PVR250 hanging

Greg 'groggy' Lehey grog at FreeBSD.org
Wed Nov 29 08:00:31 UTC 2006


Sorry for the slow response; I wanted to check with our machine, and
it was needed for other things.

On Wednesday, 22 November 2006 at 17:30:35 -0500, Randy Pratt wrote:
> On Thu, 23 Nov 2006 08:41:36 +1030 Greg 'groggy' Lehey <grog at FreeBSD.org> wrote:
>
>> On Wednesday, 22 November 2006 at 16:51:41 -0500, Randy Pratt wrote:
>
>>> I've had several freezes/hangs where the system is unresponsive and
>>> keyboard won't accept input forcing a power recycling and fsck.
>>
>> This seems more than just cxm, then.
>>
>> In general, if you're seeing this kind of behaviour, the output of
>> 'ps l' is of interest.  The WMCHAN field gives information about where
>> (and maybe how) the process is waiting.
>
> # ps -auxwwl | grep cxm
> root    1156  0.7  0.1  1280   664  p1  S+    5:24PM   0:00.30 cat /dev/cxm0        0   821   0   0  0 cmxrd
> root     826  0.0  0.0     0     8  ??  WL    4:33PM   0:00.03 [irq19: cxm0]        0     0   0 -60  0 -

OK, this looks pretty much like lack of input.  cat is waiting for the
completion of a read operation.

>> When I get access to our PVR 250 later today, I'll compare some of
>> your other data.
>
> Great!  I'd appreciate anything you can look at.  I'm also willing to
> do any sort of patching/testing if needed.  The box isn't anything
> critical.

Unfortunately, I can't see anything like this in our application.
There are plenty of other bugs, but I suspect that they're mainly of
our own making.

Greg
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