bin/65223: fsck of 5.2 makes UFS1 inconsistent for 4.9

[Hanspeter Roth]

>Number:         65223
>Category:       bin
>Synopsis:       fsck of 5.2 makes UFS1 inconsistent for 4.9
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Apr 05 12:50:30 PDT 2004
>Closed-Date:
>Last-Modified:
>Originator:     Hanspeter Roth
>Release:        FreeBSD 5.2.1-RELEASE i386
>Organization:
>Environment:
System: FreeBSD snoopy.here 5.2.1-RELEASE FreeBSD 5.2.1-RELEASE #1: Sat Apr 3 21:00:55 CEST 2004 hampi at snoopy.here:/usr/src/sys/i386/compile/D5 i386
	FreeBSD 4.9
>Description:
	Fsck of 5.2.1 makes modifications on UFS1 that makes the file system
	inconsistent for a fsck of 4.9. The fsck of 4.9 reports

	FREE BLK COUNT(S) WRONG IN SUPERBLOCK
	SALVAGE [yn]

>How-To-Repeat:
	Boot 5.2.1 and mount a UFS1 which was created under 4.9.
	Start copying a big file to the UFS1. After one second press the
	reset button in order to leave an inconsistent UFS1.
	Boot 5.2.1 again and run fsck on the UFS1.
	Reboot 4.9 in single user mode and run fsck on the UFS1 that had
	been fscked by 5.2.1
>Fix:
	none so far


>Release-Note:
>Audit-Trail:
>Unformatted: