[elrepo] EL7 kernel abi changes?

[Phil Perry]

On 03/03/17 16:16, Orion Poplawski wrote:
> On 03/03/2017 09:03 AM, Orion Poplawski wrote:
>> Looks like perhaps some ABI changes with 3.10.0-514.10.2.el7?
>>
>> depmod: WARNING:
>> /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/nvidia-340xx/nvidia-uvm.ko
>> needs unknown symbol nvUvmInterfaceChannelDestroy
>> ...
>>
>> and so on.
>>
>> I tried to see what symbols changed, but none of them are explicitly requires
>> by the kmod-nvidia package.  But maybe some are missing.
>> 1c1
>> < kernel = 3.10.0-514.10.2.el7
>> ---
>>> kernel = 3.10.0-514.6.2.el7
>> 749c749
>> < kernel(acpi_bus_get_device) = 0x03d75282
>> ---
>>> kernel(acpi_bus_get_device) = 0x459997bb
>> 755c755
>> < kernel(acpi_bus_register_driver) = 0x611af3b7
>> ---
>>> kernel(acpi_bus_register_driver) = 0x0fd3fb0d
>> 758,759c758,759
>> < kernel(acpi_bus_trim) = 0x64cf5a8d
>> < kernel(acpi_bus_unregister_driver) = 0xa0b23612
>> ---
>>> kernel(acpi_bus_trim) = 0x597d42de
>>> kernel(acpi_bus_unregister_driver) = 0xf628513f
>
> These seem to be the culprits:
>
> Module nvidia.ko from kernel 3.10.0-514.el7.x86_64 is not compatible   with
> kernel 3.10.0-514.10.2.el7.x86_64 in symbols: acpi_bus_register_driver
> acpi_bus_get_device acpi_bus_unregister_driver
>

Yes, there were a series of ACPI patches in the latest kernel and I 
think you are right, the ABI looks to have changed and that is causing 
the breakage in nvidia.ko

The only way to fix this is to rebuild the nvidia driver against the 
latest kernel (3.10.0-514.10.2.el7.x86_64), but that will break backward 
compatibility with earlier kernels.

This doesn't occur often, but when it does this is the only way to fix.

I'll rebuild the affected nvidia packages this weekend, and add a 
Requires for the latest kernel.

In the meantime, those needing nvidia support will need to revert to 
booting the previous kernel until updated packages are released.

Apologies for the inconvenience, and thank you for your analysis.

Phil