[Bug 197884] System with zfs freezes if emulators/virtualbox-ose got all ram

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197884

            Bug ID: 197884
           Summary: System with zfs freezes if emulators/virtualbox-ose
                    got all ram
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: vbox at FreeBSD.org
          Reporter: vvd at unislabs.com
          Assignee: vbox at FreeBSD.org
             Flags: maintainer-feedback?(vbox at FreeBSD.org)

10.1-p5 amd64, VirtualBox 4.3.12, 4.3.22, root on ZFS, virtual machines on ZFS.
Core 2 Quad Q6600, 8Gb RAM.
/boot/loader.conf have lines: 
vfs.zfs.arc_min="67108864"
vfs.zfs.arc_max="268435456"
vfs.zfs.prefetch_disable="1"

Run only 1 VM with different amount of RAM: 6.5Gb or 7Gb. VM is very active
using RAM.

If 7Gb: after few days (hours?) after run rebuilding of any port, system
freezes. Host replaying on ping (guest don't replay), but screen is black and
no response on ssh console.
Command "VBoxManage controlvm VMNAME savestate" freezes system too.
Command top show "ARC: xxxM Total" with xxx < 256Mb (~160-230). Swap is used on
~50-100Mb. Free 10-50Mb.

If 6.5Gb: all work fine after many weeks - ports rebuilding are work without
freezes, savestate and startvm work correctly too.
Command top show "ARC: xxxM Total" with xxx = 256Mb. Swap is used on ~0-50Mb.
Free ~200Mb.

Few times got same freezes on other hosts: Core i7 920 24Gb RAM with ~10-15
started VMs (RAM usage was near 23Gb).

Didn't tested with UFS.

P.S. Sorry for my English.

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