ZFS on 10-STABLE r281159: programs, accessing ZFS pauses for minutes in state [*kmem arena]

[Konstantin Belousov]

On Thu, Jul 30, 2015 at 03:39:05PM +0300, Lev Serebryakov wrote:
> Hello Konstantin,
> 
> Thursday, July 30, 2015, 3:18:40 PM, you wrote:
> 
> >>  rsync pauses for tens of minutes (!) after several hundreds of files. ^T
> >> and top shows state "[*kmem arena]". When I stop rsync with ^C and try to do
> >> "zfs list" it waits forever, in state "[*kmem arena]" again.
> > Show the output of sysctl debug.vmem_check.
>  It is 1.

So set it to zero.