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Date:      Mon, 16 Jan 2012 17:35:34 +0100
From:      Ivan Voras <ivoras@freebsd.org>
To:        freebsd-current@freebsd.org
Subject:   Re: Data corruption over NFS in -current
Message-ID:  <jf1jkn$un8$1@dough.gmane.org>
In-Reply-To: <20120113143711.GA62486@cons.org>
References:  <20120111165714.GA46594@cons.org> <E9C4060A-0BD5-4187-BE1D-F46560C64366@lassitu.de> <20120111182110.GA75991@cons.org> <E1RlFsD-000OQB-Cr@kabab.cs.huji.ac.il> <20120113143711.GA62486@cons.org>

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On 13/01/2012 15:37, Martin Cracauer wrote:
> More findings.
>
> Reminder, with the original report I found:
> - files for no reason changing ownership and group to
>    root/<owngroupname>
> - data corruption as in inserting binary junk obviously from ports
> - data corruption as in malformed ascii text that might be a bug I
>    have in my code that is only exposed in FreeBSD

> I re-ran with newfs (reboot) which worked (all three problems absent).
>
> I then started building ports/land/gcc47 at the same time as I
> re-started my crazy script and it too only a few seconds for an
> unexpected ownership to root to occur.

Two more things to check:

1) Are you using tmpfs? Could you try without it?

2) Are you really sure your hardware is ok? If everything works fine 
after a reboot, it might mean that there is a memory corruption and you 
don't use that specific memory until some time after the reboot. Try 
running memtest86.




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