On 7/31/12 5:02 PM, Yuri 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?
The answer depends on a number of things but an NMI can be useful if
you have some way of
generating them. (some IPMI implementations can allw you to generate
them and some motherboards have
jumpers to allow you to attach a 'nmi-button'.
The fact that ping is not responsive is important, as that is done at
a very low level but
it may still be alive down there somewhere.
Make sure you have debugging enabled in your kernel. That will catch
quite a few 'hangs'.
as also mentioned by others... a serial console and DDB may also be
useful in some hangs.
Julian
CPU: i7 CPU 920 @ 2.67GHz
Memory: 24GB
MB: P2T
Yuri
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