On Fri, Nov 13 2015, Harald Hoyer wrote:

> On 13.11.2015 13:37, Harald Hoyer wrote:
>> On 12.10.2015 22:30, Neil Brown wrote:
>>> Harald Hoyer <har...@redhat.com> writes:
>>>
>>>> On 12.10.2015 05:02, Neil Brown wrote:
>>>>>
>>>>> If I have booted a kernel with md/raid built in (no modules) and
>>>>> I use dracut to build the initramfs for a different kernel which
>>>>> has the md code compiled as separate modules, then it does not include
>>>>> the required md modules in the initramfs.
>>>>>
>>>>> As a particular instance this happen when the root filesystem is on
>>>>> RAID0.  The 'raid0.ko' module is not included and boot fails.
>>>>>
>>>>> https://bugzilla.opensuse.org/show_bug.cgi?id=935993
>>>>>
>>>>> This only happens when 'host-only' is selected (which is the default for
>>>>> openSUSE).
>>>>>
>>>>> the modules.d/90mdraid/module-setup.sh code calls
>>>>>
>>>>>     instmods =drivers/md
>>>>>
>>>>> instmods calls
>>>>>    module_is_host_only "raid0"
>>>>> and this incorrectly fails.
>>>>>
>>>>> If raid0.ko didn't have any alias this would succeed, but it does.
>>>>>
>>>>> $ modinfo -F alias raid0
>>>>> md-level-0
>>>>> md-raid0
>>>>> md-personality-2
>>>>
>>>> Huh? Is the module not loaded?
>>>
>>> No, because the running kernel has "md/raid built in (no modules)".
>>>
>>> Thanks,
>>> NeilBrown
>>>
>>>>
>>>>>
>>>>> However these aliases don't appear in any modalias file in /sys/devices,
>>>>> in /proc/crypto, or in /proc/modules.
>>>>>
>>>>> Maybe you could parse /proc/mdstat..
>>>>>
>>>>> if [ -f /proc/mdstat ]; then
>>>>>   while read _d _c _a _m _x; do
>>>>>    if [ "$_c" = ':' -a "$_a" = 'active' ]; then
>>>>>       host_modalias["md-$_m"]=1
>>>>>    fi
>>>>>   done < /proc/mdstat
>>>>> fi
>>>>>
>>>>> but it all seems rather fragile.  There are probably other modules that
>>>>> might miss out accidentally. dm?
>>>>>
>>>>> Do we really need the host_modalias stuff?
>>>>>
>>>>> Thanks,
>>>>> NeilBrown
>>>>>
>> 
>> Interesting... so we have to blow up the initramfs with the entire drivers/md
>> in the case, where you switch from "compiled in" to "not compiled in"..
>> 
>> I guess that happens not that often, so better be safe than sorry.
>
> remove host_modalias
>
> <https://github.com/haraldh/dracut/commit/07a081f352497258862ae164d11d9e6dc2c5b959>

Thanks a lot for resolving this!

NeilBrown

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