FULL PRODUCT VERSION :
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Server VM (build 1.6.0-b105, mixed mode)

or

java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux io 2.6.11.4-21.11-smp #1 SMP Thu Feb 2 20:54:26 UTC 2006 i686 i686 i386 GNU/Linux

Linux dio 2.6.9-42.0.3.ELsmp #1 SMP Mon Sep 25 17:28:02 EDT 2006 i686
i686 i386 GNU/Linux

Linux gorm 2.6.19.1-mactel.mactel-061225 #1 SMP PREEMPT Mon Dec 25 19:17:52 CET
2006 i686 GNU/Linux

Linux novo 2.4.21-37.0.1.ELsmp #1 SMP Wed Jan 11 18:44:17 EST 2006 i686 i686 i386 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
JVM 1.6 is very unstable. In an application based on the netbeans rich client platform we observe a lot of JVM crashes (see attached hs_err_xxx file, if you need more please contact me - we have dozens of them). We checked on different computers with different OS versions (see above). Since we use 1.6 features we unfortunately cannot go back to 1.5.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
No simple testcase available yet. Crashes happen during program start, while the program is running and during program shutdown.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
JVM should not crash.
ACTUAL -
JVM crashes

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Attached seperatly

REPRODUCIBILITY :
This bug can be reproduced often.