linux-kernel - Re: [hugetlbfs] 3a47c54f09: kernel-selftests.vm.run_vmtests.sh../userfaultfd_hugetlb_256

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Message-ID: <Y1LrfJ6ZECI0kniN@monkey>
Date:   Fri, 21 Oct 2022 11:57:00 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     kernel test robot <yujie.liu@...el.com>
Cc:     lkp@...ts.01.org, lkp@...el.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        David Hildenbrand <david@...hat.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        James Houghton <jthoughton@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Michal Hocko <mhocko@...e.com>,
        Mina Almasry <almasrymina@...gle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Peter Xu <peterx@...hat.com>,
        Prakash Sangappa <prakash.sangappa@...cle.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        regressions@...ts.linux.dev
Subject: Re: [hugetlbfs] 3a47c54f09:
 kernel-selftests.vm.run_vmtests.sh../userfaultfd_hugetlb_256_32.fail

On 10/21/22 16:04, kernel test robot wrote:
> Hi Mike,
> 
> We noticed below commit reverts some hugetlb related code in fault path,
> and we happened to catch a "userfaultfd hugetlb" selftests failure on
> this commit. Could you please help check if this is an expected result?
> 
> The commit message mentions about:
> 
> "In subsequent patches, a new synchronization mechanism will be added to
> coordinate pmd sharing and eliminate this race."
> 
> We noticed this failure still exists on the latest mainline head
> e35184f321518 ("Merge tag 'drm-fixes-2022-10-21' of git://anongit.freedesktop.org/drm/drm")
> 
> Please kindly let us know if you'd like us to keep tracking this issue on
> mainline, or please feel free to ignore this report if this issue is not
> that important.

Fixed with commit 2ea7ff1e39cb "mm/hugetlb: fix race condition of uffd
missing/minor handling"
-- 
Mike Kravetz