bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects

[Pip Cet]

On Tue, May 26, 2020 at 3:33 AM Paul Eggert <eggert@cs.ucla.edu> wrote:
> On 5/25/20 4:28 AM, Pip Cet wrote:
>
> > And I just noticed strings aren't aligned to LISP_ALIGNMENT on
> > x86_64-pc-linux-gnu.
>
> Could you explain? Strings are allocated via allocate_string -> lisp_malloc ->
> lmalloc, and lmalloc is supposed to align to LISP_ALIGNMENT for strings just
> like it does for other Lisp objects.

Sorry. You're right, the non-aligned strings aren't relevant for GC.

However, this is only because struct Lisp_String happens to have an
even number of words. If someone changes that, the old code would
break...

We're still going to have to deal with symbols on --wide-int builds
when the two halves of the wide int are saved non-consecutively.