[Bug gdb/29159] New: gdb crashes when libstdc++ debuginfo is present but .dwz is missing

[Bug gdb/29159] New: gdb crashes when libstdc++ debuginfo is present but .dwz is missing

[amerey at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29159

            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 package
and manually moving the .dwz file so gdb can't find it.  Alternatively, allow
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/36f7946c2608f3e08b11ec0af0b63055a39c89f3/debuginfo...
Cancelling download of separate debug info for
/home/amerey/.cache/debuginfod_client/36f7946c2608f3e08b11ec0af0b63055a39c89f3/debuginfo...
[...]
Starting program: /usr/bin/gdb 
Error while reading shared library symbols for /lib64/libstdc++.so.6:
could not find '.gnu_debugaltlink' file for
/home/amerey/.cache/debuginfod_client/36f7946c2608f3e08b11ec0af0b63055a39c89f3/debuginfo
[...]
double free or corruption (!prev)

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[Bug gdb/29159] gdb crashes when libstdc++ debuginfo is present but .dwz is missing

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29159

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at sourceware dot org

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
Not sure I am reproducing this correctly, but if I rename

$ sudo mv /usr/lib/debug/.dwz/gcc-13.2.1-7.fc38.x86_64{,-xyz}


then gdb just rejects the symbol-file, which also seems unfortunate.

warning: could not find '.gnu_debugaltlink' file for
/usr/lib/debug/usr/bin/gcc-13.2.1-7.fc38.x86_64.debug
(gdb) start
could not read '.gnu_debugaltlink' section


I couldn't interrupt debuginfod quickly enough for that approach
to work.

Is this really a 'dwz' issue or just a separate debug issue?
That wasn't clear to me from the bug.

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