From owner-freebsd-hackers@freebsd.org  Wed Aug  9 10:38:07 2017
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Subject: Re: Freebsd 11.0 - system freeze on intensive I/O
To: Konstantin Belousov <kostikbel@gmail.com>, Gautam <list@execve.net>
References: <CAD9pFYAAy8jKcABNTun-Y3knrbUreQ7q1-CCj=323HgLMC5e6g@mail.gmail.com>
 <20170809084546.GQ1700@kib.kiev.ua>
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From: Eugene Grosbein <eugen@grosbein.net>
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Date: Wed, 9 Aug 2017 17:37:26 +0700
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09.08.2017 15:45, Konstantin Belousov wrote:

> On Wed, Aug 09, 2017 at 12:41:02PM +0530, Gautam wrote:
>> Hi,
>>
>> I raised this topic on freebsd-questions where I suspect a bug caused due
>> to swapfile usage on FreeBSD.
>>
>> You could read details in the below thread, but summary is that with using
>> a swapfile (not a swap partition) the system freezes on some single process
>> intensive I/O. This is 100% reproducible.
> Also this is expected.

It worked reliably at least for 6.x/i386 versions

I was forced to perform re-partitioning acrobatics
for a couple of remote FreeBSD 9.x production systems
to increase swap partition size to be able to do source upgrade
after failed attempts to use swapfile over UFS, it hangs.