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From: "panxh_ran at 163 dot com" <sourceware-bugzilla@sourceware.org>
To: elfutils-devel@sourceware.org
Subject: [Bug tools/29282] New: eu-addr2line -k doesn't display correct
 file:line in arm.
Date: Fri, 24 Jun 2022 00:16:49 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29282

            Bug ID: 29282
           Summary: eu-addr2line -k doesn't display correct file:line in
                    arm.
           Product: elfutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tools
          Assignee: unassigned at sourceware dot org
          Reporter: panxh_ran at 163 dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

Hello, when using eu-addr2line -k to get line infomation of kernel symbols,=
 it
often displays wrong file:line in arm.
Steps=EF=BC=9A
1.Get func address from /proc/kallsyms.
2.Use eu-addr2line -k <address> to get file name and line number.
Compare the line number with source file=EF=BC=8Cand we find the line numbe=
r is wrong.

It seems that the following kernel commit that adds NOPs at function entry
causes the problem.
Elfutils needs to adapt this feature.
> Fixes: 3b23e4991fb6 ("arm64: implement ftrace with regs")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

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