panic: blockable sleep lock (sleep mutex) 32 _at_ /usr/src/sys/vm/uma_core.c:1990

#0  doadump () at pcpu.h:246
#1  0xc04acb4e in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:419
#2  0xc04ace22 in panic (fmt=Variable "fmt" is not available.) at
/usr/src/sys/kern/kern_shutdown.c:575
#3  0xc04ecba0 in witness_checkorder (lock=0xc1094788, flags=9,
file=0xc06429a7 "/usr/src/sys/vm/uma_core.c", line=1990,
interlock=0x0) at /usr/src/sys/kern/subr_witness.c:1063
#4  0xc049ded4 in _mtx_lock_flags (m=0xc1094788, opts=0,
file=0xc06429a7 "/usr/src/sys/vm/uma_core.c", line=1990) at
/usr/src/sys/kern/kern_mutex.c:200
#5  0xc05b3eb3 in uma_zalloc_arg (zone=0xc108c700, udata=0x0, flags=1)
at /usr/src/sys/vm/uma_core.c:1990
#6  0xc049a564 in malloc (size=dwarf2_read_address: Corrupted DWARF
expression.) at uma.h:305
#7  0xc09cc51f in AcpiOsExecute (Type=OSL_GPE_HANDLER,
Function=0xc099c100 <AcpiEvAsynchExecuteGpeMethod>,
Context=0xc3d49618) at
/usr/src/sys/modules/acpi/acpi/../../../dev/acpica/Osd/OsdSchedule.c:103
#8  0xc099c448 in AcpiEvGpeDispatch (GpeEventInfo=0xc3d49618,
GpeNumber=2) at
/usr/src/sys/modules/acpi/acpi/../../../contrib/dev/acpica/events/evgpe.c:863
#9  0xc099c66b in AcpiEvGpeDetect (GpeXruptList=0xc3d4b400) at
/usr/src/sys/modules/acpi/acpi/../../../contrib/dev/acpica/events/evgpe.c:586
#10 0xc099e699 in AcpiEvSciXruptHandler (Context=0xc3d4b400) at
/usr/src/sys/modules/acpi/acpi/../../../contrib/dev/acpica/events/evsci.c:172
#11 0xc0487955 in intr_event_execute_handlers (p=0xc3d0aa90,
ie=0xc3d09300) at /usr/src/sys/kern/kern_intr.c:1146
#12 0xc04885bf in ithread_loop (arg=0xc3d4b3f0) at
/usr/src/sys/kern/kern_intr.c:1159
#13 0xc0485728 in fork_exit (callout=0xc0488520 <ithread_loop>,
arg=0xc3d4b3f0, frame=0xc39e7d38) at /usr/src/sys/kern/kern_fork.c:828
#14 0xc05ea6e0 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:270

Some recent change in acpi is causing this.

-- 
Paul