From: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: "linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>,
Anshuman Khandual <anshuman.khandual@arm.com>,
linux-mm@kvack.org, Vineet Gupta <vgupta@synopsys.com>,
akpm@linux-foundation.org,
"linux-snps-arc@lists.infradead.org"
<linux-snps-arc@lists.infradead.org>,
linuxppc-dev@lists.ozlabs.org,
linux-riscv <linux-riscv@lists.infradead.org>,
Gerald Schaefer <gerald.schaefer@de.ibm.com>
Subject: Re: [PATCH v4 00/13] mm/debug_vm_pgtable fixes
Date: Wed, 9 Sep 2020 13:16:38 +0200 [thread overview]
Message-ID: <20200909131638.4a95e806@thinkpad> (raw)
In-Reply-To: <87wo134h3s.fsf@linux.ibm.com>
On Wed, 09 Sep 2020 11:38:39 +0530
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> wrote:
> Gerald Schaefer <gerald.schaefer@linux.ibm.com> writes:
>
> > On Fri, 4 Sep 2020 18:01:15 +0200
> > Gerald Schaefer <gerald.schaefer@linux.ibm.com> wrote:
> >
> > [...]
> >>
> >> BTW2, a quick test with this change (so far) made the issues on s390
> >> go away:
> >>
> >> @@ -1069,7 +1074,7 @@ static int __init debug_vm_pgtable(void)
> >> spin_unlock(ptl);
> >>
> >> #ifndef CONFIG_PPC_BOOK3S_64
> >> - hugetlb_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot);
> >> + hugetlb_advanced_tests(mm, vma, (pte_t *) pmdp, pmd_aligned, vaddr, prot);
> >> #endif
> >>
> >> spin_lock(&mm->page_table_lock);
> >>
> >> That would more match the "pte_t pointer" usage for hugetlb code,
> >> i.e. just cast a pmd_t pointer to it. Also changed to pmd_aligned,
> >> but I think the root cause is the pte_t pointer.
> >>
> >> Not entirely sure though if that would really be the correct fix.
> >> I somehow lost whatever little track I had about what these tests
> >> really want to check, and if that would still be valid with that
> >> change.
> >
> > Uh oh, wasn't aware that this (or some predecessor) already went
> > upstream, and broke our debug kernel today.
>
> Not sure i followed the above. Are you finding that s390 kernel crash
> after this patch series or the original patchset? As noted in my patch
> the hugetlb test is broken and we should fix that. A quick fix is to
> comment out that test for s390 too as i have done for PPC64.
We see it with both, it basically is broken since there is a hugetlb
test using real pte pointers. It doesn't always show, depending on
random vaddr, so it slipped through earlier testing.
I guess we also would have had one or the other chance to notice
that earlier, through better review, or better reading of previous
mails. I must admit that I neglected this a bit.
next prev parent reply other threads:[~2020-09-09 11:19 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-02 11:42 [PATCH v4 00/13] mm/debug_vm_pgtable fixes Aneesh Kumar K.V
2020-09-02 11:42 ` [PATCH v4 01/13] powerpc/mm: Add DEBUG_VM WARN for pmd_clear Aneesh Kumar K.V
2020-09-02 11:42 ` [PATCH v4 02/13] powerpc/mm: Move setting pte specific flags to pfn_pte Aneesh Kumar K.V
2020-09-02 12:30 ` Christophe Leroy
2020-09-02 11:42 ` [PATCH v4 03/13] mm/debug_vm_pgtable/ppc64: Avoid setting top bits in radom value Aneesh Kumar K.V
2020-09-04 4:03 ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 04/13] mm/debug_vm_pgtables/hugevmap: Use the arch helper to identify huge vmap support Aneesh Kumar K.V
2020-09-02 12:40 ` Christophe Leroy
2020-09-02 12:53 ` Aneesh Kumar K.V
2020-09-04 4:08 ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 05/13] mm/debug_vm_pgtable/savedwrite: Enable savedwrite test with CONFIG_NUMA_BALANCING Aneesh Kumar K.V
2020-09-04 4:09 ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 06/13] mm/debug_vm_pgtable/THP: Mark the pte entry huge before using set_pmd/pud_at Aneesh Kumar K.V
2020-09-04 5:21 ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 07/13] mm/debug_vm_pgtable/set_pte/pmd/pud: Don't use set_*_at to update an existing pte entry Aneesh Kumar K.V
2020-09-04 5:34 ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 08/13] mm/debug_vm_pgtable/locks: Move non page table modifying test together Aneesh Kumar K.V
2020-09-04 3:58 ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 09/13] mm/debug_vm_pgtable/locks: Take correct page table lock Aneesh Kumar K.V
2020-09-04 5:39 ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 10/13] mm/debug_vm_pgtable/thp: Use page table depost/withdraw with THP Aneesh Kumar K.V
2020-09-04 4:21 ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 11/13] mm/debug_vm_pgtable/pmd_clear: Don't use pmd/pud_clear on pte entries Aneesh Kumar K.V
2020-09-04 6:03 ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 12/13] mm/debug_vm_pgtable/hugetlb: Disable hugetlb test on ppc64 Aneesh Kumar K.V
2020-09-04 6:19 ` Anshuman Khandual
2020-09-02 11:42 ` [PATCH v4 13/13] mm/debug_vm_pgtable: Avoid none pte in pte_clear_test Aneesh Kumar K.V
2020-09-11 2:13 ` Nathan Chancellor
2020-09-11 5:21 ` Aneesh Kumar K.V
2020-09-23 3:14 ` Anshuman Khandual
2020-10-11 20:02 ` Guenter Roeck
2020-10-12 4:29 ` Aneesh Kumar K.V
2020-09-02 11:46 ` Aneesh Kumar K.V
2020-09-04 4:16 ` Anshuman Khandual
2020-09-04 6:48 ` [PATCH v4 00/13] mm/debug_vm_pgtable fixes Anshuman Khandual
2020-09-04 15:26 ` Gerald Schaefer
2020-09-04 16:01 ` Gerald Schaefer
2020-09-04 17:53 ` Gerald Schaefer
2020-09-09 8:38 ` Anshuman Khandual
2020-09-08 15:39 ` Gerald Schaefer
2020-09-09 6:08 ` Aneesh Kumar K.V
2020-09-09 11:16 ` Gerald Schaefer [this message]
2020-09-09 8:15 ` Anshuman Khandual
2020-09-09 11:10 ` Gerald Schaefer
2020-09-09 8:08 ` Anshuman Khandual
2020-09-09 11:36 ` Gerald Schaefer
2020-09-13 11:03 ` [PATCH] mm/debug_vm_pgtable: Avoid doing memory allocation with pgtable_t mapped Aneesh Kumar K.V
2020-09-13 13:42 ` Matthew Wilcox
2020-10-13 20:58 ` [PATCH v4 00/13] mm/debug_vm_pgtable fixes Andrew Morton
2020-10-14 3:15 ` Aneesh Kumar K.V
2020-10-14 20:36 ` Andrew Morton
2020-10-15 2:59 ` Anshuman Khandual
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