java -d64 -XX:OldSize=4200M
crashes on solaris-sparcv9, solaris-amd64, linux-amd64. 4200M is not essential, the same failure occurs with 400M. This is reproducible with fastdebug build at least since b40. I cannot reproduce this with product build b59, however I see the same failure at
http://vmsqe.sfbay.sun.com/nightly/tiger/DTWS/results/11-08-05/ServerVM/64BITSOLSPARC/mixed/Gc_Baseline/vm.gc-NIGHTLY-Gc_Baseline-ServerVM-mixed-64BITSOLSPARC-2005-11-08-20-16-18/ResultDir/MemOptions/MemOptions.tlog

The following test fails because of this bug:
gc/64bit/quicklook/largeheap/MemOptions

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/adjoiningGenerations.cpp:27]
#
# An unexpected error has been detected by Java Runtime Environment:
#
# Internal Error (/BUILD_AREA/jdk6.0-64bit/hotspot/src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.cpp, 27 [ Unknown ]), pid=18530, tid=2
#
# Java VM: Java HotSpot(TM) 64-Bit Server VM (1.6.0-beta-fastdebug-b59-debug mixed mode)
#
# Error: assert(min_low_byte_size <= init_low_byte_size && init_low_byte_size <= max_low_byte_size,"Parameter check")
# An error report file with more information is saved as hs_err_pid18530.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#
Current thread is 2
Dumping core ...
Abort (core dumped)

Here is the stack trace
----------------- t@1 -----------------
0xffffffff7f0ca154 __lwp_wait + 0x8
0xffffffff7f0c5760 _thrp_join + 0x38
0xffffffff7f0c5900 thr_join + 0x10
0x00000001000071bc ContinueInNewThread + 0x30
0x0000000100001b78 main + 0x3a8
0x000000010000179c _start + 0x17c
----------------- t@2 -----------------
0xffffffff7f0ca124 _lwp_kill + 0x8
0xffffffff7f04620c abort + 0x118
0xffffffff7d897548 void os::abort(bool) + 0x138
0xffffffff7dbb7744 void VMError::report_and_die() + 0xd14
0xffffffff7dbb85a4 void crash_handler(int,siginfo*,void*) + 0x44
0xffffffff7f0c9030 __sighndlr + 0xc
0xffffffff7f0bd7a4 call_user_handler + 0x3e0
0xffffffff7d8c293c void ParallelScavengeHeap::print_on(outputStream*)const + 0x34
0xffffffff7dbb67e0 void VMError::report(outputStream*) + 0xc10
0xffffffff7dbb71d4 void VMError::report_and_die() + 0x7a4
0xffffffff7dbb85a4 void crash_handler(int,siginfo*,void*) + 0x44
0xffffffff7f0c9030 __sighndlr + 0xc
0xffffffff7f0bd7a4 call_user_handler + 0x3e0
0xffffffff7d119520 void frame::print_on_error(outputStream*,char*,int,bool)const + 0x30
0xffffffff7dbb6330 void VMError::report(outputStream*) + 0x760
0xffffffff7dbb71d4 void VMError::report_and_die() + 0x7a4
0xffffffff7d085b6c void report_assertion_failure(const char*,int,const char*) + 0x6c
0xffffffff7cdd0f60 AdjoiningGenerations::AdjoiningGenerations #Nvariant 1(ReservedSpace,unsigned long,unsigned long,unsigned long,unsigned long,unsigne
d long,unsigned long,unsigned long) + 0x90
0xffffffff7d8bf99c int ParallelScavengeHeap::initialize() + 0x62c
0xffffffff7db1ad34 int universe_init() + 0x49c
0xffffffff7d1b50b8 int init_globals() + 0x58
0xffffffff7dad8d88 int Threads::create_vm(JavaVMInitArgs*,bool*) + 0x2e8
0xffffffff7d362130 JNI_CreateJavaVM + 0x110
0x000000010000391c InitializeJVM + 0x134
0x0000000100001c64 JavaMain + 0xbc
0xffffffff7f0c8f04 _lwp_start