A crash was observed on E25K Solaris 10u5 with Java 6u7-rev12 with the FVB for
6578335 plugged in:

(dbx) where
current thread: t@26
=>[1] __lwp_kill(0x0, 0x6, 0x0, 0x6, 0xfc00, 0x0), at 0xff2c596c 
  [2] raise(0x6, 0x0, 0xff2f2d78, 0xff2a8978, 0xffffffff, 0x6), at 0xff26499c 
  [3] abort(0x2cd88, 0x1, 0xfee7a978, 0xad354, 0xff2f1318, 0x0), at 0xff2410b8 
  [4] os::abort(0x1, 0xff12f574, 0x1, 0xff118000, 0x17574, 0x17400), at 0xfee712fc 
  [5] VMError::report_and_die(0xff1509c0, 0x0, 0x1, 0xff0e1d4f, 0xfef856f0, 0x17400), at 0xfef79b6c 
  [6] JVM_handle_solaris_signal(0xb, 0x5d97f550, 0x5d97f298, 0x9d800, 0x3e6400, 0xfebc28c8), at 0xfe9a52a4 
  [7] __sighndlr(0xb, 0x5d97f550, 0x5d97f298, 0xfe9a4808, 0x0, 0x1), at 0xff2c48a4 
  ---- called from signal handler with signal 11 (SIGSEGV) ------
  [8] CompactibleFreeListSpace::block_is_obj(0x15d650, 0x2701114c, 0x0, 0xa10020c0, 0x0, 0x1), at 0xfebc28c8 
  [9] CompactibleFreeListSpace::prepare_for_compaction(0x15d650, 0x5d97f6fc, 0x2701114c, 0xfebc2698, 0x79838768, 0xfebc28c8), at 0xfebc4f14 
  [10] Generation::prepare_for_compaction(0x15d538, 0x5d97f6fc, 0xfebc4d00, 0xff1418d8, 0xfebd7ae4, 0xff1422bc), at 0xfec3fe50 
  [11] GenCollectedHeap::prepare_for_compaction(0x34e50, 0xff032915, 0x0, 0x34e54, 0x4, 0x1), at 0xfec39384 
  [12] GenMarkSweep::invoke_at_safepoint(0x1ca0a0, 0xff14c800, 0xff14f000, 0x1, 0xff032800, 0x1f4e2d0), at 0xfec3a1c4 
  [13] CMSCollector::do_compaction_work(0x236470, 0x1, 0x0, 0x1, 0x2367bc, 0x3c6e88), at 0xfebd967c 
  [14] CMSCollector::acquire_control_and_collect(0x236470, 0x1, 0x0, 0xf4c00000, 0x1ca1b8, 0x1), at 0xfebd90d8 
  [15] ConcurrentMarkSweepGeneration::collect(0x236470, 0x0, 0x0, 0xc, 0x0, 0x1), at 0xfebd8d94 
  [16] GenCollectedHeap::do_collection(0x34e50, 0x3c6e88, 0x34ea0, 0xc, 0x34ea4, 0x1), at 0xfec3750c 
  [17] GenCollectorPolicy::satisfy_failed_allocation(0x34e08, 0xc, 0x34e50, 0xfe450d92, 0x0, 0xa), at 0xfebc03a8 
  [18] VM_GenCollectForAllocation::doit(0x54b0ef84, 0x34e50, 0x9, 0x8, 0x34ee8, 0x34f18), at 0xfef7a60c 
  [19] VM_Operation::evaluate(0x54b0ef84, 0x2da38, 0xff118000, 0xfe2, 0x7f172e, 0x37800), at 0xfe9c3e6c 
  [20] VMThread::evaluate_operation(0x2da38, 0x54b0ef84, 0x3e6710, 0x7f172e, 0x3e6718, 0xff118000), at 0xfef7cbac 
  [21] VMThread::loop(0x0, 0x3aac0, 0x2d160, 0x1, 0xff166708, 0x1c9cb8), at 0xfef7d144 
  [22] VMThread::run(0x3e6400, 0x36c00, 0xff14ec58, 0xff118000, 0x36c58, 0x36c00), at 0xfea474b0 
  [23] java_start(0x3e6400, 0x17, 0x3e76a0, 0x382b4, 0xff118000, 0xff078411), at 0xfee7067c 
(dbx) 


The corefile for this crash in pkgapp format can be found here:
/net/cores.germany/cores/CA_70508190