rebuilt release 4.99.39 today, jemalloc.c 1.15, startkde dumps the 
following core files on startup and gdb on alpha does not give much data-
casey229: {13} cd core_dumps
casey229: {14} ls -l *
-rw-------  1 mel  users  3130096 Dec  4 06:24 artsshell.core
-rw-------  1 mel  users  1516768 Dec  4 06:23 dcop.core
-rw-------  1 mel  users  1756816 Dec  4 06:23 kde-config.core
-rw-------  1 mel  users  2493752 Dec  4 06:23 kdeinit.core
-rw-------  1 mel  users  2179232 Dec  4 06:23 ksmserver.core
-rw-------  1 mel  users  2469464 Dec  4 06:23 ksplash.core
casey229: {15} gdb -core ksmserver.core
GNU gdb 6.5
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain 
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "alpha--netbsd".
Core was generated by `ksmserver'.
Program terminated with signal 11, Segmentation fault.
#0  0x0000000000000000 in ?? ()
moving userland back to 4.99.33 allows kde to start. Any suggestions 
welcome-
mel