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Subject: Re: [PATCH 5.4 000/191] 5.4.8-stable review
From:   Mike Kravetz <mike.kravetz@oracle.com>
To:     Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Naresh Kamboju <naresh.kamboju@linaro.org>,
        open list <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Shuah Khan <shuah@kernel.org>, patches@kernelci.org,
        Ben Hutchings <ben.hutchings@codethink.co.uk>,
        lkft-triage@lists.linaro.org,
        linux- stable <stable@vger.kernel.org>,
        Chengguang Xu <cgxu519@mykernel.net>,
        David Howells <dhowells@redhat.com>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Sasha Levin <sashal@kernel.org>, LTP List <ltp@lists.linux.it>,
        Jan Stancek <jstancek@redhat.com>,
        John Stultz <john.stultz@linaro.org>
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Date:   Fri, 3 Jan 2020 09:56:52 -0800
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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