The Merlin nightly RE build failed. The log file is
/java/re/jdk/1.4.0/nightly/logs/oldlogs/
j2sdk-1_4_0-beta_refresh-b75-build-FAILED-08_07_2001_12-solsparcv9.log

The partially-built workspace and core file are saved here:
/net/mersparc.eng/usr/re/jdk/jdk1.4/ws.save.aug-07-01

I tried a build in my own workspace, and failed to reproduce this.
It remains to be seen whether this hits RE again on future nightlies.

Here's the tail of the log file:

if [ -s /net/mersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris-sparcv9/tmp/sun
/com.sun.tools.javah/javah/.classes.list ] ; then /net/mersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris-sparcv9/bin/sparcv
9/javac -J-XX:ThreadStackSize=1024 -J-Xms64m -J-Xmx128m -J-Xmaxf1 -classpath /n
et/mersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris-sparcv9/classes -bootclas
spath "/net/mersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris-sparcv9/lib/jce.
jar:/net/mersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris-sparcv9/lib/jsse.ja
r" -sourcepath "/net/mersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris-sparcv9
/gensrc:../../../../src/solaris/classes:../../../../src/share/classes" -d /net/m
ersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris-sparcv9/classes -source 1.4
    ../../../../src/share/classes/com/sun/tools/javah/Gen.java ../../../../src/s
hare/classes/com/sun/tools/javah/JNI.java ../../../../src/share/classes/com/sun/
tools/javah/JavahEnvironment.java ../../../../src/share/classes/com/sun/tools/ja
vah/LLNI.java ../../../../src/share/classes/com/sun/tools/javah/Main.java ../../
../../src/share/classes/com/sun/tools/javah/Mangle.java ../../../../src/share/cl
asses/com/sun/tools/javah/OldHeaders.java ../../../../src/share/classes/com/sun/
tools/javah/OldStubs.java ../../../../src/share/classes/com/sun/tools/javah/Util
.java ; fi

Unexpected Signal : 11 occurred at PC=0xFFFFFFFF7DB068C4
Function=JVM_GetStackAccessControlContext+0xD14
Library=/net/mersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris-sparcv9/lib/spa
rcv9/server/libjvm.so

Current Java thread:

Dynamic libraries:
0x100000000 /net/mersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris-sparcv9
/bin/sparcv9/javac
0xffffffff7f500000 /usr/lib/sparcv9/libthread.so.1
0xffffffff7f7f0000 /usr/lib/sparcv9/libdl.so.1
0xffffffff7f300000 /usr/lib/sparcv9/libc.so.1
0xffffffff7f7c0000 /usr/platform/SUNW,Ultra-60/lib/sparcv9/libc_psr.so.1
0xffffffff7d800000 /net/mersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris
-sparcv9/lib/sparcv9/server/libjvm.so
0xffffffff7f100000 /usr/lib/sparcv9/libCrun.so.1
0xffffffff7d600000 /usr/lib/sparcv9/libsocket.so.1
0xffffffff7d400000 /usr/lib/sparcv9/libnsl.so.1
0xffffffff7d200000 /usr/lib/sparcv9/libm.so.1
0xffffffff7f790000 /usr/lib/sparcv9/libw.so.1

0xffffffff7d000000 /usr/lib/sparcv9/libmp.so.2
0xffffffff7ce00000 /net/mersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris
-sparcv9/lib/sparcv9/native_threads/libhpi.so
0xffffffff7cc00000 /net/mersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris
-sparcv9/lib/sparcv9/libverify.so
0xffffffff7ca00000 /net/mersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris
-sparcv9/lib/sparcv9/libjava.so
0xffffffff7c800000 /net/mersparc/usr/re/jdk/jdk1.4/ws/control/build/solaris
-sparcv9/lib/sparcv9/libzip.so

Local Time = Tue Aug 7 12:15:28 2001
Elapsed Time = 4
#
# 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) 64-Bit Server VM (1.4.0-beta_refresh-b75 mixed mode)
#
# An error report file has been saved as hs_err_pid27207.log.
# Please refer to the file for further information.
#
Abort - core dumped
gnumake[5]: *** [.compile.classlist] Error 134
gnumake[5]: Leaving directory `/net/mersparc/usr/re/jdk/jdk1.4/ws/j2se/make/com/
sun/javah'