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From: "amerey at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/29159] New: gdb crashes when libstdc++ debuginfo is present
 but .dwz is missing
Date: Fri, 20 May 2022 00:38:12 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29159

            Bug ID: 29159
           Summary: gdb crashes when libstdc++ debuginfo is present but
                    .dwz is missing
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: amerey at redhat dot com
  Target Milestone: ---

gdb crashes when libstdc++ debuginfo is present but the libstdc++ .dwz file=
 is
missing.

This condition can be triggered by installing the libstdc++ debuginfo packa=
ge
and manually moving the .dwz file so gdb can't find it.  Alternatively, all=
ow
debuginfod to download the libstdc++ debuginfo but cancel the .dwz file
download (press ctrl-c during the download).

Steps to Reproduce:
$ gdb -ex 'run' gdb
[...]
Downloading separate debug info for /lib64/libstdc++.so.6...
Downloading separate debug info for
/home/amerey/.cache/debuginfod_client/36f7946c2608f3e08b11ec0af0b63055a39c8=
9f3/debuginfo...
Cancelling download of separate debug info for
/home/amerey/.cache/debuginfod_client/36f7946c2608f3e08b11ec0af0b63055a39c8=
9f3/debuginfo...
[...]
Starting program: /usr/bin/gdb=20
Error while reading shared library symbols for /lib64/libstdc++.so.6:
could not find '.gnu_debugaltlink' file for
/home/amerey/.cache/debuginfod_client/36f7946c2608f3e08b11ec0af0b63055a39c8=
9f3/debuginfo
[...]
double free or corruption (!prev)

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