linux-kernel - Re: [PATCH v3] arm64/mm: fix incorrect file_map

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Message-Id: <167293109023.1463092.17340880121149597305.b4-ty@kernel.org>
Date:   Thu,  5 Jan 2023 18:03:59 +0000
From:   Will Deacon <will@...nel.org>
To:     Liu Shixin <liushixin2@...wei.com>,
        Rafael Aquini <raquini@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        David Hildenbrand <dhildenb@...hat.com>
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3] arm64/mm: fix incorrect file_map_count for invalid pmd

On Mon, 21 Nov 2022 15:36:08 +0800, Liu Shixin wrote:
> The page table check trigger BUG_ON() unexpectedly when split hugepage:
> 
>  ------------[ cut here ]------------
>  kernel BUG at mm/page_table_check.c:119!
>  Internal error: Oops - BUG: 00000000f2000800 [#1] SMP
>  Dumping ftrace buffer:
>     (ftrace buffer empty)
>  Modules linked in:
>  CPU: 7 PID: 210 Comm: transhuge-stres Not tainted 6.1.0-rc3+ #748
>  Hardware name: linux,dummy-virt (DT)
>  pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
>  pc : page_table_check_set.isra.0+0x398/0x468
>  lr : page_table_check_set.isra.0+0x1c0/0x468
> [...]
>  Call trace:
>   page_table_check_set.isra.0+0x398/0x468
>   __page_table_check_pte_set+0x160/0x1c0
>   __split_huge_pmd_locked+0x900/0x1648
>   __split_huge_pmd+0x28c/0x3b8
>   unmap_page_range+0x428/0x858
>   unmap_single_vma+0xf4/0x1c8
>   zap_page_range+0x2b0/0x410
>   madvise_vma_behavior+0xc44/0xe78
>   do_madvise+0x280/0x698
>   __arm64_sys_madvise+0x90/0xe8
>   invoke_syscall.constprop.0+0xdc/0x1d8
>   do_el0_svc+0xf4/0x3f8
>   el0_svc+0x58/0x120
>   el0t_64_sync_handler+0xb8/0xc0
>   el0t_64_sync+0x19c/0x1a0
> [...]
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64/mm: fix incorrect file_map_count for invalid pmd
      https://git.kernel.org/arm64/c/74c2f8105451

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev