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kern/42531: system panic when unmounting a smb shared folder during poweroff

>Number:         42531
>Category:       kern
>Synopsis:       system panic when unmounting a smb shared folder during 
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Dec 27 15:55:00 +0000 2009
>Originator:     BaiYang
>Release:        5.0.1 / i386
NetBSD  5.0.1 NetBSD 5.0.1 (GENERIC) #0: Thu Jul 30 01:39:11 UTC 2009
I have installed NetBSD on a VMWare guest and the host is running a win2k3 

There are some C/C++ projects stored in the host system. I need compile this 
projects under NetBSD. So I mount several SMB share every time I want to 
compile something, and do the 'make'.

After everything is done, I shutdown the guest machine by using 'poweroff' 
command, At this time, if a "big" (contains thousands of source file) project 
just compiled, then the system will panic with something like this:

syncing disk ... done
unmounting file systems ... uvm_fault...
panic: trap

For a full screen shot, please check here:
Read and write many files on a smb folder, then poweroff.

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