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Re: Nasty GC bug

From: Paul Eggert
Subject: Re: Nasty GC bug
Date: Fri, 24 Aug 2012 01:56:17 -0700
User-agent: Mozilla/5.0 (X11; Linux i686; rv:14.0) Gecko/20120714 Thunderbird/14.0

On 08/24/2012 12:26 AM, Dmitry Antipov wrote:
> Suggested fix is to use MEM_TYPE_NON_LISP for spare memory, e.g.:

Thanks for finding this bug.

That patch doesn't look quite right if ! USE_LSB_TAG, since
in that case lisp_align_malloc won't correctly report a
failure in the section of code that checks whether the
memory just allocated can be addressed through a Lisp
object's pointer.  Also, what about dont_register_blocks
and allocated_mem_type?

Instead, how about marking the spare conses with Vdead
and the spare strings with NULL data?  Admittedly I
haven't had time to think this through....

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