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

[Paul Eggert]

On 5/25/20 8:33 PM, Paul Eggert 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?

Oh, never mind, I figured it out. Sorry about the noise.

I installed the first attached patch to fix the bug on master (as a series of
commits, the leading ones not quite right unfortunately). This patch does what
you proposed, and also tightens up some of the related alignment checks.

I propose the second patch for emacs-27; it's limited to what you proposed,
namely, it weakens maybe_lisp_pointer to check only for GC_ALIGNMENT.

emacs.diff
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0001-Fix-aborts-due-to-GC-losing-pseudovectors.patch
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