Re: mark_object crash in 22.1 and latest CVS (as of tonight)

[Richard Stallman]

    Adding a subcase of Lisp_Misc_Free inside the
    (in mark_object) which calls break (i.e. ignores it) causes my crash
    to go away.

Lisp_Misc_Free should only be found in objects on the free list.
To have a pointer to such an object inside a live Lisp object
indicates a bug.  The code in mark_object does the right thing
when it detects such a bug: it calls abort.

    Since I have a reproducible test case I'd be happy to track down
    where these are coming from, but I need some help (in the form
    of information) to know what I'm chasing.

Thanks -- this is exactly what is needed for this bug.

The first questions are, what object contains the bad pointer?
What data type is it?  What data structure is it part of?

Once you answer those, you can try to figure out how it happened
that the data structure ended up with a bad pointer.
Maybe GC failed to mark that pointer, so the misc object got freed
even though it was still in use.


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Date: Thu, 8 Nov 2007 22:55:46 -0500
From: "Kalman Reti" <address@hidden>
To: address@hidden
MIME-Version: 1.0
Content-Type: multipart/mixed; 
        boundary="----=_Part_6215_19104712.1194580546565"
Subject: mark_object crash in 22.1 and latest CVS (as of tonight)

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See attached file for gdb session of garbage collector crash in
a [GNU/]linux emacs built from sources checked out tonight.

  Kalman

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