NetBSD Problem Report #23869
Received: (qmail 3343 invoked by uid 605); 24 Dec 2003 08:26:42 -0000
Message-Id: <20031224082642.3342.qmail@mail.netbsd.org>
Date: 24 Dec 2003 08:26:42 -0000
From: Christian Biere <christianbiere@gmx.de>
Sender: gnats-bugs-owner@NetBSD.org
To: gnats-bugs@gnats.netbsd.org
Subject: Deadlocks when writing to /dev/wd*
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>Number: 23869
>Category: kern
>Synopsis: Deadlocks when writing to /dev/wd*
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: kern-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Wed Dec 24 08:27:00 +0000 2003
>Closed-Date:
>Last-Modified:
>Originator: Christian Biere
>Release: NetBSD 1.6ZG
>Organization:
>Environment:
System: NetBSD cyclonus 1.6ZG NetBSD 1.6ZG (STARSCREAM) #0: Tue Dec 16 17:11:50 CET 2003 bin@cyclonus:/usr/build/arch/i386/compile/STARSCREAM i386
Architecture: i386
Machine: i386
>Description:
When I zero-out a disk with dd without using the raw device, newly started
processes hang in state "getnewbuf" and after a while (kernel) processes will
hang in "vnlock". I've found a description of this problem which shows that
this isn't a current one:
http://mail-index.netbsd.org/current-users/2001/03/07/0003.html
The first time this happened mutt also hung in state "getblk". I don't
know whether that was just a strange coincident. I successfully tried
to reproduce the problem as described above several times. Strangely,
after a reboot vim immediately hung in state "getblk" although I had
just rebooted and had not try to reproduce the problem. So maybe that's
another (new) problem with cgd(4) on which the $HOME is hosted.
>How-To-Repeat:
# dd if=/dev/zero of=/dev/wdXY bs=64k
Now try something from another vt or put dd in the background:
$ ls
Recognize how slow it starts. Try 'top' and see that new processes
hang in "getnewbuf" for quite a while.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
(Contact us)
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