kern/41182: sddetach pmf panic during shutdown

[yamt%mwd.biglobe.ne.jp@localhost]

>Number:         41182
>Category:       kern
>Synopsis:       sddetach pmf panic during shutdown
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Apr 10 05:30:01 +0000 2009
>Originator:     YAMAMOTO Takashi <yamt%mwd.biglobe.ne.jp@localhost>
>Release:        NetBSD 5.99.10
>Organization:

>Environment:
        
        
System: NetBSD kaeru 5.99.10
Architecture: x86_64
Machine: amd64
>Description:

syncing disks... done
unmounting file systems...
unmounting /dev/pts (ptyfs)...
unmounting /kern (kernfs)...
unmounting /disks/wd0f (/dev/wd0f)...
unmounting /home (/dev/wd0e)...
unmounting / (/dev/wd0a)... done
panic: hook_disestablish: hook 0xffff80000f8f9e00 not established
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip ffffffff8023a3e5 cs 8 rflags 246 cr2  7f7ffd70e780 cpl 8 
rsp ffff800057d739b0
Stopped in pid 437.1 (reboot) at        netbsd:breakpoint+0x5:  leave
db{0}> t
breakpoint() at netbsd:breakpoint+0x5
panic() at netbsd:panic+0x289
hook_disestablish() at netbsd:hook_disestablish+0x5a
sddetach() at netbsd:sddetach+0x112
config_detach() at netbsd:config_detach+0x19d
pmf_system_shutdown() at netbsd:pmf_system_shutdown+0x77
cpu_reboot() at netbsd:cpu_reboot+0x2e
sys_reboot() at netbsd:sys_reboot+0x5f
syscall() at netbsd:syscall+0xc2
db{0}> 
        
>How-To-Repeat:
        
>Fix:
        

>Unformatted: