Re: [PATCH 5.4 000/191] 5.4.8-stable review

Mike Kravetz
2020-01-03T17:59:53Z

On 1/3/20 9:33 AM, Mike Kravetz wrote:
> On 1/3/20 7:56 AM, Arnd Bergmann wrote:
>> On Fri, Jan 3, 2020 at 4:45 PM Greg Kroah-Hartman
>> <gregkh@linuxfoundation.org> wrote:
>>> On Fri, Jan 03, 2020 at 04:29:56PM +0100, Arnd Bergmann wrote:
>>>> On Fri, Jan 3, 2020 at 4:25 PM Arnd Bergmann <arnd@arndb.de> wrote:
>>>>>
>>>>> On Fri, Jan 3, 2020 at 4:03 PM Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
>>>>>>
>>>>>> On Fri, 3 Jan 2020 at 03:42, Greg Kroah-Hartman
>>>>>> <gregkh@linuxfoundation.org> wrote:
>>>>>
>>>>> -ENOENT is what you get when hugetlbfs is not mounted, so this hints to
>>>>>
>>>>> 8fc312b32b2 mm/hugetlbfs: fix error handling when setting up mounts
>>>>>
>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?h=linux-5.4.y&id=3f549fb42a39bea3b29c0fc12afee53c4a01bec9
>>>>
>>>> I see that Mike Kravetz suggested not putting this patch into stable in
>>>>
>>>> https://lore.kernel.org/lkml/befca227-cb8a-8f47-617d-e3bf9972bfec@oracle.com/
>>>>
>>>> but it was picked through the autosel mechanism later.
>>>
>>> So does that mean that Linus's tree shows this LTP failure as well?
>>
>> Yes, according to
>> https://qa-reports.linaro.org/lkft/linux-mainline-oe/tests/ltp-syscalls-tests/memfd_create04
>> mainline has the same testcase failure, it started happening between
>> v5.4-10135-gc3bfc5dd73c6 and v5.4-10271-g596cf45cbf6e, when the patch
>> was originally merged into 5.5-rc1.
>>
>>> This does seem to fix a real issue, as shown by the LTP test noticing
>>> it, so should the error code value be fixed in Linus's tree?
>>
>> No idea what to conclude from the testcase failure, let's see if Mike has
>> any suggestions.
>>
>
> Thanks for isolating to this patch!
>
> There are dependencies between arch specific code and arch independent code
> during the setup of hugetlb sizes/mounts. Let me take a closer look at the
> arm64 code and get access to a system for debug.

Before I started investigating, Jan Stancek found and fixed the issue.

http://lkml.kernel.org/r/a14b944b6e5e207d2f84f43227c98ed1f68290a2.1578072927.git.jstancek@redhat.com

--
Mike Kravetz