On Tue, Nov 26, 2019 at 1:04 PM Prabhakar Kushwaha
<[email protected]> wrote:
>
> Hi All,
>
> I am facing issue below error with latest kexec-tools/vmcore-demsg tools.
>
> $ ./build/sbin/vmcore-dmesg /proc/vmcore
> No program header covering vaddr 0xffff000be7a00000found kexec bug?
>
> I am testing on AARM64 platform with following git repos.
> A) kexec tools:
> https://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git
> top commit: bd077966e2b9041c (kexec-tools: Fix conversion overflow
> when compiling on 32-bit platforms)
>
> B) Linux:git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> top commit: af42d3466bdc8f3980 (Linux 5.4-rc8)
>
> I am seeing similar issue in past also in couple of discussions. has
> it not fixed earlier or it keep arises with time to time
>
I did further analysis and with below changes kexec-tools/vmcore-demsg
working fine
diff --git a/kexec/arch/arm64/crashdump-arm64.c
b/kexec/arch/arm64/crashdump-arm64.c
index 4fd7aa8..1c28b06 100644
--- a/kexec/arch/arm64/crashdump-arm64.c
+++ b/kexec/arch/arm64/crashdump-arm64.c
@@ -58,6 +58,8 @@ static uint64_t get_kernel_page_offset(void)
{
int i;
+ return 0xffff000000000000;
if (elf_info.kern_vaddr_start == UINT64_MAX)
return UINT64_MAX;
After patch 14c127c957c1 ("arm64: mm: Flip kernel VA space") in Linux,
the PAGE_OFFSET address has been moved to bottom instead of middle in
kernel virtual address space. looks like existing code still assumes
PAGE_OFFSET in middle.
A proper fix is required. Let me work on this.
--pk
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