assert in GC_locker from PSOldGen::expand with -XX:+PrintGCDetails and Verbose

# Internal Error (/java/east/u1/cphillim/hg/gc/src/share/vm/memory/gcLocker.hpp:91), pid=24505, tid=140477687342848
# assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only rea
d at safepoint
V [libjvm.so+0xc3bd40] VMError::report(outputStream*)+0x1072
V [libjvm.so+0xc3d1ac] VMError::report_and_die()+0x66a
V [libjvm.so+0x617bd5] report_vm_error(char const*, int, char const*, char con
st*)+0xa9
V [libjvm.so+0x5fbe8a] GC_locker::is_active()+0x50
V [libjvm.so+0xae414b] PSOldGen::expand(unsigned long)+0x155
V [libjvm.so+0xae3f32] PSOldGen::expand_and_allocate(unsigned long)+0x2c
V [libjvm.so+0xae3ec3] PSOldGen::allocate(unsigned long)+0x53
V [libjvm.so+0xaa0235] ParallelScavengeHeap::mem_allocate_old_gen(unsigned lon
g)+0x57
V [libjvm.so+0xa9fe02] ParallelScavengeHeap::mem_allocate(unsigned long, bool*
)+0x170
V [libjvm.so+0x3b1cd4] CollectedHeap::common_mem_allocate_noinit(unsigned long
, Thread*)+0xe6
V [libjvm.so+0x3b1e29] CollectedHeap::common_mem_allocate_init(unsigned long,

To reproduce run runThese jck tests with:

java -server -XX:+PrintGCDetails -XX:+Verbose -XX:+TraceMetadataChunkAllocation -mx1024m -classpath /java/east/u1/cphillim/runThese/classes runThese -thread 2 -repeat 1 -iter 1 -D:gc=5 -D:gc=5 -D:TESTBASE=/java/east/u1/cphillim/runThese/tests -runList rerun.dat