Date: Tue, 22 May 2018 08:17:00 -0400 From: Steve Wills <swills@FreeBSD.org> To: Alexander Leidinger <Alexander@leidinger.net>, current@freebsd.org Subject: Re: Deadlocks / hangs in ZFS Message-ID: <fa263af4-9bf7-88f8-8d23-21456daf7960@FreeBSD.org> In-Reply-To: <20180522101749.Horde.Wxz9gSxx1xArxkYMQqTL0iZ@webmail.leidinger.net> References: <20180522101749.Horde.Wxz9gSxx1xArxkYMQqTL0iZ@webmail.leidinger.net>
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I may be seeing similar issues. Have you tried leaving top -SHa running
and seeing what threads are using CPU when it hangs? I did and saw pid
17 [zfskern{txg_thread_enter}] using lots of CPU but no disk activity
happening. Do you see similar?
Steve
On 05/22/18 04:17, Alexander Leidinger wrote:
> Hi,
>
> does someone else experience deadlocks / hangs in ZFS?
>
> What I see is that if on a 2 socket / 4 cores -> 16 threads system I do
> a lot in parallel (e.g. updating ports in several jails), then the
> system may get into a state were I can login, but any exit (e.g. from
> top) or logout of shell blocks somewhere. Sometimes it helps to CTRL-C
> all updates to get the system into a good shape again, but most of the
> times it doesn't.
>
> On another system at the same rev (333966) with a lot less CPUs (and AMD
> instead of Intel), I don't see such a behavior.
>
> Bye,
> Alexander.
>
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