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port-amd64/43236: Removing a file while it is accessed through NFS crashes the server

>Number:         43236
>Category:       port-amd64
>Synopsis:       Removing a file while it is accessed through NFS crashes the 
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 02 08:55:00 +0000 2010
>Originator:     Peter Kerwien
>Release:        NetBSD 5.0.2_PATCH
NetBSD server1 5.0.2_PATCH NetBSD 5.0.2_PATCH (MYKERNEL) #1: Tue Apr 27 
22:24:35 CEST 2010  root@server1:/usr/obj/sys/arch/amd64/compile/MYKERNEL amd64

I accidently removed a file that at the same time was played on my media player 
(Popcorn Hour). The file were accessed over NFS. After this the server stopped 
responding. It only answered on ping. SSH, local login etc all failed. I was 
logged in via SSH when I removed the file.

Today I tried to reproduce this. So I started to play another movie. This time 
I was logged in directly to the server. When I type the rm command I 
immediately started to see some error message, and some numbers starting to 
count down from approx 3600 to zero. Then the server freeezed and I had to do a 
hard reset.

Export some files via NFS. While playing e.g. a movie on another computer or 
mediaplayer, delete this file on the server. The server should crash.

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