linux-kernel - Re: stable-rc 5.4: libhugetlbfs fallocate_stress.sh: Unable to handle kernel paging request at virtual address ffff00006772f000

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Date:   Thu, 14 May 2020 09:31:02 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Michal Hocko <mhocko@...nel.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     linux- stable <stable@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, Hugh Dickins <hughd@...gle.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A.Shutemov" <kirill.shutemov@...ux.intel.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Prakash Sangappa <prakash.sangappa@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        lkft-triage@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
        John Stultz <john.stultz@...aro.org>
Subject: Re: stable-rc 5.4: libhugetlbfs fallocate_stress.sh: Unable to handle
 kernel paging request at virtual address ffff00006772f000

On 5/13/20 11:40 PM, Michal Hocko wrote:
> On Wed 13-05-20 23:11:40, Naresh Kamboju wrote:
>> While running libhugetlbfs fallocate_stress.sh on stable-rc 5.4 branch kernel
>> on arm64 hikey device. The following kernel Internal error: Oops:
>> crash dump noticed.
> 
> Is the same problem reproducible on vanilla 5.4 without any stable
> patches?
> 

Or, an earlier version of 5.4-stable?  Nothing in the changelog for 5.4.41
looks related to this issue.  There was an arm specific hugetlb change
"arm64: hugetlb: avoid potential NULL dereference", but that is pretty
straight forward.

I'm guessing this may not reproduce easily.  To help reproduce, you could
change the
#define FALLOCATE_ITERATIONS 100000
in .../libhugetlbfs/tests/fallocate_stress.c to a larger number to force
the stress test to run longer.
-- 
Mike Kravetz