Unable to mount the root fs on stable/8 r264339, GENERIC kernel, with MBR, FreeBSD slice, and UFS volume labels

[Claude Buisson]

On 04/16/2014 16:38, John Baldwin wrote:
> On Wednesday, April 16, 2014 5:41:44 am Claude Buisson wrote:
>> On 04/16/2014 10:09, Trond Endrestøl wrote:
>>> On Tue, 15 Apr 2014 19:44+0200, Trond Endrestøl wrote:
>>>
>>>> On Fri, 11 Apr 2014 18:38+0200, Trond Endrestøl wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I have a couple of uncritical systems running stable/8 r258344.
>>>>> Hardware is Dell OptiPlex GX260, BIOS A09, which is the latest rev.
>>>>>
>>>>> The r264339 GENERIC kernel are unable to mount the root fs from the
>>>>> hard drive using MBR, FreeBSD slice, and UFS volume labels.
>>>>>
>>>>> r258344 obviously can.
>>>>>
>>>>> I even tried regular device names like /dev/ad0s1a in /etc/fstab, and
>>>>> at the mountroot> prompt, i.e. ufs:/dev/ad0s1a. The kernel still
>>>>> cannot mount the root fs.
>>>>>
>>>>> The new kernel (r264339) does recognize the ad0 harddrive, and ad0 is
>>>>> listed as one of the GEOM managed disk devices; acd0 being the other
>>>>> one.
>>>>>
>>>>> Do I need to load additional geom modules, or is it a genuine bug?
>>>>>
>>>>> I have recreated the same conditions on a spare GX260, yes, I have
>>>>> plenty of them.
>>>>
>>>> I believe I have identified r262226 as the offending commit.
>>>>
>>>> Maybe the flags integer is set to a bad value before the calls to
>>>> resource_list_alloc().
>>>>
>>>> My spare system is currently recompiling r262221 of both world and
>>>> kernel, and I hope to confirm this assumption in a few hours.
>>>
>>> Confirmed.
>>>
>>>> If all goes well, I intend to move forward to the latest revision of
>>>> stable/8, back out the change done to sys/dev/pci/pci.c in r262226,
>>>> recompile world and kernel, install the kernel, and if successfully,
>>>> I'll install world as well.
>>>
>>> Confirmed, stable/8 r264519 with r262226 backed out does indeed work
>>> on a Dell OptiPlex GX260, BIOS A09.
>>>
>>
>> Just another data point related to r262226:
>>
>> Yesterday, I upgraded a stable/8 system from r260539 to r264426, which could not
>> finish booting. In my case, it stopped just after detecting an agp card (and
>> could boot if agp was disabled by device.hints).
>>
>> Reverting r262226 gave me back a fully usable system.
>>
>> This system is also a Dell, but a (oldish) Dimension 4550 BIOS A08.
>>
>>> Any chance anyone would like to dig deeper into the matter?
>>> Should I file a PR?
>>>
>>
>> I think so, if jhb (cced) keep being interested in stable/8..
>>
>> BTW, this morning I succeeded in booting a stable/10 snapshot r264194 USB stick
>> on this machine.
>
> Can you get a verbose dmesg with and without the change?
>

If r262226 is not reverted, the only way to boot and have a verbose dmesg is to 
disable agp. Is it OK ?

CBu