[Bug c++/28605] New: internal-error: Should not be able to create a lazy value with an enclosing type

[Bug c++/28605] New: internal-error: Should not be able to create a lazy value with an enclosing type

[nrw at yandex dot ru]

https://sourceware.org/bugzilla/show_bug.cgi?id=28605

            Bug ID: 28605
           Summary: internal-error: Should not be able to create a lazy
                    value with an enclosing type
           Product: gdb
           Version: 11.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: nrw at yandex dot ru
  Target Milestone: ---

Crash in gdb/dwarf2/loc.c:1730: internal-error: Should not be able to create a
lazy value with an enclosing type

It's happens randomly during debug under QtCreator Linux Mangaro XFCE.
Full text from QtCreator debugger log:
>&"python theDumper.fetchVariables({\"autoderef\":1,\"context\":\"\",\"displaystringlimit\":300,\"dyntype\":1,\"expanded\":[\"watch\",\"return\",\"local\",\"inspect\"],\"fancy\":1,\"formats\":{},\"nativemixed\":0,\"partialvar\":\"\",\"passexceptions\":0,\"qobjectnames\":1,\"resultvarname\":\"\",\"stringcutoff\":10000,\"timestamps\":0,\"token\":37,\"typeformats\":{},\"watchers\":[]})\n"
>~"../../gdb/dwarf2/loc.c:1730: internal-error: Should not be able to create a lazy value with an enclosing type\nA problem internal to GDB has been detected,\nfurther debugging may prove unreliable."

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[Bug c++/28605] internal-error: Should not be able to create a lazy value with an enclosing type

[nrw at yandex dot ru]

https://sourceware.org/bugzilla/show_bug.cgi?id=28605

--- Comment #1 from Roman Nikulenkov <nrw at yandex dot ru> ---
on the same code version 10.2 works without any issues

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[Bug c++/28605] internal-error: Should not be able to create a lazy value with an enclosing type

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28605

Tom Tromey <tromey at sourceware dot org> changed:

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

--- Comment #2 from Tom Tromey <tromey at sourceware dot org> ---
I think we'd need more information to try to fix this bug.
One thing that might be useful is a stack trace showing
the path taken by gdb to the error.

The very best thing would be a small C++ test case and a sequence
of commands that can be used to reproduce the crash.  (I realize
this is probably hard though)

I somewhat suspect that the assertion is in error, as the code
says:

  if (from != nullptr)
    {
      from_contents = value_contents (from).data ();
      v_contents = nullptr;
    }
  else
    {
      if (value_type (v) != value_enclosing_type (v))
        internal_error (__FILE__, __LINE__,
                        _("Should not be able to create a lazy value with "
                          "an enclosing type"));

... but when I look at this I don't see anything that's obviously
checking for a lazy value.

However, looking at the most recent patch in this area, I see the
assertion goes back a ways.  So I'm not certain that the check
is wrong, and I wonder what really changed.

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[Bug c++/28605] internal-error: Should not be able to create a lazy value with an enclosing type

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28605

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-04-02
             Status|UNCONFIRMED                 |WAITING

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[Bug c++/28605] internal-error: Should not be able to create a lazy value with an enclosing type

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28605

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW

--- Comment #3 from Tom Tromey <tromey at sourceware dot org> ---
See https://sourceware.org/pipermail/gdb-patches/2022-October/192547.html
There are other threads in earlier months as well.

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[Bug c++/28605] internal-error: Should not be able to create a lazy value with an enclosing type

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28605

--- Comment #4 from Tom Tromey <tromey at sourceware dot org> ---
That patch landed but I tend to think we should clear the
enclosing type when modifying a value's type.

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