From: Baolu Lu <baolu.lu@linux.intel.com>
To: Dave Hansen <dave.hansen@intel.com>,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Kevin Tian <kevin.tian@intel.com>,
Jason Gunthorpe <jgg@nvidia.com>, Jann Horn <jannh@google.com>,
Vasant Hegde <vasant.hegde@amd.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Alistair Popple <apopple@nvidia.com>,
Peter Zijlstra <peterz@infradead.org>,
Uladzislau Rezki <urezki@gmail.com>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
Andy Lutomirski <luto@kernel.org>, Yi Lai <yi1.lai@intel.com>,
David Hildenbrand <david@redhat.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
"Liam R . Howlett" <Liam.Howlett@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>, Mike Rapoport <rppt@kernel.org>,
Michal Hocko <mhocko@kernel.org>,
Matthew Wilcox <willy@infradead.org>
Cc: iommu@lists.linux.dev, security@kernel.org, x86@kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Dave Hansen <dave.hansen@linux.intel.com>
Subject: Re: [PATCH v6 3/7] x86/mm: Use 'ptdesc' when freeing PMD pages
Date: Wed, 15 Oct 2025 13:19:44 +0800 [thread overview]
Message-ID: <bf6ee535-cd5c-41ed-b0a0-f2dc10c1382d@linux.intel.com> (raw)
In-Reply-To: <b6fdba02-cc3e-4d06-b013-fba94209e7a1@intel.com>
On 10/15/25 07:19, Dave Hansen wrote:
> On 10/14/25 06:04, Lu Baolu wrote:
>> -#if defined(CONFIG_SPLIT_PMD_PTLOCKS)
>> -
>> +#if defined(CONFIG_SPLIT_PMD_PTLOCKS) || defined(CONFIG_X86_64)
>
> What's with the #ifdef munging? It's not mentioned in the changelog.
>
> I went looking at this because pmd_free_pte_page() is right in the
> middle of the action on this reported use after free:
>
>> https://lore.kernel.org/all/68eeb99e.050a0220.91a22.0220.GAE@google.com/
>
> so something fishy is going on. It would be great to narrow that report
> down to a _specific_ patch in the series.
Yes. I am trying to reproduce the issue on my local machine and then
narrow down the reported issue.
Thanks,
baolu
next prev parent reply other threads:[~2025-10-15 5:23 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-14 13:04 [PATCH v6 0/7] Fix stale IOTLB entries for kernel address space Lu Baolu
2025-10-14 13:04 ` [PATCH v6 1/7] mm: Add a ptdesc flag to mark kernel page tables Lu Baolu
2025-10-16 19:26 ` David Hildenbrand
2025-10-14 13:04 ` [PATCH v6 2/7] mm: Actually mark kernel page table pages Lu Baolu
2025-10-14 13:04 ` [PATCH v6 3/7] x86/mm: Use 'ptdesc' when freeing PMD pages Lu Baolu
2025-10-14 23:19 ` Dave Hansen
2025-10-15 5:19 ` Baolu Lu [this message]
2025-10-16 19:33 ` David Hildenbrand
2025-10-14 13:04 ` [PATCH v6 4/7] mm: Introduce pure page table freeing function Lu Baolu
2025-10-14 13:04 ` [PATCH v6 5/7] x86/mm: Use pagetable_free() Lu Baolu
2025-10-14 13:04 ` [PATCH v6 6/7] mm: Introduce deferred freeing for kernel page tables Lu Baolu
2025-10-16 19:35 ` David Hildenbrand
2025-10-17 1:29 ` Baolu Lu
2025-10-14 13:04 ` [PATCH v6 7/7] iommu/sva: Invalidate stale IOTLB entries for kernel address space Lu Baolu
2025-10-14 20:59 ` [syzbot ci] Re: Fix " syzbot ci
2025-10-15 16:25 ` Dave Hansen
2025-10-16 8:00 ` Baolu Lu
2025-10-17 17:05 ` Dave Hansen
2025-10-17 17:10 ` David Hildenbrand
2025-10-20 5:34 ` Baolu Lu
2025-10-20 14:26 ` David Hildenbrand
2025-10-15 0:43 ` [PATCH v6 0/7] " Andrew Morton
2025-10-15 5:38 ` Baolu Lu
2025-10-15 15:55 ` Dave Hansen
2025-10-17 1:42 ` Baolu Lu
2025-10-17 14:01 ` Jason Gunthorpe
2025-10-17 17:28 ` Dave Hansen
2025-10-17 17:31 ` Dave Hansen
2025-10-17 17:54 ` Jason Gunthorpe
2025-10-17 18:26 ` Vinicius Costa Gomes
2025-10-22 5:06 ` Baolu Lu
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