Seems to have happened quite fast:
elapsed time: 0 seconds (0d 0h 0m 0s)

There are only records of three GCs in the log.

Possibly the same issue as in JI-9014461

# SIGSEGV (0xb) at pc=0x00007f2c66104e70, pid=2233, tid=139828641265408
#
# JRE version: Java(TM) SE Runtime Environment (9.0) (build 1.9.0-internal-fastdebug-20150330201834.jesper.main2gc-b00)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (1.9.0-internal-fastdebug-20150330201834.jesper.main2gc-b00 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# V [libjvm.so+0x59ee70] ObjectStartArray::object_start(HeapWord*) const+0x270


Stack: [0x00007f2c646df000,0x00007f2c647e0000], sp=0x00007f2c647de8e0, free space=1022k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x59ee70] ObjectStartArray::object_start(HeapWord*) const+0x270;; ObjectStartArray::object_start(HeapWord*) const+0x270
V [libjvm.so+0x59b9a2] CardTableExtension::scavenge_contents_parallel(ObjectStartArray*, MutableSpace*, HeapWord*, PSPromotionManager*, unsigned int, unsigned int)+0x5d2;; CardTableExtension::scavenge_contents_parallel(ObjectStartArray*, MutableSpace*, HeapWord*, PSPromotionManager*, unsigned int, unsigned int)+0x5d2
V [libjvm.so+0xea4e3d] OldToYoungRootsTask::do_it(GCTaskManager*, unsigned int)+0x11d;; OldToYoungRootsTask::do_it(GCTaskManager*, unsigned int)+0x11d
V [libjvm.so+0x88af73] GCTaskThread::run()+0x203;; GCTaskThread::run()+0x203
V [libjvm.so+0xdde012] java_start(Thread*)+0xf2;; java_start(Thread*)+0xf2