Boot hangs on v9 system at CD device probe

[Kevin Oberman]

On Thu, May 31, 2012 at 9:10 AM, Kevin Oberman <kob6558 at gmail.com> wrote:
> On Thu, May 31, 2012 at 4:02 AM, Marius Strobl
> <marius at alchemy.franken.de> wrote:
>> On Wed, May 30, 2012 at 05:13:44PM -0600, Ian Lepore wrote:
>>> On Wed, 2012-05-30 at 14:54 -0700, Kevin Oberman wrote:
>>> > I sent a note about this a couple of weeks ago, but have not heard
>>> > anything. I'm really getting a bit desperate.
>>> >
>>> > I have a system that I am trying to upgrade from 8.2 to 9.0. I have
>>> > built it and installed the kernel, but it fails to boot. The boot
>>> > freezes after probing for my hard drives during the probe of the
>>> > CDROM. It just sits there, seemingly forever, though I have never
>>> > waited longer then a few minutes.
>>> >
>>> > The system is a SuperMicro C25BX mother board. The DVD is PATA,
>>> > reported on boot of 8-Stable as:
>>> > acd0: DVDR <ATAPI DVD A DH20A4P/9P59> at ata2-master UDMA66
>>> >
>>> > If I unplug the CDROM, it boots fine, but I really need the device on
>>> > the system, so I really can't leave it unplugged. Also, after the 9
>>> > kernel is installed, my Mk file have been updated so that I can't
>>> > build some ports if I boot the 8.2 kernel. Does anyone remember this
>>> > being reported by others? It was most likely on current, as it was
>>> > probably prior to the release of 9. I googled around, but could not
>>> > find it.
>>> >
>>> > I'd really appreciate it if anyone can point me toward a solution.
>>> >
>>> > Thanks,
>>>
>>> When faced with a mystery like this I sometimes go into the mode of
>>> "poke it with a stick and see if it twitches."  If you can get it to
>>> twitch at all, maybe that's a starting point.  In this case, I guess I
>>> might start with seeing if setting hw.ata.atapi_dma=0 in the loader
>>> makes any difference.
>>>
>>
>> Note that hw.ata.atapi_dma isn't honored by 9.0 with options ATA_CAM
>> (default in GENERIC). Support for that loader tuneable was only
>> resurrected rather recently (but is available in stable/9). The
>> equivalent for 9.0 would be setting hint.ata.X.mode to PIO4 where
>> X is the number of the ata(4) device attached for the channel the
>> CDROM is connected to.
>> ATA_CAM is indeed known to break ATAPI DMA for some ATA controllers
>> though. What's the `pciconf -lv` output for this one?
>
> Good point. I had forgotten about the hw.ata.atapi_dma removal and was
> not even awarethat it had been recently re-enabled.
> My controller is:
> atapci0 at pci0:17:4:0:    class=0x010185 card=0x82131283 chip=0x82131283
> rev=0x00 hdr=0x00
>    vendor     = 'Integrated Technology Express (ITE) Inc'
>    device     = 'IDE Controller (IT8213F)'
>    class      = mass storage
>    subclass   = ATA
>
> It is used ONLY for the CD/DVD as all other disks use the 3ware RAID controller.
>
> Unfortunately, the system is not located where I am, so I can't really
> try anything until I get over there. Maybe later today I can run into
> that office and try some of the suggestions. I can certainly build a
> kernel without ATA_CAM.

I just did the obvious as suggested and built a kernel without ATA_CAM
and with atapicam. It boots fine and I have my CD/DVD working on 9.0.
Clearly, there is some issue with ATAPI drives with ATA_CAM as others
have seen the same thing. It is entirely possible that a serial
connected drives don't have this issue. It does look like there is
some locking issue between CAM and GEOM under some circumstances. I
worry that 10 will lose support for other than ATA_CAM and that the
work-around will no longer be available. Of course, if ahci fixes it,
the problem will go away on systems that support it.

Next time I get to the system I will try putting ATA_CAM back and
adding ahci and report on the results.

Thanks for the suggestions!
-- 
R. Kevin Oberman, Network Engineer
E-mail: kob6558 at gmail.com