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Date: Wed, 11 Dec 2013 06:02:13 GMT
From: Richard Kojedzinszky <krichy@cflinux.hu>
To: freebsd-gnats-submit@FreeBSD.org
Subject: ZFS snapshot umount kernel panic
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>Number:         184677
>Category:       kern
>Synopsis:       [zfs] [panic] ZFS snapshot umount kernel panic
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-fs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Dec 11 06:10:00 UTC 2013
>Closed-Date:    
>Last-Modified:  Wed Apr 16 01:03:10 UTC 2014
>Originator:     Richard Kojedzinszky
>Release:        stable/10, releng/9.2
>Organization:
>Environment:
FreeBSD freebsd10 10.0-PRERELEASE FreeBSD 10.0-PRERELEASE #9 57a89d6(stable/10)-dirty: Mon Dec  9 11:11:30 CET 2013     root@freebsd10:/usr/obj/usr/src/sys/BSD  amd64
>Description:
Accessing ZFS snapshots and unmounting them parallell causes the system to panic. 

In a real server setup, where unix users exists, they are able to access
.zfs/snapshot/ directories, which causes snapshots to be mounted. The
system may be set up to clean those mounts, umount them at some time. Then
a panic may occur.
>How-To-Repeat:
Run the script at http://pastebin.com/Bf15sMhd on an empty ZFS dataset
with a snapshot.
>Fix:


>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-fs 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Wed Apr 16 01:02:38 UTC 2014 
Responsible-Changed-Why:  
Over to maintainer(s). 

http://www.freebsd.org/cgi/query-pr.cgi?pr=184677 
>Unformatted:
