On 6/25/11 12:39 AM, Andrey Chernov wrote:
On Fri, Jun 24, 2011 at 09:09:08PM -0400, Justin T. Gibbs wrote:
>> No problem. I just set kern.geom.debugflags=4 in loader.conf and here is
>> new photo (with recent kernel, no patches):
>> http://img803.imageshack.us/img803/4679/25062011006.jpg
>> I skip all noisy parts related to ada0 and ada1 partitions probes.
>> As you can see, only 3 cd0-related geom call issued, right before cd1
>> probe shown. Strange thing is that I see no single cd1-related geom
>> call, but it may be because of hang.
>
> The GEOM processing is serialized, so that is not unexpected. What your
> logs are telling me is that the probe for CD0 is hanging. I don't know
> why.
Could you just postpone GEOM calls after any probe will be completed? It
seems GEOM goes here even before probe and waits for probe forever. What
probe waits in the same time is unclear for me (ccb_scan), but CD devices
are slow and may not survive such multisleeping, missing some
responses in
the middle.
The problem is not GEOM. It's not the thread waiting in ccb_scan - that
thread is designed to wait there until an asynchronous device
arrival/departure event occurs which is not the case here. The problem
is in
or below CAM, and that problem is causing the probe to never complete.
> Are you positive it is this specific SVN revision that prevents cd0
> from probing properly and not one of my previous CAM commits?
I use splitting by half method to find exact date which boots, then see
the next commit above that date. Pre-commit kernel goes to multiuser and
network is alive. I don't test CDs are working, I'll do that later and
report it.
So you know that revisions 223081, 223084, 223085, and 223089 all boot
just fine? I committed five revisions on that date. 223099 just happens
to be the last one for that day.
--
Justin
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