--- Begin Message ---
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Subject: |
24.3.50; Same GC crash |
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Date: |
Wed, 22 Jan 2014 10:31:41 -0500 |
The same sort of GC crash related to the symbol clear-temporary-overlay-map
has happened again. The symbol name is different but the crash
looked the same.
In GNU Emacs 24.3.50.19 (mips64el-unknown-linux-gnu, GTK+ Version 2.20.1)
of 2014-01-20 on chiefs-gnewsense
Repository revision: 116080 address@hidden
System Description: gNewSense GNU/Linux 3.0 (parkes)
Configured using:
`configure 'CFLAGS=-g -O0''
Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: RMAIL
Minor modes in effect:
shell-dirtrack-mode: t
gpm-mouse-mode: t
tooltip-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
buffer-read-only: t
line-number-mode: t
transient-mark-mode: t
abbrev-mode: t
Recent messages:
Wrote /home/rms/foo.html
Mark set [2 times]
Auto-saving...done
Mark set
Beginning of buffer
Mark set
Auto-saving...done
Sending...
Wrote /home/rms/outgoing/out-33
Sending...done
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/home/rms/emacs-bzr/trunk/lisp/leim/quail/tibetan hides
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Features:
(shadow emacsbug ispell mule-util find-func debug dired-aux jka-compr
epa-mail epa derived epg epg-config dabbrev rmailsum quail help-mode
rmailout shell pcomplete grep mailalias qp warnings dframe cl-macs gv
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byte-compile cconv misearch multi-isearch vc-bzr rmailmm message
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tabulated-list newcomment lisp-mode prog-mode register page menu-bar
rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax
facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak
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backquote make-network-process dbusbind gfilenotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty emacs)
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--- End Message ---
--- Begin Message ---
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Subject: |
Re: bug#17168: 24.3.50; Segfault at mark_object |
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Date: |
Mon, 07 Apr 2014 12:28:20 -0400 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) |
> Anyway, I'd like to get a fix into emacs-24 soon so we can make sure
> we've fixed the GC bug.
I installed a fix into emacs-24, which lets all symbols be uninterned.
> Are you vetoing the general approach used in this patch?
No: I think disallowing unintern is a good idea, but not for emacs-24.
Indeed, as it turns out, the only non-pure objects referenced from pure
space are symbols and distinguishing uninterned from interned reduces
the number of such "pinned" objects from about 10K to about 250.
Rather than scan all symbols to find the pinned ones, the code
I installed into emacs-24 keeps a pointer to the first symbol_block
that contains a pinned symbol. This way we only scan about 15K symbols
at the beginning of every GC cycle to mark those 10K pinned symbols.
Compared to keeping a vector of 10K object, this seems like
a good tradeoff.
For trunk, we could disallow uninterning pinned symbols, at which point
it's worth the trouble to build a vector of those 250 remaining
pinned symbols.
Stefan
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