From: Matt Corallo <kernel@bluematt.me>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
bugzilla-daemon@bugzilla.kernel.org,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [Bug 202149] New: NULL Pointer Dereference in __split_huge_pmd on PPC64LE
Date: Wed, 9 Jan 2019 08:38:28 -0500 [thread overview]
Message-ID: <A61367CF-277E-4E74-8A9D-C94C5E53817B@bluematt.me> (raw)
In-Reply-To: <8736q2jbhr.fsf@linux.ibm.com>
It's normal daily usage on a workstation (TALOS 2). I've seen it at least twice, both times in rustc, though I've run rustc more times than I can count. Note that the program that triggered it was running in lxc and it only happened after upgrading to 4.19.
> On Jan 9, 2019, at 06:50, Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> wrote:
>
> Matt Corallo <kernel@bluematt.me> writes:
>
>> .config follows. I have not tested with 64K pages as, sadly, I have a
>> large BTRFS volume that was formatted on x86, and am thus stuck with 4K
>> pages. Note that this is roughly the Debian kernel, so it has whatever
>> patches Debian defaults to applying, a list of which follows.
>>
>
> What is the test you are running? I tried a 4K page size config on P9. I
> am running ltp test suite there. Also tried few thp memremap tests.
> Nothing hit that.
>
> root@:~/tests/ltp/testcases/kernel/mem/thp# getconf PAGESIZE
> 4096
> root@ltc-boston123:~/tests/ltp/testcases/kernel/mem/thp# grep thp /proc/vmstat
> thp_fault_alloc 641141
> thp_fault_fallback 0
> thp_collapse_alloc 90
> thp_collapse_alloc_failed 0
> thp_file_alloc 0
> thp_file_mapped 0
> thp_split_page 1
> thp_split_page_failed 0
> thp_deferred_split_page 641150
> thp_split_pmd 24
> thp_zero_page_alloc 1
> thp_zero_page_alloc_failed 0
> thp_swpout 0
> thp_swpout_fallback 0
> root@:~/tests/ltp/testcases/kernel/mem/thp#
>
> -aneesh
>
next prev parent reply other threads:[~2019-01-09 13:46 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-202149-27@https.bugzilla.kernel.org/>
2019-01-05 1:04 ` [Bug 202149] New: NULL Pointer Dereference in __split_huge_pmd on PPC64LE Andrew Morton
2019-01-08 7:15 ` Aneesh Kumar K.V
2019-01-08 19:17 ` Matt Corallo
2019-01-09 11:50 ` Aneesh Kumar K.V
2019-01-09 13:38 ` Matt Corallo [this message]
2019-01-21 12:35 ` Aneesh Kumar K.V
2019-02-14 20:17 ` Matt Corallo
2019-02-15 3:58 ` Michael Ellerman
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