Panic on 11-STABLE with Xen guest

[Joe Clarke]

I believe after the commit 340016 for the dynamic IRQ layout, my Xen VM
started to panic.  I just upgraded the kernel today and saw this:

xen: unable to map IRQ#2
panic: Unable to register interrupt override
cpuid = 0
KDB: stack backtrace:
#0 0xffffffff8060a4e7 at kdb_backtrace+0x67
#1 0xffffffff805c3787 at vpanic+0x177
#2 0xffffffff805c3603 at panic+0x43
#3 0xffffffff8093a766 at madt_parse_ints+0x96
#4 0xffffffff803353f9 at acpi_walk_subtables+0x29
#5 0xffffffff8093a5e6 at xenpv_register_pirqs+0x56
#6 0xffffffff80928296 at intr_init_sources+0x116
#7 0xffffffff8055eba8 at mi_startup+0x118
#8 0xffffffff8029902c at btext+0x2c

The following kernel works:

@(#)FreeBSD 11.2-STABLE #4: Thu Nov  1 02:24:07 EDT 2018
FreeBSD 11.2-STABLE #4: Thu Nov  1 02:24:07 EDT 2018
    root at creme-brulee:/usr/obj/usr/src/sys/CREME-BRULEE

The following kernel produces the panic above immediately on boot:

@(#)FreeBSD 11.2-STABLE #5: Wed Nov 21 11:08:38 EST 2018
FreeBSD 11.2-STABLE #5: Wed Nov 21 11:08:38 EST 2018
    root at creme-brulee:/usr/obj/usr/src/sys/CREME-BRULEE

Attached is a screen grab of the console of the panic.

Joe

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