Running SPECjAppServer on SunOne AppServer 8.0 build 25 using JDK 1.4.2 build 28 about 40% of the time during the first few minutes of a run. The core file shows this stack trace:

current thread: t@17
=>[1] __sigprocmask(0x0, 0x823ff8c8, 0x0, 0x0, 0x0, 0x0), at 0xff369764
  [2] _resetsig(0xff36bf60, 0x0, 0x0, 0x82401d70, 0xff37e000, 0x0), at 0xff35e970
  [3] _sigon(0x82401d70, 0xff385930, 0x6, 0x823ff99c, 0x82401d70, 0x6), at 0xff35e110
  [4] _thrp_kill(0x0, 0x11, 0x6, 0xff37e000, 0x11, 0xff2c0440), at 0xff361150
  [5] raise(0x6, 0x0, 0x0, 0xffffffff, 0xff2c03ac, 0x4), at 0xff24b944
  [6] abort(0xff2bc000, 0x823ffaf0, 0x0, 0xfffffff8, 0x4, 0x823ffb11), at 0xff2358e4
  [7] os::abort(0x1, 0xfe54cdd3, 0x823ffb90, 0x635f, 0xfe47f120, 0xb), at 0xfe480a90
  [8] os::handle_unexpected_exception(0x4aad70, 0xb, 0xfe15c004, 0x824008c8, 0xb, 0x0), at 0xfe47f1ec
  [9] JVM_handle_solaris_signal(0xfe15c004, 0x824008c8, 0x82400610, 0x4000, 0x4164, 0x0), at 0xfe1ed234
  [10] __sighndlr(0xb, 0x824008c8, 0x82400610, 0xfe1ec948, 0x82401e14, 0x82401e04), at 0xff36b824
  [11] sigacthandler(0xb, 0x82401d70, 0x0, 0x0, 0x0, 0xff37e000), at 0xff3684d8
  ---- called from signal handler with signal 11 (SIGSEGV) ------
  [12] OopFlow::build_oop_map(0x1a, 0xf2db8c, 0x6c, 0xf0fb30, 0xd8, 0xf2db7c), at 0xfe15c004
  [13] OopFlow::compute_reach(0x24, 0xffffffff, 0x4c, 0xfffffffe, 0xf2db7c, 0xf2db7c), at 0xfe121fb8
  [14] Compile::BuildOopMaps(0x4a9608, 0xf0c3d0, 0x162, 0x2c4, 0x7ce414, 0x4a3bf8), at 0xfe1ea4f8
  [15] Compile::Output(0x824012b0, 0x0, 0xb, 0x0, 0x0, 0x0), at 0xfe1edbc4
  [16] Compile::Code_Gen(0x824012b0, 0x82401084, 0x824011c4, 0x1a7864, 0x824011c4, 0x0), at 0xfe1e71e4
  [17] Compile::Compile(0x56eb4c, 0xe5862c, 0x0, 0xe1c360, 0xffffffff, 0x1), at 0xfe216a60
  [18] C2Compiler::compile_method(0x4ab8a8, 0x82401aa8, 0x0, 0xe1c360, 0xffffffff, 0x0), at 0xfe21347c
  [19] CompileBroker::invoke_compiler_on_method(0x2f6, 0x0, 0xffffffff, 0x4aadfc, 0xfe5c907c, 0x4aad70), at 0xfe212cbc
  [20] CompileBroker::compiler_thread_loop(0x4aad70, 0x4aad70, 0x499cb8, 0x4ab310, 0x30603c, 0xfe283eac), at 0xfe2cad58
  [21] JavaThread::run(0x4aad70, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfe283ed4
  [22] _start(0x4aad70, 0xff37f688, 0x1, 0x1, 0xff37e000, 0x0), at 0xfe280320

The VM is run with these arguments:
-server -XX:+AggressiveHeap -Xms1800m -Xmx1800m -Xmn1400m -Xss128k -verbose:gc -XX:-StackTraceInThrowable -XX:+DisableExplicitGC