Weblogic Server 8.1 is experiencing crashes with 1.4.1 C2 on Solaris 8.
Please find below the stack trace :

 # HotSpot Virtual Machine Error, Internal Error
 # Please report this error at
 # http://java.sun.com/cgi-bin/bugreport.cgi
 #
 # Java VM: Java HotSpot(TM) Server VM (1.4.1-b21 mixed mode)
 #
 # Error ID: 444F4D47524150480E43505000BF 01
 #
 # Problematic Thread: prio=5 tid=0xf9328 nid=0x9 runnable
 #
 Internal Error
 ShouldNotReachHere()


 detected a multithreaded program
 t@9 (l@9) terminated by signal ABRT (Abort)
 (/opt/SUNWspro/bin/../WS6/bin/sparcv9/dbx) where
 current thread: t@9
[1] _lwp_kill(0x0, 0x9, 0x0, 0xff33c000, 0xff386000, 0xff340420), at
0xff31ee6c
[2] raise(0x6, 0x0, 0x0, 0xffffffff, 0xff3403ac, 0x0), at 0xff2cb94c
[3] abort(0xff33c000, 0xf21fe6a8, 0x0, 0x4, 0x0, 0xf21fe6c9), at
0xff2b58ec
[4] os::abort(0x1, 0xb, 0xfede1d20, 0xf21febe8, 0xfeded1ec, 0x0), at
0xff0802b8
[5] JVM_handle_solaris_signal(0xfede1d20, 0xf21febe8, 0xf21fe930,
0x4000, 0x411c, 0x0), at 0xfededa64
[6] __sighndlr(0xb, 0xf21febe8, 0xf21fe930, 0xfeded170, 0x0, 0x0), at
0xff374cc8
[7] call_user_handler(0xfe7a0e00, 0x9, 0xff3878e0, 0xf21fe930,
0xf21febe8, 0xb), at 0xff36fb00
[8] sigacthandler(0xfe7a0e00, 0xf21febe8, 0xf21fe930, 0xff386000,
0xf21febe8, 0xb), at 0xff36fccc
  ---- called from signal handler with signal -25555456
(SIG-25555456) ------
[9] PhaseCFG::ScheduleLate(0xf21feff8, 0x1, 0x0, 0xbfb4d0, 0xff184000,
0x64),at 0xfede1d20
[10] PhaseCFG::GlobalCodeMotion(0xf21fedb4, 0xbfb4d0, 0x4000,
0xf21ff190, 0x41a4, 0x0), at 0xfede2cfc
[11] Compile::Code_Gen(0xf21ff540, 0xf21ff314, 0xf21ff454, 0x5c1a3c,
0xf21ff454, 0x0), at 0xfede78c4
[12] Compile::Compile(0x819c24, 0xb9aef8, 0x0, 0x736490, 0xffffffff,
0x1), at 0xfee171d4
[13] C2Compiler::compile_method(0xddbb0, 0xf21ffd38, 0x0, 0x736490,
0xffffffff, 0x0), at 0xfee13bf0
[14] CompileBroker::invoke_compiler_on_method(0x26e, 0x0, 0xffffffff,
0xf93b4, 0xff1c3024, 0xf9328), at 0xfee13430
[15] CompileBroker::compiler_thread_loop(0xf9328, 0xf9328, 0xdd748,
0xf98c8, 0x2fff88, 0xfee83f60), at 0xfeecb140
[16] JavaThread::run(0xf9328, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfee83f88
[17] _start(0xf9328, 0xfe7a0e00, 0x0, 0x0, 0x0, 0x0), at 0xfee803d4
 (/opt/SUNWspro/bin/../WS6/bin/sparcv9/dbx)

 --------
 harrier> java weblogic.version

 WebLogic Server 8.1 Mon Dec 2 23:03:08 PST 2002 225958
 WebLogic XMLX Module 8.1 Mon Dec 2 23:03:08 PST 2002 225958
 WebLogic Server 8.1 Mon Dec 2 23:03:08 PST 2002 225958


 Trying to start a 25node cluster via console and nm; clusters >
25nodecluster > start this cluster: the admin server :


 using -server