acpi panic on Dell Optiplex 760 (i82Q45 chip set)

["John D. Baker" <jdbaker%consolidated.net@localhost>]

After updating to the latest -current (9.99.76) with the recent ACPI
subsystem update, my Dell Optiplex 760 panics attaching acpi0:

[   1.0000030] acpi0 at mainbus0: Intel ACPICA 20201113
[   1.0000030] panic: kmem_free(0xffffb0ea614b6780, 32) != allocated size 0; overwrote?
[   1.0000030] cpu0: Begin traceback...
[   1.0000030] vpanic() at netbsd:vpanic+0x156
[   1.0000030] snprintf() at netbsd:snprintf
[   1.0000030] kmem_alloc() at netbsd:kmem_alloc
[   1.0000030] AcpiGetObjectInfo() at netbsd:AcpiGetObjectInfo+0x385
[   1.0000030] acpi_make_devnode() at netbsd:acpi_make_devnode+0x23
[   1.0000030] AcpiNsWalkNamespace() at netbsd:AcpiNsWalkNamespace+0xf4
[   1.0000030] AcpiWalkNamespace() at netbsd:AcpiWalkNamespace+0xc2
[   1.0000030] acpi_attach() at netbsd:acpi_attach+0x26c
[   1.0000030] config_attach_loc() at netbsd:config_attach_loc+0x17e
[   1.0000030] amd64_mainbus_attach() at netbsd:amd64_mainbus_attach+0x1b0
[   1.0000030] mainbus_attach() at netbsd:mainbus_attach+0x84
[   1.0000030] config_attach_loc() at netbsd:config_attach_loc+0x17e
[   1.0000030] cpu_configure() at netbsd:cpu_configure+0x38
[   1.0000030] main() at netbsd:main+0x32c
[   1.0000030] cpu0: End traceback...
[   1.0000030] fatal breakpoint trap in supervisor mode
[   1.0000030] trap type 1 code 0 rip 0xffffffff80221a25 cs 0x8 rflags 0x202 cr2 0 ilevel 0x8 rsp 0xffffffff81b8da80
[   1.0000030] curlwp 0xffffffff81686d80 pid 0.0 lowest kstack 0xffffffff81b882c0
Stopped in pid 0.0 (system) at  netbsd:breakpoint+0x5:  leave
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0x156
snprintf() at netbsd:snprintf
kmem_alloc() at netbsd:kmem_alloc
AcpiGetObjectInfo() at netbsd:AcpiGetObjectInfo+0x385
acpi_make_devnode() at netbsd:acpi_make_devnode+0x23
AcpiNsWalkNamespace() at netbsd:AcpiNsWalkNamespace+0xf4
AcpiWalkNamespace() at netbsd:AcpiWalkNamespace+0xc2
acpi_attach() at netbsd:acpi_attach+0x26c
config_attach_loc() at netbsd:config_attach_loc+0x17e
amd64_mainbus_attach() at netbsd:amd64_mainbus_attach+0x1b0
mainbus_attach() at netbsd:mainbus_attach+0x84
config_attach_loc() at netbsd:config_attach_loc+0x17e
cpu_configure() at netbsd:cpu_configure+0x38
main() at netbsd:main+0x32c
ds          da90
es          da40
fs          da80
gs          10
rdi         8
rsi         2f8
rbp         ffffffff81b8da80
rbx         ffffffff81b8dbc8
rdx         1
rcx         8
rax         1
r8          ffffffff81b8dbc8
r9          1e
r10         1
r11         fffffffe
r12         104
r13         ffffffff8144cb90
r14         ffffffff81b8dac8
r15         ffffb0e82c833e85
rip         ffffffff80221a25    breakpoint+0x5
cs          8
rflags      202
rsp         ffffffff81b8da80
ss          10
netbsd:breakpoint+0x5:  leave
db{0}> 


Meanwhile at least one other amd64 machine (Intel Desktop Board DG41TY,
i82G41 chip set) boots and runs just fine.  I have others, but it will
take a while to set up and test.

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