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[Mehrdad Moradi <mehrmor88@xxxxxxxxx>]

same problem here.

It happens randomly, albeit it seems as though dragging and dropping
editor tabs is very likely to make Netbeans crash.

-- 
experiencing frequent netbeans crashing
https://bugs.launchpad.net/bugs/398280
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Status in “openjdk-6” package in Ubuntu: Confirmed

Bug description:
The last 3 errors all look like this (pids being different of course).  All mention nmethod.cpp line 1836, JavaThread "AWT-EventQueue-1", and libjvm.so.  I can't deliberately reproduce the error but if I run netbeans for long enough it will crash.

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (nmethod.cpp:1836), pid=10665, tid=140316030511440
#  Error: guarantee(cont_offset != 0,"unhandled implicit exception in compiled code")
#
# Java VM: OpenJDK 64-Bit Server VM (14.0-b08 mixed mode linux-amd64 )
# Distribution: Ubuntu 9.04, package 6b14-1.4.1-0ubuntu10
# If you would like to submit a bug report, please include
# instructions how to reproduce the bug and visit:
#   https://bugs.launchpad.net/ubuntu/+source/openjdk-6/
#

---------------  T H R E A D  ---------------

Current thread (0x0000000000aaf000):  JavaThread "AWT-EventQueue-1" [_thread_in_Java, id=11553, stack(0x00007f9ddf07a000,0x00007f9ddf27b000)]

Stack: [0x00007f9ddf07a000,0x00007f9ddf27b000],  sp=0x00007f9ddf277d60,  free space=2039k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x66e7ef]
V  [libjvm.so+0x66eb51]
V  [libjvm.so+0x2cdc26]
V  [libjvm.so+0x52b006]
V  [libjvm.so+0x5bb6e9]
V  [libjvm.so+0x54f017]