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

From: Catalin Marinas
Date: Fri Sep 10 2021 - 13:08:01 EST


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