With Merlin b75, in C2 mixed mode, all bigapps (VMark, VTEST, ATG, and Tomcat)
has problem after running some period of time.
On Sparc,
(1)On jtgb4u2c1, VolanoMark hang after 0 days: 10 hours 19 minutes
Unexpected Signal: 11, PC: fe4884f8
An error has just occurred, do you want to debug the problem?
(2)On jtgb4u2c, VTest hang after 0 days: 22 hours 19 minutes
Unexpected Signal: 11, PC: fe4885a8
An error has just occurred, do you want to debug the problem?
(3)On ultraowl, atg hang after 0 days: 16 hours 6 minutes
Unexpected Signal: 11, PC: fe4884f8
An error has just occurred, do you want to debug the problem?

(/ws/on28-tools/SUNWspro/SC6.1-new/bin/../WS6U1/bin/sparcv9/dbx) where
current thread: t@10
=>[1] _libc_nanosleep(0xedf7fc30, 0xedf7fc38, 0x155f4f, 0x0, 0x0, 0xedf7fc28), at 0xff316464
  [2] __nanosleep(0x64, 0x7fffffff, 0xff38cae4, 0x64, 0x0, 0xff3395c0), at 0xff37b168
  [3] os::message_box(0xedf80948, 0xfe4d3bdc, 0xb, 0xfe4884f8, 0x0, 0x0), at 0xfe40c8a4
  [4] os::handle_unexpected_exception(0xe1a68, 0xb, 0xfe4884f8, 0xedf80ee8, 0xfe1285e0, 0x0), at 0xfe40a8b8
  [5] JVM_handle_solaris_signal(0xfe4884f8, 0xedf80ee8, 0xedf80c30, 0xfe4884fc, 0xfe4884f8, 0xedf81e28), at 0xfe128e58
  [6] __libthread_segvhdlr(0xb, 0xedf80ee8, 0xedf80c30, 0xff38cae4, 0x0, 0x0), at 0xff37940c
  [7] __sighndlr(0xb, 0xedf80ee8, 0xedf80c30, 0xff37932c, 0xedf81e48, 0xedf81e28), at 0xff37beb4
  [8] sigacthandler(0xb, 0xedf81dc0, 0xedf80c30, 0xff38cae4, 0xedf80ee8, 0xedf81dc0), at 0xff378780
  ---- called from signal handler with signal 11 (SIGSEGV) ------
  [9] SpillCopyNode::make_store(0xc1cac, 0xedf81518, 0x2f31d8, 0x54, 0x2f30d0, 0x2f3264), at 0xfe4884f8
  [10] PhaseChaitin::fixup_spills(0x2f3ba8, 0x1c, 0xfe53a000, 0x2f31d8, 0x2f3264, 0x18), at 0xfe1d6d04
  [11] PhaseChaitin::Register_Allocate(0xfe5a358c, 0xedf81284, 0x4800, 0x49ac, 0x0, 0x0), at 0xfe1d54b8
  [12] Compile::Code_Gen(0xedf81780, 0x0, 0xfa40bdc8, 0xccff8, 0xfe59b7bc, 0x38), at 0xfe1d0d7c
  [13] Compile::Compile(0xedf81780, 0xedf81b74, 0xd2e98, 0x1, 0x0, 0x445ba0), at 0xfe20b3c8
  [14] C2Compiler::compile_adapter(0x2af60, 0xedf81b74, 0xd2e98, 0x1, 0x0, 0x0), at 0xfe20b104
  [15] CompileBroker::invoke_compiler_on_adapter(0x2c87c0, 0xedf81c40, 0x0, 0xe1fa8, 0xe23a0, 0x0), at 0xfe247884
  [16] CompileBroker::compiler_thread_loop(0xe1a68, 0xe1a68, 0x76c68, 0xe1fa8, 0x2e48f0, 0xfe255d04), at 0xfe2b7d70
  [17] JavaThread::run(0xe1a68, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfe255d2c
  [18] _start(0xe1a68, 0x0, 0x1, 0xff38e138, 0x1, 0xff38cae4), at 0xfe24c72c
(/ws/on28-tools/SUNWspro/SC6.1-new/bin/../WS6U1/bin/sparcv9/dbx)

On X86,
(1) On jtgbp62c, VolanoMark hang after 0 days: 0 hours 15 minutes
Unexpected Signal: 11, PC: de9a9483
An error has just occurred, do you want to debug the problem?

current thread: t@10
  [1] __libc_nanosleep(0x64, 0xb), at 0xdfb43d0c
  [2] _ti__nanosleep(0x64), at 0xdfbc2758
  [3] os::message_box(0xceffd580, 0xdeb7f6fc), at 0xdead53d7
  [4] os::handle_unexpected_exception(0x811f5b0, 0xb, 0xde9a9483, 0xceffe11c), at 0xdead3a95
  [5] JVM_handle_solaris_signal(0xb, 0xceffe11c, 0xceffdf1c, 0x1), at 0xde8e08f0
  [6] signalHandler(), at 0xde8e03c0
  [7] __sighndlr(0xb, 0xceffe11c, 0xceffdf1c, 0xde8e03a0), at 0xdfbb332f
  [8] sigacthandler(), at 0xdfbc0441
  ---- called from signal handler with signal 11 (SIGSEGV) ------
  [9] Node::del_out(0x80fe638, 0x81b6e48), at 0xde9a9483
  [10] Node::set_req(0x81b6e48, 0x1, 0x81b6a1c), at 0xde990584
  [11] SpillCopyNode::make_load(0x81b690c, 0xceffe488, 0x81b58c8, 0x1c, 0x81b6a1c), at 0xdeb3aa04
  [12] PhaseChaitin::fixup_spills(0xceffe630), at 0xde962ae6
  [13] PhaseChaitin::Register_Allocate(0xceffe630), at 0xde95d914
  [14] Compile::Code_Gen(0xceffe840, 0x0), at 0xde96191c
  [15] Compile::Compile(0xceffe840, 0xceffec10, 0x817d540, 0x1, 0x0), at 0xde98a3ba
  [16] C2Compiler::compile_adapter(0x8069440, 0xceffec10, 0x817d540, 0x1, 0x0), at 0xde98aaff
  [17] CompileBroker::invoke_compiler_on_adapter(0x8240880), at 0xde9b74d3
  [18] CompileBroker::compiler_thread_loop(), at 0xdea00470
  [19] compiler_thread_entry(0x811f5b0, 0x811f5b0), at 0xde9ffa42
  [20] JavaThread::thread_main_inner(0x811f5b0), at 0xde9b503a
  [21] JavaThread::run(0x811f5b0), at 0xde9b4a4a
  [22] _start(0x811f5b0, 0xde9b2750), at 0xde9b276c
(2) on jtgbp62b, VolanoTest hang after 0 days: 2 hours 47 minutes
Unexpected Signal: 11, PC: deda9483
An error has just occurred, do you want to debug the problem?

3. On jtg-i111, atg hang after 0 days: 1 hours 5 minutes
Unexpected Signal: 11, PC: de9a9483
An error has just occurred, do you want to debug the problem?

Hanging processes will be kept on the machines for a few days.
I will produce a gcore file and save in bigapps archive. Please contact me
if needed.

###@###.### 2001-08-13