kern/44961: Kernel crash on relookup() syscall

[emilianogavilan%gmail.com@localhost]

>Number:         44961
>Category:       kern
>Synopsis:       Kernel crash on relookup() syscall
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 13 12:30:00 +0000 2011
>Originator:     Emiliano Gavilán
>Release:        NetBSD 5.99.51
>Organization:
>Environment:
NetBSD beaujolais.vinotinto.com.ar 5.99.51 NetBSD 5.99.51 (GENERIC) #0: Thu May 
12 06:41:42 UTC 2011  
builds%b7.netbsd.org@localhost:/home/builds/ab/HEAD/amd64/201105120500Z-obj/home/builds/ab/HEAD/src/sys/arch/amd64/compile/GENERIC
 amd64
>Description:
Running the Tcl test suite (trunk version) crashes the NetBSD kernel.
Transcription of panic message follows:

panic: relookup: null name
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip ffffffff8023a7d5 cs 8 rflags 246 cr2  ffff800047f5d000 
cpl 0 rsp ffff800049bc0960
stopped in pid 3800.1 (tcltest) at      netbsd:breakpoint+0x5:  leave
db{0}> bt
breakpoint() at netbsd:breakpoint+0x5
panic() at netbsd:panic+0x2b9
relookup() at netbsd:relookup+0x9b
do_sys_rename() at netbsd:do_sys_rename+0x1a4
syscal() at netbsd:syscal+0xaa

>How-To-Repeat:
go to http://core.tcl.tk/tcl/info/trunk
log in as anonymous and download tarball
unpack and change to the unix directory
./configure && make tcltest && make test TESTFLAGS="-file Cmd.test"

>Fix: