The report for 6589823 includes a test case which fails with meet not symmetric but it's failing for different reasons.  From the comments of that report:

Please see Tester.java class generated by JITTester which fails the same
way starting from HS12-b03 (jdk7b26). The error is:

=== Meet Not Symmetric ===
t   =                   narrowoop: Tester_Class_2:TopPTR:exact *[int:48]:AnyNull:exact *,iid=-58
this=                   Tester_Class_0:AnyNull *
mt=(t meet this)=       java/lang/Object:NotNull:exact *,iid=-58
t_dual=                 narrowoop: Tester_Class_2:exact *[int:48]:NotNull:exact *,iid=58
this_dual=              Tester_Class_0:NotNull *
mt_dual=                java/lang/Object:AnyNull:exact *,iid=58
mt_dual meet t_dual=    narrowoop: Tester_Class_2:exact *[int:48]:NotNull:exact *
mt_dual meet this_dual= java/lang/Object:NotNull *
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc:  SuppressErrorAt=/type.cpp:541
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/BUILD_AREA/jdk7/hotspot/src/share/vm/opto/type.cpp:541), pid=12905, tid=1083214144
#  Error: meet not symmetric
#


The problem is not reproduced with HS12-b01 (jdk7b25).
The problem is -XX:+AggressiveOpts specific.

To reproduce the problem do something like:
1. ssh linux-amd64 machine
2. javac Tester.java
3. /net/sqenfs-1.sfbay/export1/jdk/re/7/promoted/all/b27/binaries/linux-amd64/fastdebug/bin/java  -Xcomp -d64 -server  -XX:+AggressiveOpts Tester

Running with +DoEscapeAnalysis alone it fails like this with current c2_baseline:

java -d64 -XX:+DoEscapeAnalysis -Xcomp Tester                             VM option '+DoEscapeAnalysis'
=== Meet Not Symmetric ===
t   =                   Tester_Class_2:TopPTR:exact *[int:48]:AnyNull:exact *,iid=-55
this=                   Tester_Class_0:AnyNull *
mt=(t meet this)=       java/lang/Object:NotNull:exact *,iid=-55
t_dual=                 Tester_Class_2:exact *[int:48]:NotNull:exact *,iid=55
this_dual=              Tester_Class_0:NotNull *
mt_dual=                java/lang/Object:AnyNull:exact *,iid=55
mt_dual meet t_dual=    Tester_Class_2:exact *[int:48]:NotNull:exact *
mt_dual meet this_dual= java/lang/Object:NotNull *
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc:  SuppressErrorAt=/type.cpp:552
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/net/smite.sfbay/export/ws/baseline/src/share/vm/opto/type.cpp:552), pid=16221, tid=9
#  Error: meet not symmetric
#
# Java VM: OpenJDK 64-Bit Server VM (13.0-b01-never-baseline-jvmg compiled mode solaris-sparc )
# An error report file with more information is saved as:
# /never/hs_err_pid16221.log
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
#
Current thread is 9
Dumping core ...
Abort (core dumped)

I think the problem is that mt, which is the value we're going to return, has an instance id which seems like it should have been stripped during the meet.
Posted Date : 2008-06-18 22:56:37.0

N/A

Incorrect instance_id is used for InstPtr->meet(AryPtr)
(and reverse) when types are not related (return j.l.Object*).
Posted Date : 2008-06-26 22:48:05.0