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Message-Id: <201011030212.oA32CgBO087847@www.freebsd.org>
Date: Wed, 3 Nov 2010 02:12:42 GMT
From: Mihai-Catalin Salgau <csalgau-br@bitdefender.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: [zfs] page fault under load in /sbin/zfs
X-Send-Pr-Version: www-3.1
X-GNATS-Notify:

>Number:         151905
>Category:       kern
>Synopsis:       [zfs] page fault under load in /sbin/zfs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-fs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Nov 03 02:20:10 UTC 2010
>Closed-Date:    
>Last-Modified:  Fri Nov  5 15:50:06 UTC 2010
>Originator:     Mihai-Catalin Salgau
>Release:        8.1-STABLE
>Organization:
>Environment:
FreeBSD host.local 8.1-STABLE FreeBSD 8.1-STABLE #0: Mon Nov  1 02:46:57 EET 2010     root@host.local:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
System load:
Around 20 zfs clone/destroy operations every couple of minutes and about 200 permanent containers. Data served from within clones to scripts. During this time system load spikes to 12.0+, runs around 8.0.
System has 8 cores, 16 GB RAM, of which vm.kmem_size="10G", vfs.zfs.arc_max="8G".
Screencap of panic: http://img64.imageshack.us/img64/2903/021110zfscrash.jpg
Scrubs found no problems.
>How-To-Repeat:
Unknown. Usually load dependant. Did happen one when working with only one core hammered to 100%.
>Fix:


>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-fs 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Fri Nov 5 07:52:17 UTC 2010 
Responsible-Changed-Why:  
Over to maintainer(s). 

http://www.freebsd.org/cgi/query-pr.cgi?pr=151905 

From: Andriy Gapon <avg@icyb.net.ua>
To: bug-followup@FreeBSD.org, csalgau-br@bitdefender.com
Cc:  
Subject: Re: kern/151905: [zfs] page fault under load in /sbin/zfs
Date: Fri, 05 Nov 2010 15:18:41 +0200

 Judging from the screenshot the panic is in fuse_statfs.
 So, most likely it's a fuse problem, not ZFS.
 
 -- 
 Andriy Gapon

From: Mihai-Catalin Salgau <csalgau-br@bitdefender.com>
To: bug-followup@FreeBSD.org, csalgau-br@bitdefender.com
Cc:  
Subject: Re: kern/151905: [zfs] page fault under load in /sbin/zfs
Date: Fri, 5 Nov 2010 17:22:21 +0200

 Hello Bug-followup,
 
   You're right. I totally missed that.
   I was used to not getting the stack in 8.0-RELEASE and I mostly skipped i=
 t.
   Could having an unmounted fuse device reading from a file in a zfs file s=
 ystem during a destroy operation cause this?
  =20
   Thanks
 
>Unformatted:
