From owner-freebsd-stable@freebsd.org  Thu Jul 28 11:29:58 2016
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Subject: Re: swapoff: Cannot allocate memory FreeBSD 11 Beta2
To: freebsd-stable@freebsd.org
References: <2601b5e7-8611-d4a3-9d24-4e727f60ad7a@gmail.com>
From: Volodymyr Kostyrko <arcade@b1t.name>
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Date: Thu, 28 Jul 2016 14:21:36 +0300
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Johan Hendriks wrote:
> Hello all.
>
> Lately I noticed above (error) when I reboot machine.
>
> It looks like this.
>
> Stopping cron.
> Waiting for PIDS: 1183
> swapoff: /dev/gpt/swap-9M286954: Cannot allocate memory
> stopping zfsd.
> Waiti......
>
> My swap space concists of two GPT swap partitions on the zfs mirror OS
> disks, both 4GB each.
> The machine has 4 GB mem.
>
> This does not happen after normal use, but if i wait a day, do a
> buildworld then the swapoff error shows.
>
> content off /etc/fstab
>
> /dev/gpt/swap-Z3TX7DTA   none           swap    sw      0       0
> /dev/gpt/swap-9M286954   none           swap    sw      0       0

I think you are bitten by a bad swapoff logic. I made patch for it eons ego:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187081

 From my point of view swapping off from non-late swap devices is just a 
waste of time.

-- 
Sphinx of black quartz judge my vow.