vm crashed while running volano with the folowin flags:
-server -XX:CompileThreshold=100 -XX:+ZombieALot -XX:+SafepointALot -XX:+DeoptimizeALot

Java Version:
Java VM: Java HotSpot(TM) Server VM (20030210111048.azeem.merge0210-fastdebug-debug mixed mode)
Runnign 1.4.2 b16

How to reproduce:
1. cd /net/sqesvr.eng/export/vsn/GammaBase/Bugs/{BugID}
2. I am going to create the reproduciable case and place the core file

Note : there are two asserts happend one after another:
      1. assert(nm != __null && (nm2 == __null || nm == nm2), "nmethods must match")#
      2. core dump with message "pure virtual method called" ?

Above crash "nmethods must match" also detected in solx86 .

---Crashlog--------------

logName is /net/malloc.sfbay/export/BIGAPPS/volano/RESULTS/VOLANO-linux-i586-13-Feb-02-03-23-56-55/2.4.18-14.bumpercar.SFBay.Sun.COM.0Cpus.25.-server-XX:CompileThreshold=100-XX:+ZombieALot-XX:+SafepointALot-XX:+DeoptimizeALot
VM option 'CompileThreshold=100'
VM option '+ZombieALot'
VM option '+SafepointALot'
VM option '+DeoptimizeALot'
VM option 'CompileThreshold=100'
VM option '+ZombieALot'
VM option '+SafepointALot'
VM option '+DeoptimizeALot'
VolanoChat(TM) Server Version 2.1.2
Copyright (C) 1996-1999 Volano LLC. All rights reserved.
Loading server properties from /.automount/malloc.sfbay/root/export/BIGAPPS/volano/RESULTS/VOLANO-linux-i586-13-Feb-02-03-23-56-55/properties.txt.
/net/malloc.sfbay/export/BIGAPPS/volano/sleepy: /net/malloc.sfbay/export/BIGAPPS/volano/sleepy: cannot execute binary file
/net/malloc.sfbay/export/BIGAPPS/volano/RunVolano.ksh[104]: /usr/ucb/ps: not found
/net/malloc.sfbay/export/BIGAPPS/volano/RunVolano.ksh[104]: /usr/ucb/ps: not found
localhost (127.0.0.1) VolanoChatPro - unlimited connections.

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/interpreterRuntime.cpp:596
#
# HotSpot Virtual Machine Error, assertion failure
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/interpreterRuntime.cpp:596
[error occured during error reporting]
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/interpreterRuntime.cpp:596
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/interpreterRuntime.cpp:596
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/interpreterRuntime.cpp:596
# Java VM: Java HotSpot(TM) Server VM (20030210111048.azeem.merge0210-fastdebug-debug mixed mode)
#
# assert(nm != __null && (nm2 == __null || nm == nm2), "nmethods must match")# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/interpreterRuntime.cpp:596

#
# Error ID: /export/imgr/20030210111048.azeem.merge0210/ws/src/share/vm/interpreter/interpreterRuntime.cpp, 596
#
# Problematic Thread: prio=1 tid=0x08716e20
nid=0x2c98 runnable An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : 11 occurred at PC=0x4202B168
Function=exit+0x78
Library=/net/vmsqe/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2//linux-i586/bin/java

Current Java thread:


****************
Another exception has been detected while we were handling last error.
Dumping information about last error:
ERROR REPORT FILE = (N/A)
PC = 0x4202b168
SIGNAL = 11
FUNCTION NAME = exit
OFFSET = 0x78
LIBRARY NAME = /net/vmsqe/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2//linux-i586/bin/java
Please check ERROR REPORT FILE for further information, if there is any.
Good bye.
        at COM.volano.mbn.ê(Unknown Source)
        at COM.volano.mbn.í(Unknown Source)
        at COM.volano.mbn.update(Unknown Source)
        at java.util.Observable.notifyObservers(Observable.java:142)
        at COM.volano.mby.Ç(Unknown Source)
        at COM.volano.mby.run(Unknown Source)
        at java.lang.Thread.run(Thread.java:534)

Dynamic libraries:
08048000-0804e000 r-xp 00000000 00:16 43499855 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/bin/java
0804e000-0804f000 rw-p 00005000 00:16 43499855 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/bin/java
40000000-40012000 r-xp 00000000 03:02 1077125 /lib/ld-2.2.93.so
40012000-40013000 rw-p 00012000 03:02 1077125 /lib/ld-2.2.93.so
40014000-4001c000 r-xp 00000000 00:16 43745630 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/i386/native_threads/libhpi.so
4001c000-4001d000 rw-p 00007000 00:16 43745630 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/i386/native_threads/libhpi.so
4001d000-40026000 r-xp 00000000 03:02 1077158 /lib/libnss_files-2.2.93.so
40026000-40027000 rw-p 00008000 03:02 1077158 /lib/libnss_files-2.2.93.so
40027000-4002b000 rw-s 00000000 03:02 850096 /tmp/hsperfdata_madhava/9332
4002b000-4002e000 r--s 00000000 00:16 57180508 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/ext/dnsns.jar
40030000-4003d000 r-xp 00000000 03:02 212170 /lib/i686/libpthread-0.10.so
4003d000-40040000 rw-p 0000d000 03:02 212170 /lib/i686/libpthread-0.10.so
40060000-40062000 r-xp 00000000 03:02 1077138 /lib/libdl-2.2.93.so
40062000-40063000 rw-p 00001000 03:02 1077138 /lib/libdl-2.2.93.so
40063000-413ff000 r-xp 00000000 00:16 44544397 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/i386/server/libjvm.so
413ff000-41464000 rw-p 0139b000 00:16 44544397 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/i386/server/libjvm.so
414bf000-414d1000 r-xp 00000000 03:02 1077142 /lib/libnsl-2.2.93.so
414d1000-414d2000 rw-p 00012000 03:02 1077142 /lib/libnsl-2.2.93.so
414d4000-414f5000 r-xp 00000000 03:02 212168 /lib/i686/libm-2.2.93.so
414f5000-414f6000 rw-p 00021000 03:02 212168 /lib/i686/libm-2.2.93.so
414f6000-41506000 r-xp 00000000 00:16 41451916 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/i386/libverify.so
41506000-41508000 rw-p 0000f000 00:16 41451916 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/i386/libverify.so
41512000-4151d000 r-xp 00000000 03:02 1077166 /lib/libnss_nisplus-2.2.93.so
4151d000-4151e000 rw-p 0000a000 03:02 1077166 /lib/libnss_nisplus-2.2.93.so
4151e000-41527000 r-xp 00000000 03:02 1077163 /lib/libnss_nis-2.2.93.so
41527000-41528000 rw-p 00008000 03:02 1077163 /lib/libnss_nis-2.2.93.so
41528000-41548000 r-xp 00000000 00:16 41451918 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/i386/libjava.so
41548000-4154a000 rw-p 0001f000 00:16 41451918 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/i386/libjava.so
4154a000-4155e000 r-xp 00000000 00:16 41451922 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/i386/libzip.so
4155e000-41561000 rw-p 00013000 00:16 41451922 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/i386/libzip.so
415ab000-415c1000 r--s 00000000 00:16 33382828 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/sunrsasign.jar
415c1000-4169b000 r--s 00000000 00:16 33382890 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/jsse.jar
4169b000-416ac000 r--s 00000000 00:16 33382829 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/jce.jar
416ac000-41c05000 r--s 00000000 00:16 33383139 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/charsets.jar
41fb1000-41fcd000 r--s 00000000 00:16 57180507 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/ext/sunjce_provider.jar
41fcd000-41fda000 r--s 00000000 00:16 57180536 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/ext/ldapsec.jar
41fda000-41fea000 r-xp 00000000 00:16 41451947 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/i386/libnet.so
41fea000-41feb000 rw-p 0000f000 00:16 41451947 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/i386/libnet.so
42000000-42126000 r-xp 00000000 03:02 212166 /lib/i686/libc-2.2.93.so
42126000-4212b000 rw-p 00126000 03:02 212166 /lib/i686/libc-2.2.93.so
4212f000-43ab0000 r--s 00000000 00:16 33383140 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/rt.jar
4dab0000-4dc6f000 r--p 00000000 03:02 473322 /usr/lib/locale/locale-archive
4e2f3000-4e3af000 r--s 00000000 00:16 57180535 /.automount/vmsqe/root/export/nightly/mantis/JDK/c2_baseline/jdk1.4.2/j2sdk-1_4_2-beta-bin-b16-linux-i586-06_feb_2003/jre/lib/ext/localedata.jar

Heap at VM Abort:
Heap
 def new generation total 4160K, used 2971K [0x45ab0000, 0x45f30000, 0x461c0000)
  edenCurrent thread is 0xac056
Dumping core ...
 space 3712K, 79% used [0x45ab0000, 0x45d94cd8, 0x45e50000)
  from space 448K, 1% used [0x45ec0000, 0x45ec2198, 0x45f30000)
  to space 448K, 0% used [0x45e50000, 0x45e50000, 0x45ec0000)
 tenured generation total 4408K, used 2643K [0x461c0000, 0x4660e000, 0x49ab0000)
   the space 4408K, 59% used [0x461c0000, 0x46454fd8, 0x46455000, 0x4660e000)
 compacting perm gen total 16384K, used 2307K [0x49ab0000, 0x4aab0000, 0x4dab0000)
   the space 16384K, 14% used [0x49ab0000, 0x49cf0ff0, 0x49cf1000, 0x4aab0000)

pure virtual method called
--------------------------------