linux-kernel - Re: [PATCH v2] arm64: kdump: Skip kmemleak scan reserved memory for kdump

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Date:   Fri, 10 Sep 2021 18:07:45 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     anshuman.khandual@....com, rppt@...nel.org, nsaenz@...nel.org,
        ardb@...nel.org, kirill.shtuemov@...ux.intel.com,
        linux-kernel@...r.kernel.org, Chen Wandun <chenwandun@...wei.com>,
        linux-arm-kernel@...ts.infradead.org, akpm@...ux-foundation.org,
        rmk+kernel@...linux.org.uk, will@...nel.org,
        wangkefeng.wang@...wei.com, geert+renesas@...der.be,
        mick@....forth.gr
Subject: Re: [PATCH v2] arm64: kdump: Skip kmemleak scan reserved memory for kdump

On Fri, 10 Sep 2021 14:48:44 +0800, Chen Wandun wrote:
> Trying to boot with kdump + kmemleak, command will result in a crash:
> "echo scan > /sys/kernel/debug/kmemleak"
> 
> crashkernel reserved: 0x0000000007c00000 - 0x0000000027c00000 (512 MB)
> Kernel command line: BOOT_IMAGE=(hd1,gpt2)/vmlinuz-5.14.0-rc5-next-20210809+ root=/dev/mapper/ao-root ro rd.lvm.lv=ao/root rd.lvm.lv=ao/swap crashkernel=512M
> Unable to handle kernel paging request at virtual address ffff000007c00000
> Mem abort info:
>   ESR = 0x96000007
>   EC = 0x25: DABT (current EL), IL = 32 bits
>   SET = 0, FnV = 0
>   EA = 0, S1PTW = 0
>   FSC = 0x07: level 3 translation fault
> Data abort info:
>   ISV = 0, ISS = 0x00000007
>   CM = 0, WnR = 0
> swapper pgtable: 64k pages, 48-bit VAs, pgdp=00002024f0d80000
> [ffff000007c00000] pgd=1800205ffffd0003, p4d=1800205ffffd0003, pud=1800205ffffd0003, pmd=1800205ffffc0003, pte=0068000007c00f06
> Internal error: Oops: 96000007 [#1] SMP
> pstate: 804000c9 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> pc : scan_block+0x98/0x230
> lr : scan_block+0x94/0x230
> sp : ffff80008d6cfb70
> x29: ffff80008d6cfb70 x28: 0000000000000000 x27: 0000000000000000
> x26: 00000000000000c0 x25: 0000000000000001 x24: 0000000000000000
> x23: ffffa88a6b18b398 x22: ffff000007c00ff9 x21: ffffa88a6ac7fc40
> x20: ffffa88a6af6a830 x19: ffff000007c00000 x18: 0000000000000000
> x17: 0000000000000000 x16: 0000000000000000 x15: ffffffffffffffff
> x14: ffffffff00000000 x13: ffffffffffffffff x12: 0000000000000020
> x11: 0000000000000000 x10: 0000000001080000 x9 : ffffa88a6951c77c
> x8 : ffffa88a6a893988 x7 : ffff203ff6cfb3c0 x6 : ffffa88a6a52b3c0
> x5 : ffff203ff6cfb3c0 x4 : 0000000000000000 x3 : 0000000000000000
> x2 : 0000000000000001 x1 : ffff20226cb56a40 x0 : 0000000000000000
> Call trace:
>  scan_block+0x98/0x230
>  scan_gray_list+0x120/0x270
>  kmemleak_scan+0x3a0/0x648
>  kmemleak_write+0x3ac/0x4c8
>  full_proxy_write+0x6c/0xa0
>  vfs_write+0xc8/0x2b8
>  ksys_write+0x70/0xf8
>  __arm64_sys_write+0x24/0x30
>  invoke_syscall+0x4c/0x110
>  el0_svc_common+0x9c/0x190
>  do_el0_svc+0x30/0x98
>  el0_svc+0x28/0xd8
>  el0t_64_sync_handler+0x90/0xb8
>  el0t_64_sync+0x180/0x184
> 
> [...]

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

[1/1] arm64: kdump: Skip kmemleak scan reserved memory for kdump
      https://git.kernel.org/arm64/c/85f58eb18898

-- 
Catalin