Another pmap panic

[Chavdar Ivanov <ci4ic4%gmail.com@localhost>]

Hi,

Overnight, while doing pkg_rolling-replace, my 'server' got:
...
panic: kernel diagnostic assertion "ptp->wire_count == 1" failed: file
      "/home/sysbuild/src/sys/arch/x86/x86/pmap.c", line 2232

cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x178
kern_assert() at netbsd:kern_assert+0x48
pmap_unget_ptp() at netbsd:pmap_unget_ptp+0x1f1
pmap_get_ptp() at netbsd:pmap_get_ptp+0x300
pmap_enter_ma() at netbsd:pmap_enter_ma+0x6fb
pmap_enter_default() at netbsd:pmap_enter_default+0x29
uvm_fault_internal() at netbsd:uvm_fault_internal+0xf2e
trap() at netbsd:trap+0x50a
--- trap (number 6) ---
7f7eec2007e0:
cpu0: End traceback...

dumping to dev 168,2 (offset=8, size=5225879):
...


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