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Date: Thu, 12 Nov 1998 07:51:03 +0800 (IS)
From: Alexandr Murin <maw@iaia.irk.ru>
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To: FreeBSD-gnats-submit@FreeBSD.ORG
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Subject: kern/8655: Umount trouble of SCSI removable device
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>Number:         8655
>Category:       kern
>Synopsis:       Umount trouble of SCSI removable device
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:
>Keywords:
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Nov 11 16:10:00 PST 1998
>Last-Modified:
>Originator:     Alexandr Murin
>Organization:
JSC "Irkutsk Aviation Industrial Association"
>Release:        FreeBSD 3.0-19980804-SNAP i386
>Environment:

	i133/32Mb RAM with SCSI AHA1540 on ISA bus

>Description:

	If I do:
	    1. umount /dev/od
	    2. fsck /dev/od0s1
	    3. Remove Optic Media
	    4. Insert Optic Media
	    5. mount /dev/ods1
	all ok.
	
	If I do this except (2) - I can't do (5). 
	Reason founded by fsck /dev/od0s1:
	"CLEAN FLAG NOT SET IN SUPERBLOCK"
	
	It is look like umount don't flush SCSI cash.

	If I do umount device with UFS, remove it, insert media with
	VFAT, try mount it - I get "System Panic" message and finally
	automatic reboot.

>How-To-Repeat:

	This repeat as often as I do Remove/Insert media.

>Fix:
	
	Try to run "fsck device" after dismount device, but this not good way.
	In 3.0-SNAP199802xx this trouble is not appeared.


>Audit-Trail:
>Unformatted:

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