kern/151905: [zfs] page fault under load in /sbin/zfs

[Mihai-Catalin Salgau]

>Number:         151905
>Category:       kern
>Synopsis:       [zfs] page fault under load in /sbin/zfs
>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 03 02:20:10 UTC 2010
>Closed-Date:
>Last-Modified:
>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 at 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:
>Unformatted: