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Subject: still getting this panic on boot after update of sources.
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cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
panic: mtx_lock() of spin mutex  @ ../../../kern/kern_sx.c:172
cpuid = 0
KDB: enter: panic
[thread pid 0 tid 0 ]
Stopped at      kdb_enter+0x2b: nop
db> tr
Tracing pid 0 tid 0 td 0xc075cd08
kdb_enter(c06c95c9) at kdb_enter+0x2b
panic(c06c866c,c5f3e640,c06c9dc3,ac,0,...) at panic+0x11c
_mtx_lock_flags(c5f3e680,0,c06c9dc3,ac) at _mtx_lock_flags+0x78
_sx_xlock(c090aa40,c0904c02,dd,c0692922,ff,...) at _sx_xlock+0x34
acpi_pcib_route_interrupt(c5fb8600,c5fce300,1,c5fc5df4,c5fb8600,...) at 
acpi_pcib2
acpi_pcib_acpi_route_interrupt(c5fb8600,c5fce300,1) at 
acpi_pcib_acpi_route_intert
pci_assign_interrupt_method(c5fce880,c5fce300) at 
pci_assign_interrupt_method+0x58
pci_assign_interrupt(c5fce880,c5fce300,1) at pci_assign_interrupt+0xc0
[...]

I saw some talk of changes in pci interrupt routing etc.
this related?

(am rebuilding from scratch just to make sure)