap_load() at netbsd:do_pmap_load+0x1d
[ 7202.0431736] copyout() at netbsd:copyout+0x48
[ 7202.0431736] syscall() at netbsd:syscall+0x9c
[ 7202.0431736] --- syscall (number 449) ---
[ 7202.0431736] netbsd:syscall+0x9c:
[ 7202.0431736] cpu1: End traceback...
[ 7202.0431736] fatal breakpoint trap in supervisor mode
[ 7202.0431736] trap type 1 code 0 rip 0xffffffff8023f93d cs 0x10000e030 rflags 0x2 cr2 0x705f08992002 ilevel 0 rsp 0xffffd803173a4cc0
[ 7202.0431736] curlwp 0xffffd800437d1b00 pid 6124.6124 lowest kstack 0xffffd803173a02c0
Stopped in pid 6124.6124 (x86_64--netbsd-g) at  netbsd:breakpoint+0x5:  leave
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0x14a
kern_assert() at netbsd:kern_assert+0x48
pmap_load() at netbsd:pmap_load+0x12c
do_pmap_load() at netbsd:do_pmap_load+0x1d
copyout() at netbsd:copyout+0x48
syscall() at netbsd:syscall+0x9c
--- syscall (number 449) ---
netbsd:syscall+0x9c:
ds          4cd0
es          4c80
fs          4cc0
gs          10
rdi         0
rsi         deadbeefdeadf00d
rbp         ffffd803173a4cc0
rbx         ffffd80020d1b000
rdx         2
rcx         0
rax         0
r8          ffffd80020d1b000
r9          1
r10         0
r11         fffffffe
r12         104
r13         ffffffff80ca12a0    ostype+0x148
r14         ffffd803173a4d08
r15         4
rip         ffffffff8023f93d    breakpoint+0x5
cs          e030
rflags      2
rsp         ffffd803173a4cc0
ss          e02b
netbsd:breakpoint+0x5:  leave
db{1}> reboot 0x100

Note that it didn't dump core (can a XEN3_DOM0 dump core?)

Is it worth a PR without a core dump?

--
					Greg A. Woods <gwoods%acm.org@localhost>

Kelowna, BC     +1 250 762-7675           RoboHack <woods%robohack.ca@localhost>
Planix, Inc. <woods%planix.com@localhost>     Avoncote Farms <woods%avoncote.ca@localhost>

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