Freebsd 11.0 - system freeze on intensive I/O

[Gleb Popov]

On Wed, Aug 9, 2017 at 12:52 PM, Eugene Grosbein <eugen at grosbein.net> wrote:

> 09.08.2017 14:11, Gautam пишет:
> > 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.
> >
> > http://marc.info/?l=freebsd-questions&m=150088763825675&w=2
> >
> > I raised a PR - 220971 ; but there are no backtraces / logs etc. that
> could
> > possibly help.
> >
> > I would like to help narrow this down, but do not know how. Any
> suggestions
> > on how to debug a system freeze and what I need to do ? I could then try
> to
> > reproduce this and collect the needed information - traces etc.
>
> Swapfile is definitely broken in supported FreeBSD releases, it hangs the
> system.
> The only known workaround (to me) is not using it.
>
>
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I'm using swap on ZFS, and still see the problem, so this might not be tied
to swapfile.