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Date: Wed, 2 Jan 2002 01:45:14 -0800 (PST)
From: Volker Paepcke <vpaepcke@incore.de>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: kern/33464: soft update inconsistencies after system crash
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>Number:         33464
>Category:       kern
>Synopsis:       soft update inconsistencies after system crash
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jan 02 01:50:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Volker Paepcke
>Release:        4.4-RELEASE / 5.0-CURRENT (12/29/2001)
>Organization:
Data-Service GmbH (www.incore.de)
>Environment:
FreeBSD portal.incore.de 4.4-RELEASE FreeBSD 4.4-RELEASE #0: Tue Dec  4 17:57:07 CET 2001     root@portal.incore.de:/usr/src/sys/compile/PORTAL  i386

FreeBSD bajor.franken.de 5.0-CURRENT FreeBSD 5.0-CURRENT #1: Tue Jan  1 18:54:38 CET 2002     root@bajor.franken.de:/home/obj/usr/src/sys/GENERIC  i386

>Description:
After a non-hardware crash where the system had no chance to flush its
buffers to disk (reset button, reboot -nq, reset from debugger) fsck
reports a soft update inconsistency in preen mode during restart:

Jan  2 10:18:01 bajor root: /dev/ad0s2g: LINK COUNT DIR I=253952  OWNER=root MODE=40775
Jan  2 10:18:01 bajor root: /dev/ad0s2g: SIZE=512 MTIME=Jan  2 10:14 2002  COUNT 2 SHOULD BE 3
Jan  2 10:18:01 bajor root: /dev/ad0s2g: LINK COUNT INCREASING
Jan  2 10:18:01 bajor root: /dev/ad0s2g: UNEXPECTED SOFT UPDATE INCONSISTENCY; RUN fsck MANUALLY.

From my understanding of soft updates (see http://www.mckusick.com/softdep/index.html) this should never
happen except after a power failure with write-cache enabled on the
disk or after media failures.
>How-To-Repeat:
Start extracting ports.tgz from FreeBSD installation CDROM into a soft updates enabled partition and hit reset after a few seconds. The result is the same on three different machines with ATA-, SCSI- (Adaptec-2940) and SCSI-RAID-Controllers (ICP-Vortex). Changing the write-cache settings on the disks/controllers has no effect and there was definitly no power loss during the crash.
>Fix:
      
>Release-Note:
>Audit-Trail:
>Unformatted:

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