buildworld panic on ia64

this is FreeBSD 8.0-current 200906 snapshot on ia64.
Updated src this morning, following the standard procedure,
on make -j6 buildworld the process stops at:

===> gnu/usr.bin/cc/cc1 (all)
cc -O2 -fno-strict-aliasing -pipe -DIN_GCC -DHAVE_CONFIG_H -DPREFIX=\"/usr/obj/u
sr/src/tmp/usr\" -I/usr/obj/usr/src/tmp/usr/src/gnu/usr.bin/cc/cc1/../cc_tools -
I/usr/src/gnu/usr.bin/cc/cc1/../cc_tools -I/usr/src/gnu/usr.bin/cc/cc1/../../../
../contrib/gcc -I/usr/src/gnu/usr.bin/cc/cc1/../../../../contrib/gcc/config -I/u
sr/src/gnu/usr.bin/cc/cc1/../../../../contrib/gcclibs/include -I/usr/src/gnu/usr
.bin/cc/cc1/../../../../contrib/gcclibs/libcpp/include -I/usr/src/gnu/usr.bin/cc
/cc1/../../../../contrib/gcclibs/libdecnumber  -I/usr/obj/usr/src/tmp/legacy/usr
/include -c /usr/src/gnu/usr.bin/cc/cc1/../../../../contrib/gcc/main.c
cc -O2 -fno-strict-aliasing -pipe -DIN_GCC -DHAVE_CONFIG_H -DPREFIX=\"/usr/obj/u
sr/src/tmp/usr\" -I/usr/obj/usr/src/tmp/usr/src/gnu/usr.bin/cc/cc1/../cc_tools -
I/usr/src/gnu/usr.bin/cc/cc1/../cc_tools -I/usr/src/gnu/usr.bin/cc/cc1/../../../
../contrib/gcc -I/usr/src/gnu/usr.bin/cc/cc1/../../../../contrib/gcc/config -I/u
sr/src/gnu/usr.bin/cc/cc1/../../../../contrib/gcclibs/include -I/usr/src/gnu/usr
.bin/cc/cc1/../../../../contrib/gcclibs/libcpp/include -I/usr/src/gnu/usr.bin/cc
/cc1/../../../../contrib/gcclibs/libdecnumber  -I/usr/obj/usr/src/tmp/legacy/usr
/include -c /usr/src/gnu/usr.bin/cc/cc1/../../../../contrib/gcc/c-parser.c
cc -O2 -fno-strict-aliasing -pipe -DIN_GCC -DHAVE_CONFIG_H -DPREFIX=\"/usr/obj/u
sr/src/tmp/usr\" -I/usr/obj/usr/src/tmp/usr/src/gnu/usr.bin/cc/cc1/../cc_tools -
I/usr/src/gnu/usr.bin/cc/cc1/../cc_tools -I/usr/src/gnu/usr.bin/cc/cc1/../../../
../contrib/gcc -I/usr/src/gnu/usr.bin/cc/cc1/../../../../contrib/gcc/config -I/u
sr/src/gnu/usr.bin/cc/cc1/../../../../contrib/gcclibs/include -I/usr/src/gnu/usr
.bin/cc/cc1/../../../../contrib/gcclibs/libcpp/include -I/usr/src/gnu/usr.bin/cc
/cc1/../../../../contrib/gcclibs/libdecnumber  -I/usr/obj/usr/src/tmp/legacy/usr
/include -c /usr/src/gnu/usr.bin/cc/cc1/../../../../contrib/gcc/c-lang.c
cc -O2 -fno-strict-aliasing -pipe -DIN_GCC -DHAVE_CONFIG_H -DPREFIX=\"/usr/obj/u
sr/src/tmp/usr\" -I/usr/obj/usr/src/tmp/usr/src/gnu/usr.bin/cc/cc1/../cc_tools -
I/usr/src/gnu/usr.bin/cc/cc1/../cc_tools -I/usr/src/gnu/usr.bin/cc/cc1/../../../
../contrib/gcc -I/usr/src/gnu/usr.bin/cc/cc1/../../../../contrib/gcc/config -I/u
sr/src/gnu/usr.bin/cc/cc1/../../../../contrib/gcclibs/include -I/usr/src/gnu/usr
.bin/cc/cc1/../../../../contrib/gcclibs/libcpp/include -I/usr/src/gnu/usr.bin/cc
/cc1/../../../../contrib/gcclibs/libdecnumber  -I/usr/obj/usr/src/tmp/legacy/usr
/include  -static -L/usr/obj/usr/src/tmp/legacy/usr/lib -o cc1-dummy main.o c-pa
rser.o c-lang.o /usr/obj/usr/src/tmp/usr/src/gnu/usr.bin/cc/cc1/../cc_int/libbac
kend.a /usr/obj/usr/src/tmp/usr/src/gnu/usr.bin/cc/cc1/../libcpp/libcpp.a /usr/o
bj/usr/src/tmp/usr/src/gnu/usr.bin/cc/cc1/../libdecnumber/libdecnumber.a /usr/ob
j/usr/src/tmp/usr/src/gnu/usr.bin/cc/cc1/../libiberty/libiberty.a -legacy
../cc_tools/genchecksum cc1-dummy > cc1-checksum.c


on the console I get:

panic: mtx_lock_spin() of destroyed mutex _at_ /usr/src/sys/ia64/ia64/trap.c:680
cpuid = 0
KDB: enter: panic
[thread pid 67078 tid 100097 ]
Stopped at      kdb_enter+0x92: [I2]    addl r14=0xffffffffffe2a8e8,gp ;;
db>


-- 
Anton Shterenlikht
Room 2.6, Queen's Building
Mech Eng Dept
Bristol University
University Walk, Bristol BS8 1TR, UK
Tel: +44 (0)117 928 8233 
Fax: +44 (0)117 929 4423