Using 1.4.0-beta_refresh-b73 it seems that enabling method entry and
exit events is very unstable. Customer sees this both with hprof and their profiler product. We could reproduce this using the latest build (73) of merlin-beta release on Solaris/Linux platforms. Please note this happens only with Client VM.

To run it with hprof :

/home/raghuv/jdk1.4/bin/java -Xrunhprof:cpu=times -jar SwingSet2.jar
HPROF ERROR: thread local table NULL in method exit 9dbb4
HPROF ERROR: thread local table NULL in method exit 9dbb4
HPROF ERROR: thread local table NULL in method exit 9e564
HPROF ERROR : stack underflow in method exit
HPROF ERROR : stack underflow in method exit

Unexpected Signal : 11 occurred at PC=0xFE59C7D4
Function=[Unknown. Nearest: JVM_IsInterrupted+0xC30]
Library=/home/raghuv/jdk1.4/jre/lib/sparc/client/libjvm.so


Dynamic libraries:
0x10000 /home/raghuv/jdk1.4/bin/java
0xff350000 /usr/lib/libthread.so.1
0xff390000 /usr/lib/libdl.so.1
0xff200000 /usr/lib/libc.so.1
0xff330000 /usr/platform/SUNW,Ultra-5_10/lib/libc_psr.so.1
0xfe400000 /home/raghuv/jdk1.4/jre/lib/sparc/client/libjvm.so
0xff2d0000 /usr/lib/libCrun.so.1
0xff1e0000 /usr/lib/libsocket.so.1
0xff100000 /usr/lib/libnsl.so.1
0xff0d0000 /usr/lib/libm.so.1
0xff300000 /usr/lib/libw.so.1
0xff0b0000 /usr/lib/libmp.so.2
0xff080000 /home/raghuv/jdk1.4/jre/lib/sparc/native_threads/libhpi.so
0xff050000 /home/raghuv/jdk1.4/jre/lib/sparc/libverify.so
0xff020000 /home/raghuv/jdk1.4/jre/lib/sparc/libjava.so
0xfe7e0000 /home/raghuv/jdk1.4/jre/lib/sparc/libzip.so
0xfe150000 /home/raghuv/jdk1.4/jre/lib/sparc/libhprof.so
0xf3d00000 /home/raghuv/jdk1.4/jre/lib/sparc/libawt.so
0xfa480000 /home/raghuv/jdk1.4/jre/lib/sparc/libmlib_image.so
0xfc920000 /home/raghuv/jdk1.4/jre/lib/sparc/motif21/libmawt.so
0xf3a80000 /usr/dt/lib/libXm.so.4
0xfc810000 /usr/openwin/lib/libXt.so.4
0xfa7d0000 /usr/openwin/lib/libXext.so.0
0xfe100000 /usr/openwin/lib/libXtst.so.1
0xf3980000 /usr/openwin/lib/libX11.so.4
0xfa6a0000 /usr/openwin/lib/libdps.so.5
0xfa7b0000 /usr/openwin/lib/libSM.so.6
0xfa5d0000 /usr/openwin/lib/libICE.so.6
0xfa5a0000 /usr/openwin/lib/libdga.so.1
0xf3880000 /home/raghuv/jdk1.4/jre/lib/sparc/libfontmanager.so
0xfa460000 /home/raghuv/jdk1.4/jre/lib/sparc/libnio.so
0xfa440000 /usr/lib/libposix4.so.1
0xfa410000 /home/raghuv/jdk1.4/jre/lib/sparc/libnet.so
0xf43e0000 /usr/lib/libaio.so.1
0xf43c0000 /usr/lib//liblayout.so
0xf42b0000 /home/raghuv/jdk1.4/jre/lib/sparc/libjpeg.so
0xf43a0000 /home/raghuv/jdk1.4/jre/lib/sparc/libsunwjdga.so
0xf4290000 /home/raghuv/jdk1.4/jre/lib/sparc/libjdgaSUNWafb.so

Local Time = Tue Aug 14 11:42:07 2001
Elapsed Time = 180
#
# HotSpot Virtual Machine Error : 11
# Error ID : 4F530E43505002D7 01
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# Java VM: Java HotSpot(TM) Client VM (1.4.0-beta_refresh-b73 mixed mode)
#
# An error report file has been saved as hs_err_pid7834.log.
# Please refer to the file for further information.
#
Abort
 prithvi 89 =>

Please refer to Incident #129103 for this issue.


###@###.### 2001-08-15

The same test case when run on Linux with strace hangs instead of crash :

strace -o strace.out java -Xrunhprof:cpu=times -jar SwingSet2.jar

It just never got past the splash screen. No error messages and ps or top do not show any of the java threads consuming any CPU. The hanging situation is not consistent and can be more easily reproduced when run with strace utility.

Also, please note that this happens more with latest merlin-beta builds. I could n't reproduce it using build 65 & 73, but can reproduced more easily with build 74 & 75. Of course, it crashes eventually in the tests when it does n't hang.
Please note this is specific to Linux only. On other platforms, it just crashes.

Refer to Incident #129101 for hanging issue.