; * etc/PROBLEMS: Rearrange and update the section about crashes.
This commit is contained in:
Eli Zaretskii
parent
c2e3cd6694
commit
550887c90b
1 changed files with 101 additions and 93 deletions
194
etc/PROBLEMS
194
etc/PROBLEMS
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@ -123,98 +123,6 @@ load-path.
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* Crash bugs
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** Emacs crashes when running in a terminal, if compiled with GCC 4.5.0
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This version of GCC is buggy: see
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https://debbugs.gnu.org/6031
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43904
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You can work around this error in gcc-4.5 by omitting sibling call
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optimization. To do this, configure Emacs with
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./configure CFLAGS="-g -O2 -fno-optimize-sibling-calls"
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** Emacs compiled with GCC 4.6.1 crashes on MS-Windows when C-g is pressed
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This is known to happen when Emacs is compiled with MinGW GCC 4.6.1
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with the -O2 option (which is the default in the Windows build). The
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reason is a bug in MinGW GCC 4.6.1; to work around, either add the
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'-fno-omit-frame-pointer' switch to GCC or compile without
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optimizations ('--no-opt' switch to the configure.bat script).
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** Emacs crashes in x-popup-dialog.
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This can happen if the dialog widget cannot find the font it wants to
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use. You can work around the problem by specifying another font with
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an X resource--for example, 'Emacs.dialog*.font: 9x15' (or any font that
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happens to exist on your X server).
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** Emacs crashes when you use Bibtex mode.
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This happens if your system puts a small limit on stack size. You can
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prevent the problem by using a suitable shell command (often 'ulimit')
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to raise the stack size limit before you run Emacs.
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Patches to raise the stack size limit automatically in 'main'
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(src/emacs.c) on various systems would be greatly appreciated.
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** Error message 'Symbol’s value as variable is void: x', followed by
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a segmentation fault and core dump.
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This has been tracked to a bug in tar! People report that tar erroneously
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added a line like this at the beginning of files of Lisp code:
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x FILENAME, N bytes, B tape blocks
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If your tar has this problem, install GNU tar--if you can manage to
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untar it :-).
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** Emacs can crash when displaying PNG images with transparency.
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This is due to a bug introduced in ImageMagick 6.8.2-3. The bug should
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be fixed in ImageMagick 6.8.3-10. See <URL:https://debbugs.gnu.org/13867>.
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** Crashes when displaying GIF images in Emacs built with version
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libungif-4.1.0 are resolved by using version libungif-4.1.0b1.
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Configure checks for the correct version, but this problem could occur
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if a binary built against a shared libungif is run on a system with an
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older version.
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** SVG images may be cropped incorrectly with librsvg 2.45 and below.
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Librsvg 2.46 and above have improved geometry code which Emacs is able
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to take advantage of.
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** Emacs aborts inside the function 'tparam1'.
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This can happen if Emacs was built without terminfo support, but the
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terminal's capabilities use format that is only supported by terminfo.
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If your system has ncurses installed, this might happen if your
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version of ncurses is broken; upgrading to a newer version of ncurses
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and reconfiguring and rebuilding Emacs should solve this.
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All modern systems support terminfo, so even if ncurses is not the
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problem, you should look for a way to configure Emacs so that it uses
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terminfo when built.
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** Emacs crashes when using some version of the Exceed X server.
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Upgrading to a newer version of Exceed has been reported to prevent
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these crashes. You should consider switching to a free X server, such
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as Xming or Cygwin/X.
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** Emacs crashes with SIGSEGV in XtInitializeWidgetClass.
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It crashes on X, but runs fine when called with option "-nw".
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This has been observed when Emacs is linked with GNU ld but without passing
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the -z nocombreloc flag. Emacs normally knows to pass the -z nocombreloc
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flag when needed, so if you come across a situation where the flag is
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necessary but missing, please report it via M-x report-emacs-bug.
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On platforms such as Solaris, you can also work around this problem by
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configuring your compiler to use the native linker instead of GNU ld.
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** When Emacs is compiled with Gtk+, closing a display kills Emacs.
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There is a long-standing bug in GTK that prevents it from recovering
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@ -274,7 +182,15 @@ before starting Emacs, or run Emacs as root.
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One possible reason for this could be a bug in the libotf or the
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libm17n-flt/m17n-db libraries Emacs uses for displaying complex
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scripts. Make sure you have the latest versions of these libraries
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scripts.
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The easiest and the recommended way of solving these crashes is to
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build Emacs with HarfBuzz as the shaping engine library instead of
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libm17n-flt. Building with HarfBuzz is the default since Emacs 27.1.
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If you must use libm17n-flt, read on.
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Make sure you have the latest versions of these libraries
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installed. If the problem still persists with the latest released
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versions of these libraries, you can try building these libraries from
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their CVS repository:
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@ -322,6 +238,98 @@ element from LD_LIBRARY_PATH before starting emacs proper.
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Or you could recompile Emacs with an -Wl,-rpath option that
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gives the location of the correct libotf.
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** Emacs crashes in x-popup-dialog.
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This can happen if the dialog widget cannot find the font it wants to
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use. You can work around the problem by specifying another font with
|
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an X resource--for example, 'Emacs.dialog*.font: 9x15' (or any font that
|
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happens to exist on your X server).
|
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** Emacs crashes when you use Bibtex mode.
|
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|
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This happens if your system puts a small limit on stack size. You can
|
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prevent the problem by using a suitable shell command (often 'ulimit')
|
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to raise the stack size limit before you run Emacs.
|
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|
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Patches to raise the stack size limit automatically in 'main'
|
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(src/emacs.c) on various systems would be greatly appreciated.
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|
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** Error message 'Symbol’s value as variable is void: x', followed by
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a segmentation fault and core dump.
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This has been tracked to a bug in tar! People report that tar erroneously
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added a line like this at the beginning of files of Lisp code:
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x FILENAME, N bytes, B tape blocks
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|
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If your tar has this problem, install GNU tar--if you can manage to
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untar it :-).
|
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** Emacs crashes when running in a terminal, if compiled with GCC 4.5.0
|
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|
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This version of GCC is buggy: see
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https://debbugs.gnu.org/6031
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43904
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You can work around this error in gcc-4.5 by omitting sibling call
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optimization. To do this, configure Emacs with
|
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|
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./configure CFLAGS="-g -O2 -fno-optimize-sibling-calls"
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** Emacs compiled with GCC 4.6.1 crashes on MS-Windows when C-g is pressed
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|
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This is known to happen when Emacs is compiled with MinGW GCC 4.6.1
|
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with the -O2 option (which is the default in the Windows build). The
|
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reason is a bug in MinGW GCC 4.6.1; to work around, either add the
|
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'-fno-omit-frame-pointer' switch to GCC or compile without
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optimizations ('--no-opt' switch to the configure.bat script).
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** Emacs can crash when displaying PNG images with transparency.
|
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|
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This is due to a bug introduced in ImageMagick 6.8.2-3. The bug should
|
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be fixed in ImageMagick 6.8.3-10. See <URL:https://debbugs.gnu.org/13867>.
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** Crashes when displaying GIF images in Emacs built with version
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libungif-4.1.0 are resolved by using version libungif-4.1.0b1.
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Configure checks for the correct version, but this problem could occur
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if a binary built against a shared libungif is run on a system with an
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older version.
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** SVG images may be cropped incorrectly with librsvg 2.45 and below.
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Librsvg 2.46 and above have improved geometry code which Emacs is able
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to take advantage of.
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** Emacs aborts inside the function 'tparam1'.
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This can happen if Emacs was built without terminfo support, but the
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terminal's capabilities use format that is only supported by terminfo.
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If your system has ncurses installed, this might happen if your
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version of ncurses is broken; upgrading to a newer version of ncurses
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and reconfiguring and rebuilding Emacs should solve this.
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All modern systems support terminfo, so even if ncurses is not the
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problem, you should look for a way to configure Emacs so that it uses
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terminfo when built.
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** Emacs crashes when using some version of the Exceed X server.
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Upgrading to a newer version of Exceed has been reported to prevent
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these crashes. You should consider switching to a free X server, such
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as Xming or Cygwin/X.
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** Emacs crashes with SIGSEGV in XtInitializeWidgetClass.
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It crashes on X, but runs fine when called with option "-nw".
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This has been observed when Emacs is linked with GNU ld but without passing
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the -z nocombreloc flag. Emacs normally knows to pass the -z nocombreloc
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flag when needed, so if you come across a situation where the flag is
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necessary but missing, please report it via M-x report-emacs-bug.
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On platforms such as Solaris, you can also work around this problem by
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configuring your compiler to use the native linker instead of GNU ld.
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* Problems when reading or debugging Emacs C code
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Because Emacs does not install a copy of its C source code, users
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