From: Prabhakar Kushwaha <prabhakar.pkin@gmail.com>
To: kexec mailing list <kexec@lists.infradead.org>,
Ganapatrao Prabhakerrao Kulkarni <gkulkarni@marvell.com>,
Prabhakar Kushwaha <pkushwaha@marvell.com>
Subject: Re: kexec-tools/vmcore-demsg: No program header covering vaddr 0xffff000be7a00000found kexec bug?
Date: Tue, 26 Nov 2019 19:31:59 +0530 [thread overview]
Message-ID: <CAJ2QiJ+RhQ_XjTZ_qEkx1Wuf44oSZe1sGj2poLfk5XvbU-JX+A@mail.gmail.com> (raw)
In-Reply-To: <CAJ2QiJLBcmdVrmJmfKehadUzzUkmMsn8b2BxmGh7LHXzo7PtJw@mail.gmail.com>
On Tue, Nov 26, 2019 at 1:04 PM Prabhakar Kushwaha
<prabhakar.pkin@gmail.com> 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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next prev parent reply other threads:[~2019-11-26 14:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-26 7:34 kexec-tools/vmcore-demsg: No program header covering vaddr 0xffff000be7a00000found kexec bug? Prabhakar Kushwaha
2019-11-26 14:01 ` Prabhakar Kushwaha [this message]
2019-11-26 21:11 ` Bhupesh Sharma
2019-11-27 4:50 ` Prabhakar Kushwaha
2019-11-27 20:43 ` Bhupesh Sharma
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