Nightly testing uncovered this failure:

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/tmp/jprt/P2/B/154324.ap159146/source/src/share/vm/utilities/numberSeq.cpp:177), pid=15885, tid=9
#  Error: guarantee(variance() > -1.0,"variance should be >= 0")
#
# JRE version: 7.0-b46
# Java VM: Java HotSpot(TM) 64-Bit Server VM (15.0-b01-2009- customer -10-154324.ap159146.hotspot-g1-allocspec-6700941-fastdebug mixed mode solaris-amd64 )
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
#
Posted Date : 2009-02-12 14:52:39.0

N/A

Even though it looks similar to 6785211 I think the cause is different. The failure in this CR was introduced by 6797754 and in particular this change:

+     if (!evacuation_failed()) {
        g1_policy()->record_pause_time((end_time_sec - start_time_sec)*1000.0);
+     }

So, if there was an evacuation failure, record_pause_time() was not called to notify the policy how long the pause time was. As a result the policy will pick up junk if it reads _last_pause_ms (which is the case here), or pick up an incorrect value (if _last_pause_ms) had been set by a previous pause.
Posted Date : 2009-02-12 14:52:39.0

http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/3698e8f47799
Posted Date : 2009-02-25 06:44:12.0

http://hg.openjdk.java.net/jdk7/hotspot/hotspot/rev/3698e8f47799
Posted Date : 2009-02-28 05:13:23.0