kern/41487: kern_descrip.c assertion failure

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>Number:         41487
>Category:       kern
>Synopsis:       kern_descrip.c assertion failure
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon May 25 09:20:00 +0000 2009
>Originator:     YAMAMOTO Takashi <yamt%mwd.biglobe.ne.jp@localhost>
>Release:        NetBSD 5.99.12
>Organization:

>Environment:
        
        
System: NetBSD amd64
>Description:
        with kern_descrip.c 1.192, while running build.sh,
        i got the following.  the process was cc.

panic: kernel diagnostic assertion "!fd_isused(fdp, fd)" failed: file "/siro/nbs
d/src/sys/kern/kern_descrip.c", line 175
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip ffffffff8023aacd cs 8 rflags 246 cr2  ffff800056a17000 
cpl 0 rsp ffff80008c4ef9e0
Stopped in pid 10470.1 (cc1) at netbsd:breakpoint+0x5:  leave
db{1}> bt
breakpoint() at netbsd:breakpoint+0x5
panic() at netbsd:panic+0x289
__kernassert() at netbsd:__kernassert+0x2d
fd_free() at netbsd:fd_free+0x377
exit1() at netbsd:exit1+0x121
sys_exit() at netbsd:sys_exit+0x53
syscall() at netbsd:syscall+0xc2
db{1}> 

>How-To-Repeat:
        
>Fix:
        

>Unformatted: