There was a SIGSEGV crash in G1 code on solaris-i586:

Stack: [0x00000000,0x00000000], sp=0xfbffe550, free space=4128761k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x43d5e2];; oopDesc*G1ParCopyHelper::copy_to_survivor_space(oopDesc*)+0x12
V [libjvm.so+0x43d0fb];; void G1ParScanThreadState::trim_queue()+0x2a3
V [libjvm.so+0x43ddef];; void G1ParEvacuateFollowersClosure::do_void()+0x23
V [libjvm.so+0x442e43];; void G1ParTask::work(int)+0x83b
V [libjvm.so+0x7b8b7e];; void GangWorker::loop()+0x96
V [libjvm.so+0x7b8aac];; void GangWorker::run()+0x24
V [libjvm.so+0x68f2a4];; java_start+0x4c8
C [libc.so.1+0xa71d0];; _thr_setup+0x4e
C [libc.so.1+0xa74c0];; _lwp_start+0x0

Please see comments for more details.