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* MPS: assertion failed: header_type (h) != IGC_OBJ_FWD
@ 2024-07-14  4:12 Gerd Möllmann
  2024-07-14  5:30 ` Pip Cet
  0 siblings, 1 reply; 27+ messages in thread
From: Gerd Möllmann @ 2024-07-14  4:12 UTC (permalink / raw)
  To: Emacs Devel; +Cc: Pip Cet, Helmut Eller

I'm seeing this assertion sometimes in an Emacs built with
--enable-checking=igc_debug,igc_check_fwd,w here sometines means it can
take days of using/running Emacs, or it can take a couple of hours.
This is macOS 14, arm64. I'm linking with -lmps-debug.

The assertion means that we likely have a reference somewhere that
isn't traced. Because it isn't traced, the reference isn't changed to
point to the new location when the object being references is copied
to a new address in memory. Instead, it points to kind of a tombstone
that is left behind when the object is moved.

Alas, I haven't been able to debug this. One problem is that I
can't reproduce it easily, the other is that is is either not
happening or happening much less often when building with -O0, and
without -O0 I can't see much here.

This is just to let people know of the problem. If you find a recipe
how to reproduce this, please let me know. Or better yet, debug it :-).



^ permalink raw reply	[flat|nested] 27+ messages in thread

end of thread, other threads:[~2024-07-23  3:31 UTC | newest]

Thread overview: 27+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-07-14  4:12 MPS: assertion failed: header_type (h) != IGC_OBJ_FWD Gerd Möllmann
2024-07-14  5:30 ` Pip Cet
2024-07-14  7:00   ` Gerd Möllmann
2024-07-14  7:08     ` Gerd Möllmann
2024-07-16 13:02     ` Gerd Möllmann
2024-07-16 13:38       ` Eli Zaretskii
2024-07-16 13:47         ` Gerd Möllmann
2024-07-16 14:11           ` Eli Zaretskii
2024-07-16 14:39             ` Gerd Möllmann
2024-07-16 15:21               ` Eli Zaretskii
2024-07-16 16:54                 ` Gerd Möllmann
2024-07-16 14:19           ` Helmut Eller
2024-07-16 14:48             ` Gerd Möllmann
2024-07-16 15:22               ` Eli Zaretskii
2024-07-16 16:13               ` Pip Cet
2024-07-16 16:47                 ` Gerd Möllmann
2024-07-17  7:51                 ` Andrea Corallo
2024-07-17 19:47               ` Gerd Möllmann
2024-07-18 15:08                 ` Gerd Möllmann
2024-07-18 16:05                   ` Pip Cet
2024-07-18 16:33                     ` Gerd Möllmann
2024-07-18 19:06                   ` Andrea Corallo
2024-07-18 19:33                     ` Gerd Möllmann
2024-07-19  4:38                       ` Gerd Möllmann
2024-07-23  0:36                         ` Pip Cet
2024-07-23  3:31                           ` Gerd Möllmann
2024-07-16 15:49         ` Paul Eggert

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