Java application is running with Weblogic 8.1, MQSeries and 1.4.2_10 on a Solaris system.
The application was running well prior to upgrading Weblogic from 6.1 to 8.1 and now several problems have been seen including the crash with the stack trace below:

t@58 (l@58) terminated by signal ABRT (Abort)
0xff29f2dc: __lwp_kill+0x0008:  bgeu,a   __lwp_kill+0x1c        ! 0xff29f2f0
(dbx) where
current thread: t@58
=>[1] __lwp_kill(0x0, 0x3a, 0x0, 0xff2bc008, 0xff366000, 0x0), at 0xff29f2dc 
  [2] raise(0x6, 0x0, 0x0, 0xffffffff, 0xff2c03c4, 0x0), at 0xff24bcec 
  [3] abort(0xff2bc008, 0x1, 0x1, 0xff165b81, 0x1, 0xef800000), at 0xff235984 
  [4] os::abort(0x1, 0xff165b81, 0x1, 0x7efefeff, 0x81010100, 0xff00), at 0xff0a13a4 
  [5] VMError::report_and_die(0xff17bc98, 0xff17bca7, 0xff17bcb7, 0xff171f57, 0x14f, 0xe0000000), at 0xff105d98 
  [6] report_fatal(0xff171f57, 0x14f, 0xff171fa4, 0x0, 0x0, 0x0), at 0xfef80ddc 
  [7] SharedRuntime::compute_exception_return_address(0x1, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfee98f64 
  [8] 0xefc36d20(0xefe9aac8, 0x0, 0xff1be568, 0x1, 0x0, 0x7a87eb18), at 0xefc36d20 
  [9] CompiledCodeSafepointHandler::handle_illegal_instruction_exception(0x4ea028, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfee0ab5c 
  [10] 0xefc32608(0x8fa32570, 0x8f8008b0, 0x0, 0x4, 0x20, 0xe39a5260), at 0xefc32608 
  [11] 0xefcafde0(0x20, 0x85205258, 0x85205270, 0x852052a0, 0xbc, 0xb8), at 0xefcafde0 
  [12] 0xf0036694(0x85205168, 0x852051b0, 0x85205158, 0x85205258, 0x63, 0xe58fbf28), at 0xf0036694 

From hs_err log we see:

#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
#  Internal Error (53484152454432554E54494D450E435050014F 01), pid=15856, tid=58
#
# Java VM: Java HotSpot(TM) Server VM (1.4.2_10-b03 mixed mode)

I've attached hs_err log, core file, and related libraries to this report.

The stack trace seems to be similar to one seen in a web server bug reported in CR: 4927770 which references a java bug CR: 4720694.  However the java bug should have been addressed in mantis and fixed by now.