[Bug 1848211]

[Mark J. Wielaard]

commit 8b1961511c93962ea2a9b918af8e9c32e3c24d71
Author: Balint Reczey <balint.reczey at canonical.com>
Date:   Thu Nov 28 13:34:21 2019 +0100

    Don't look for debug alt file in debug image if it is already found
    
    With dwz the .gnu_debuglink section may appear duplicated in the
    debug file referenced originally in the .gnu_debuglink section.
    
    https://bugs.launchpad.net/ubuntu/+source/valgrind/+bug/1848211
    
    https://bugs.kde.org/show_bug.cgi?id=396656
    https://bugs.kde.org/show_bug.cgi?id=427969
    
    Signed-off-by: Balint Reczey <balint.reczey at canonical.com>

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https://bugs.launchpad.net/bugs/1848211

Title:
  [SRU] valgrind fails to use debug symbols from glib/gtk

Status in Valgrind:
  Fix Released
Status in valgrind package in Ubuntu:
  Fix Released
Status in valgrind source package in Bionic:
  Triaged
Status in valgrind source package in Disco:
  Won't Fix
Status in valgrind source package in Eoan:
  Fix Released
Status in valgrind source package in Focal:
  Fix Released
Status in valgrind package in Debian:
  Fix Released

Bug description:
  [Impact]

   * With dwz the .gnu_debuglink section may appear duplicated in the
  debug file referenced originally in the .gnu_debuglink section. In
  that case Valgrind fails to load the debug symbols.

  [Test Case]

   * In Ubuntu releases earlier than 19.10 use gio from a package rebuilt with dwz.
   * Install debug symbols for gio following the guide at https://wiki.ubuntu.com/Debug%20Symbol%20Packages
   * Observe no relevant error when running gio with valgrind:
     $ valgrind /usr/bin/gio ~

  [Regression Potential]

   * The fix is very simple, just ignoring the second .gnu_debuglink
  found. There are no likely regressions.

  [Original Bug Text]

  The debug symbols from libglib2.0-0-dbgsym and libgtk-3-0-dbgsym don't
  get properly picked up by valgrind in eoan for some reason. The
  symbols correctly work under gdb.

  There is an warning printed from valgrind
  'debuginfo section duplicates a section in the main ELF file'

  Laney tried to rebuild without dh_dwz and it makes the warning go away and the symbol work.
  Downgrading valgrind to the disco version doesn't fix the issue.

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