Gkrellmd prompts "sleeping thread"

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For whatever reason I seem to be able to reliably reproduce a panic on
- -current by running gkrellmd on one of my machines yet another (this
one) has no problems at all :-(

Any thoughts welcome ..

mail# more info.0
Dump header from device /dev/ar0s1b
  Architecture: i386
  Architecture Version: 2
  Dump Length: 97525760B (93 MB)
  Blocksize: 512
  Dumptime: Sun Oct  7 17:15:51 2007
  Hostname: mail.auburn.protected-networks.net
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 7.0-CURRENT #1: Thu Oct  4 22:33:53 EDT 2007
    root_at_mail.auburn.protected-networks.net:/usr/obj/usr/src/sys/AUBURN
  Panic String: sleeping thread
  Dump Parity: 3933400909
  Bounds: 0
  Dump Status: good

mail# kgdb /boot/kernel.old/kernel vmcore.0
kgdb: kvm_nlist(_stopped_cpus):
kgdb: kvm_nlist(_stoppcbs):
[GDB will not be able to debug user-mode threads:
/usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 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 "i386-marcel-freebsd".
(no debugging symbols found)...Attempt to extract a component of a value
that is not a structure pointer.
(kgdb) bt
#0  0xc059f32b in doadump ()
#1  0xc059f7a4 in boot ()
#2  0xc059fb18 in panic ()
#3  0xc05cf172 in propagate_priority ()
#4  0xc05cfa66 in turnstile_wait ()
#5  0xc0593f11 in _mtx_lock_sleep ()
#6  0xc0676011 in intsmb_rawintr ()
#7  0xc0583a4d in ithread_loop ()
#8  0xc0580774 in fork_exit ()
#9  0xc07058a0 in fork_trampoline ()
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