* bug#35557: 26.1; false positive: Match data clobbered by buffer modification hooks
@ 2019-05-04 11:35 David Bremner
2019-05-06 5:03 ` Paul Eggert
2022-01-29 14:54 ` Lars Ingebrigtsen
0 siblings, 2 replies; 9+ messages in thread
From: David Bremner @ 2019-05-04 11:35 UTC (permalink / raw)
To: 35557
1. Save the following as test.el
(let ((inhibit-modification-hooks t))
(with-temp-buffer
(insert "P'")
(goto-char (point-min))
(while (re-search-forward "\\([^\\]\\)'" nil t)
(replace-match "\\1`"))
(buffer-substring (point-min) (point-max))))
2. run "emacs --batch --quick --load ./test.el"
3. Under docker, with Debian's emacs-nox (but not emacs-lucid or
emacs-gtk, I get an error "Match data clobbered by buffer modification
hooks".
I don't think this is Debian specific, as someone was also able to
duplicate it with "nixpkgs.emacs26-nox" (also in Docker).
I agree the setup sounds pretty specific, but it is used by a Debian CI
setup, which is why I care.
Here's the build info, copied out of docker:
In GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu)
of 2019-02-03, modified by Debian built on zam904
Recent messages:
Loading /etc/emacs/site-start.d/00debian.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Configured using:
'configure --build x86_64-linux-gnu --prefix=/usr
--sharedstatedir=/var/lib --libexecdir=/usr/lib
--localstatedir=/var/lib --infodir=/usr/share/info
--mandir=/usr/share/man --enable-libsystemd --with-pop=yes
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/sh\
are/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp
--with-sound=alsa --without-gconf --with-mailutils --build
x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
--libexecdir=/usr/lib --localstatedir=/var/lib
--infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd
--with-pop=yes
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/sh\
are/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp
--with-sound=alsa --without-gconf --with-mailutils --with-x=no
--without-gsettings 'CFLAGS=-g -O2
-fdebug-prefix-map=/build/emacs-26.1+1=. -fstack-protector-strong
-Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
-D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'
^ permalink raw reply [flat|nested] 9+ messages in thread* bug#35557: 26.1; false positive: Match data clobbered by buffer modification hooks
2019-05-04 11:35 bug#35557: 26.1; false positive: Match data clobbered by buffer modification hooks David Bremner
@ 2019-05-06 5:03 ` Paul Eggert
2019-11-02 1:00 ` Stefan Kangas
2022-01-29 14:54 ` Lars Ingebrigtsen
1 sibling, 1 reply; 9+ messages in thread
From: Paul Eggert @ 2019-05-06 5:03 UTC (permalink / raw)
To: David Bremner; +Cc: 35557
I tried to reproduce the bug and failed, so I'm afraid you'll have to step in
and help debug it. First, please use 26.2 rather than 26.1. Second, please
simplify the ./configure arguments (there are some duplicates, and
--enable-libsystemd isn't the right name for the flag). Third, I suggest running
it under GDB and seeing what exactly goes wrong, e.g., by putting a watchpoint
on search_regs.start[sub].
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#35557: 26.1; false positive: Match data clobbered by buffer modification hooks
2019-05-06 5:03 ` Paul Eggert
@ 2019-11-02 1:00 ` Stefan Kangas
2019-12-03 2:48 ` David Bremner
0 siblings, 1 reply; 9+ messages in thread
From: Stefan Kangas @ 2019-11-02 1:00 UTC (permalink / raw)
To: Paul Eggert; +Cc: David Bremner, 35557
Paul Eggert <eggert@cs.ucla.edu> writes:
> I tried to reproduce the bug and failed, so I'm afraid you'll have to step in
> and help debug it. First, please use 26.2 rather than 26.1. Second, please
> simplify the ./configure arguments (there are some duplicates, and
> --enable-libsystemd isn't the right name for the flag). Third, I suggest running
> it under GDB and seeing what exactly goes wrong, e.g., by putting a watchpoint
> on search_regs.start[sub].
I couldn't reproduce this bug either.
David, could you please look into the above suggestions by Paul?
Best regards,
Stefan Kangas
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#35557: 26.1; false positive: Match data clobbered by buffer modification hooks
2019-11-02 1:00 ` Stefan Kangas
@ 2019-12-03 2:48 ` David Bremner
2020-01-16 14:23 ` Stefan Kangas
0 siblings, 1 reply; 9+ messages in thread
From: David Bremner @ 2019-12-03 2:48 UTC (permalink / raw)
To: Stefan Kangas, Paul Eggert; +Cc: 35557
Stefan Kangas <stefan@marxist.se> writes:
> Paul Eggert <eggert@cs.ucla.edu> writes:
>
>> I tried to reproduce the bug and failed, so I'm afraid you'll have to step in
>> and help debug it. First, please use 26.2 rather than 26.1. Second, please
>> simplify the ./configure arguments (there are some duplicates, and
>> --enable-libsystemd isn't the right name for the flag). Third, I suggest running
>> it under GDB and seeing what exactly goes wrong, e.g., by putting a watchpoint
>> on search_regs.start[sub].
>
> I couldn't reproduce this bug either.
>
> David, could you please look into the above suggestions by Paul?
FYI I've filed Debian bug 931651 about this. I did duplicate the problem
without docker, and with emacs 26.3, but on an s390x system (and it
seems to be sensitive to _which_ s390x system, so that is a bit
discouraging).
I haven't had time to follow up Paul's suggestions.
d
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#35557: 26.1; false positive: Match data clobbered by buffer modification hooks
2019-12-03 2:48 ` David Bremner
@ 2020-01-16 14:23 ` Stefan Kangas
2020-01-16 15:03 ` David Bremner
0 siblings, 1 reply; 9+ messages in thread
From: Stefan Kangas @ 2020-01-16 14:23 UTC (permalink / raw)
To: David Bremner; +Cc: 35557, Paul Eggert
David Bremner <david@tethera.net> writes:
> Stefan Kangas <stefan@marxist.se> writes:
>
>> Paul Eggert <eggert@cs.ucla.edu> writes:
>>
>>> I tried to reproduce the bug and failed, so I'm afraid you'll have to step in
>>> and help debug it. First, please use 26.2 rather than 26.1. Second, please
>>> simplify the ./configure arguments (there are some duplicates, and
>>> --enable-libsystemd isn't the right name for the flag). Third, I suggest running
>>> it under GDB and seeing what exactly goes wrong, e.g., by putting a watchpoint
>>> on search_regs.start[sub].
>>
>> I couldn't reproduce this bug either.
>>
>> David, could you please look into the above suggestions by Paul?
>
> FYI I've filed Debian bug 931651 about this. I did duplicate the problem
> without docker, and with emacs 26.3, but on an s390x system (and it
> seems to be sensitive to _which_ s390x system, so that is a bit
> discouraging).
>
> I haven't had time to follow up Paul's suggestions.
Thank you. As it seems to be specific to certain s390x machines, I
think we will be dependent on your help to track this down. When you
find the time, it would be very good if you could try the things
suggested by Paul above.
Thanks in advance.
Best regards,
Stefan Kangas
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#35557: 26.1; false positive: Match data clobbered by buffer modification hooks
2020-01-16 14:23 ` Stefan Kangas
@ 2020-01-16 15:03 ` David Bremner
0 siblings, 0 replies; 9+ messages in thread
From: David Bremner @ 2020-01-16 15:03 UTC (permalink / raw)
To: Stefan Kangas; +Cc: 35557, Paul Eggert
Stefan Kangas <stefan@marxist.se> writes:
>> I haven't had time to follow up Paul's suggestions.
>
> Thank you. As it seems to be specific to certain s390x machines, I
> think we will be dependent on your help to track this down. When you
> find the time, it would be very good if you could try the things
> suggested by Paul above.
Well, no, it was also present in a docker environment on X86 for me, and
someone else on #emacs (IRC) using Nix.
d
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#35557: 26.1; false positive: Match data clobbered by buffer modification hooks
2019-05-04 11:35 bug#35557: 26.1; false positive: Match data clobbered by buffer modification hooks David Bremner
2019-05-06 5:03 ` Paul Eggert
@ 2022-01-29 14:54 ` Lars Ingebrigtsen
2022-01-30 19:15 ` David Bremner
1 sibling, 1 reply; 9+ messages in thread
From: Lars Ingebrigtsen @ 2022-01-29 14:54 UTC (permalink / raw)
To: David Bremner; +Cc: 35557
David Bremner <david@tethera.net> writes:
> 1. Save the following as test.el
>
> (let ((inhibit-modification-hooks t))
> (with-temp-buffer
> (insert "P'")
> (goto-char (point-min))
> (while (re-search-forward "\\([^\\]\\)'" nil t)
> (replace-match "\\1`"))
> (buffer-substring (point-min) (point-max))))
>
> 2. run "emacs --batch --quick --load ./test.el"
(I'm going through old bug reports that unfortunately weren't resolved
at the time.)
I don't seem to be able to reproduce this problem with the current
Emacs. Are you still seeing this issue in more recent Emacs versions?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#35557: 26.1; false positive: Match data clobbered by buffer modification hooks
2022-01-29 14:54 ` Lars Ingebrigtsen
@ 2022-01-30 19:15 ` David Bremner
2022-01-30 19:28 ` Lars Ingebrigtsen
0 siblings, 1 reply; 9+ messages in thread
From: David Bremner @ 2022-01-30 19:15 UTC (permalink / raw)
To: Lars Ingebrigtsen; +Cc: 35557
Lars Ingebrigtsen <larsi@gnus.org> writes:
> David Bremner <david@tethera.net> writes:
>
>> 1. Save the following as test.el
>>
>> (let ((inhibit-modification-hooks t))
>> (with-temp-buffer
>> (insert "P'")
>> (goto-char (point-min))
>> (while (re-search-forward "\\([^\\]\\)'" nil t)
>> (replace-match "\\1`"))
>> (buffer-substring (point-min) (point-max))))
>>
>> 2. run "emacs --batch --quick --load ./test.el"
>
> (I'm going through old bug reports that unfortunately weren't resolved
> at the time.)
>
> I don't seem to be able to reproduce this problem with the current
> Emacs. Are you still seeing this issue in more recent Emacs versions?
I can't duplicate it with Debian's 27.1, so it's probably safe to close,
Cheers
David
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2022-01-30 19:28 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2019-05-04 11:35 bug#35557: 26.1; false positive: Match data clobbered by buffer modification hooks David Bremner
2019-05-06 5:03 ` Paul Eggert
2019-11-02 1:00 ` Stefan Kangas
2019-12-03 2:48 ` David Bremner
2020-01-16 14:23 ` Stefan Kangas
2020-01-16 15:03 ` David Bremner
2022-01-29 14:54 ` Lars Ingebrigtsen
2022-01-30 19:15 ` David Bremner
2022-01-30 19:28 ` Lars Ingebrigtsen
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