NetBSD Problem Report #18975

Received: (qmail 18867 invoked by uid 605); 8 Nov 2002 16:54:13 -0000
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Date: Sat, 09 Nov 2002 01:53:13 +0900
From: yamt@mwd.biglobe.ne.jp
Sender: gnats-bugs-owner@netbsd.org
Reply-To: yamt@mwd.biglobe.ne.jp
To: gnats-bugs@gnats.netbsd.org
Subject: lfs_bmapv + dounmount deadlock
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>Number:         18975
>Category:       kern
>Synopsis:       lfs_bmapv + dounmount deadlock
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Nov 08 16:55:05 +0000 2002
>Closed-Date:    
>Last-Modified:  
>Originator:     YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
>Release:        NetBSD 1.6K
>Organization:

>Environment:


System: NetBSD kaeru 1.6K NetBSD 1.6K (build.kaeru) #170: Sat Nov 9 00:41:22 JST 2002 takashi@kaeru:/usr/home/takashi/work/kernel/build.kaeru i386
Architecture: i386
Machine: i386
>Description:
	1. cleaner thread calls lfs_bmapv. it calls vfs_busy.
	2. another thread set MNT_UNMOUNT in dounmount.
	3. cleaner thread wakes up and vfs_busy again in getnewvnode.
	4. => deadlock
>How-To-Repeat:
	try to unmount a lfs partition when cleaner is active.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:

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