panic on boot with today's kernel

Hi. I'm getting panic on boot with latest kernel (GENERIC)

HW is Dell OptiPlex 745 (i386)

I can get more info if needed.

panic: mutex ppc0 not owned at /usr/src/sys/dev/ppc/ppc.c:1983
cpuid = 0
KDB: enter: panic
[thread pid 0 tid 100000 ]
Stopped at      kdb_enter+0x3a: movl    $0,kdb_why
db> bt
Tracing pid 0 tid 100000 td 0xc0d3d230
kdb_enter(c0bec4be,c0bec4be,c0beacc3,c142095c,0,...) at kdb_enter+0x3a
panic(c0beacc3,c5759370,c0bd3582,7bf,c1420984,...) at panic+0x136
_mtx_assert(c5732a7c,4,c0bd3582,7bf,c56d4800,...) at _mtx_assert+0x87
ppc_write_ivar(c56d4800,c5743180,2,c06fd070,ffffffff,...) at ppc_write_ivar+0x42
ppbus_attach(c5743180,c55fd054,c0cd0dc8,c0beeeb3,80000000,...) at ppbus_attach+0x148
device_attach(c5743180,4,c0beee3c,969) at device_attach+0x36f
device_probe_and_attach(c5743180,c0bd34f5,ffffffff,0,c06ff850,...) at 
device_probe_and_attach+0x4e
ppc_attach(c56d4800,c0cd0dc8,c56d484c,c1420b84,c56ab480,...) at ppc_attach+0x143
ppc_isa_attach(c56d4800,c55fb854,c0cd0dc8,c0beeeb3,80000000,...) at 
ppc_isa_attach+0x7f
device_attach(c56d4800,4,c0beee3c,969) at device_attach+0x36f
device_probe_and_attach(c56d4800,affe,c1420c64,c04cf896,c56ab480,...) at 
device_probe_and_attach+0x4e
bus_generic_attach(c56ab480,af00,affe,c56bda68,af00,...) at bus_generic_attach+0x19
acpi_attach(c56ab480,c5643854,c0cd0dc8,c0beeeb3,80000000,...) at acpi_attach+0xba6
device_attach(c56ab480,4,c0beee3c,969) at device_attach+0x36f
device_probe_and_attach(c56ab480,c56aba00,c1420cf0,c0b16e7e,c56aba00,...) at 
device_probe_and_attach+0x4e
bus_generic_attach(c56aba00,a,c0b9fcf6,0) at bus_generic_attach+0x19
nexus_acpi_attach(c56aba00,c5674054,c0cd0dc8,c0beeeb3,80000000,...) at 
nexus_acpi_attach+0x7e
device_attach(c56aba00,4,c0beee3c,969) at device_attach+0x36f
device_probe_and_attach(c56aba00,c552627c,c1420d6c,c0b1bdfc,c0d51bd0,...) at 
device_probe_and_attach+0x4e