kern/105390: filesystem on a md backed by sparse file with softupdates enabled leads to wdrain livelock.

trasz trasz at pin.if.uz.zgora.lp
Fri Nov 10 21:11:16 UTC 2006


>Number:         105390
>Category:       kern
>Synopsis:       filesystem on a md backed by sparse file with softupdates enabled leads to wdrain livelock.
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Nov 10 21:10:36 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     trasz
>Release:        6.2-pre
>Organization:
>Environment:
FreeBSD traszkan.ds7 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #1: Mon Oct 30 07:41:21 CET 2006     trasz at traszkan.ds7:/usr/obj/usr/src/sys/TRASHCAN  i386
>Description:
Take a filesystem low on free space.  Create big sparse file, 'mdconfig -af' it, create
geli on it, mount and start moving files from the 'outer' filesystem (the one on which sparse file is created) to the 'inner' (encrypted with eli) one.  If outer one has softupdates enabled, move will soon stop on 'wdrain'.  Disabling softupdates makes the problem dissappear.

>How-To-Repeat:

>Fix:

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


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