Date: Wed, 1 Aug 2012 01:20:00 +0100 From: Attilio Rao <attilio@freebsd.org> To: Yuri <yuri@rawbw.com> Cc: freebsd-hackers@freebsd.org Subject: Re: How to diagnose system freezes? Message-ID: <CAJ-FndCEswmVqSK7TR=ZfcGCrQkvV7us-dHFL%2BSsZ0BnjqMzvA@mail.gmail.com> In-Reply-To: <501871FD.601@rawbw.com> References: <501871FD.601@rawbw.com>
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On 8/1/12, Yuri <yuri@rawbw.com> wrote: > One of my 9.1-BETA1 systems periodically freezes. If sound was playing, > it would usually cycle with a very short period. And system stops being > sensitive to keyboard/mouse. Also ping of this system doesn't get a > response. > I would normally think that this is the faulty memory. But memory was > recently replaced and tested with memtest+ for hours both before and > after freezes and it passes all tests. > One out of the ordinary thing that is running on this system is nvidia > driver. But the freezes happen even when there is no graphics activity. > Another out of the ordinary thing is that the kernel is built for > DTrace. But DTrace was never used in the sessions that had a freeze. > > What is the way to diagnose this problem? Start by adding SW_WATCHDOG to your machine with a reasonably low timeout. Also, can you use a serial console? If yes you may consider going with a serial break. Attilio -- Peace can only be achieved by understanding - A. Einstein
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