[Bug tools/29282] New: eu-addr2line -k doesn't display correct file:line in arm.

[Bug tools/29282] New: eu-addr2line -k doesn't display correct file:line in arm.

[panxh_ran at 163 dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29282

            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：
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，and we find the line number 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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[Bug tools/29282] eu-addr2line -k doesn't display correct file:line in arm.

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29282

Frank Ch. Eigler <fche at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fche at redhat dot com

--- Comment #1 from Frank Ch. Eigler <fche at redhat dot com> ---
possibly another side-effect of this upstream gcc bug:
https://bugzilla.redhat.com/show_bug.cgi?id=2092438

and not an elfutils bug per se

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[Bug tools/29282] eu-addr2line -k doesn't display correct file:line in arm.

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29282

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=103525
                 CC|                            |mark at klomp dot org

--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
Which seems to be the following gcc bug:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103525

panxiaohe is your kernel build with CONFIG_DYNAMIC_FTRACE=y ? which uses
-fpatchable-function-entry ?

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