-----Original Message-----
> On kernels v5.8 or later, makedumpfile fails for memory dumps in the
> sadump-related formats as follows:
>
> # makedumpfile -f -l -d 31 -x ./vmlinux /dev/sdd4 /root/vmcore-ld31
> __vtop4_x86_64: Can't get a valid pud_pte.
> ...110 lines of the same message...
> __vtop4_x86_64: Can't get a valid pud_pte.
> calc_kaslr_offset: failed to calculate kaslr_offset and phys_base; default to 0
> readmem: type_addr: 1, addr:ffffffff85411858, size:8
> __vtop4_x86_64: Can't get pgd (page_dir:ffffffff85411858).
> readmem: Can't convert a virtual address(ffffffff059be980) to physical address.
> readmem: type_addr: 0, addr:ffffffff059be980, size:1024
> cpu_online_mask_init: Can't read cpu_online_mask memory.
>
> makedumpfile Failed.
>
> This is caused by the kernel commit 9d06c4027f21 ("x86/entry: Convert
> Divide Error to IDTENTRY") that renamed divide_error to
> asm_exc_divide_error, breaking logic for calculating kaslr offset.
>
> Fix this by adding initialization of asm_exc_divide_error.
>
> Signed-off-by: HATAYAMA Daisuke <d.hatayama@xxxxxxxxxxx>
> ---
> makedumpfile.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/makedumpfile.c b/makedumpfile.c
> index a51bdaf..7ed9756 100644
> --- a/makedumpfile.c
> +++ b/makedumpfile.c
> @@ -1667,6 +1667,8 @@ get_symbol_info(void)
> SYMBOL_INIT(cur_cpu_spec, "cur_cpu_spec");
>
> SYMBOL_INIT(divide_error, "divide_error");
> + if (SYMBOL(divide_error) == NOT_FOUND_SYMBOL)
> + SYMBOL_INIT(divide_error, "asm_exc_divide_error");
> SYMBOL_INIT(idt_table, "idt_table");
> SYMBOL_INIT(saved_command_line, "saved_command_line");
> SYMBOL_INIT(pti_init, "pti_init");
> --
> 2.31.1
Thanks, applied.
https://github.com/makedumpfile/makedumpfile/commit/59b1726fbcc251155140c8a1972384498fee4daf
Kazu
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