On a diskless machine:
        ktrace ntpdate -d $someserver
gives an sure-fire panic:

../../../kern/kern_synch.c:429: sleeping with "process lock" locked from ../../.
./kern/subr_trap.c:76
Debugger("witness_sleep")
Stopped at      Debugger+0x40:  xorl    %eax,%eax
db> trace
Debugger(c02f20c0) at Debugger+0x40
witness_sleep(0,0,c02eeef8,1ad) at witness_sleep+0xfb
msleep(ccdfd2d8,0,4d,c02fbfce,0) at msleep+0x72
nfs_flush(ccdfd294,cce37980,1,cce25700,1) at nfs_flush+0x663
nfs_fsync(cce5cab4) at nfs_fsync+0x19
vinvalbuf(ccdfd294,1,cce37980,cce25700,0,0) at vinvalbuf+0x9f
nfs_vinvalbuf(ccdfd294,1,cce37980,cce25700,1) at nfs_vinvalbuf+0x114
nfs_write(cce5cbec,ccde6a40,cce25600,cce25888,cce5cbec) at nfs_write+0x120
ktrwrite(ccdfd294,ccde6a40,0,5) at ktrwrite+0x101
ktrpsig(ccdfd294,e,804a6b4,cce25888,0) at ktrpsig+0x78
postsig(e) at postsig+0xaa
userret(cce25700,cce5cd48,11,0,0) at userret+0x4a
syscall(2f,2f,2f,0,0) at syscall+0x2b4
syscall_with_err_pushed() at syscall_with_err_pushed+0x1b
--- syscall (4, FreeBSD ELF, write), eip = 0x280aac83, esp = 0xbfbffb50, ebp = 0
xbfbffb9c ---
db> 

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
[EMAIL PROTECTED]         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

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