Bug 1398718

Summary:	Emacs 25.1 fc25 often crashes with emacs-auctex
Product:	[Fedora] Fedora	Reporter:	dirk
Component:	emacs	Assignee:	Jan Synacek <jsynacek>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	25	CC:	jonathan.underwood, jsynacek, msekleta, n.clark.judd, phracek, severian666
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	emacs-25.1-3.fc25	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-12-16 21:01:32 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description dirk 2016-11-25 16:42:04 UTC

Description of problem: On my Fedora 25 x86_64 system Emacs 25.1 crashes very often when LaTeX-ing, using emacs-auctex, texlive-synctex etc. This was definitely not the case with the fc24 version on Fedora 24. (I am using this setting since years almost daily.) This happens under Gnome 3.22 with Xorg and with Wayland. 


Version-Release number of selected component (if applicable):
emacs-25.1-2.fc25 (x86_64)
emacs-auctex-11.89-3.fc24
texlive-synctex-svn40768-18.fc25.1
texlive-18.20160520.fc25

How reproducible:
During a usual TeXing session it occurs at least once.

Steps to Reproduce:
1. Open a latex-file in Emacs, in latex-mode using emacs-auctex.
2. Trigger compiling with (pdf-) latex.
3. Repeat 2. several times, if necessary.

Actual results:
Emacs crashes during compilation session; not each time, but if I do it 5 or 10 times, then it happens very likely.


Expected results:
Emacs should not crash.


Additional info:
I do not know whether this bug is actually restricted to the use of auctex, synctex etc. But in this way I can trigger it very often. The following shows the output in the shell when emacs crashes.

Fatal error 11: Segmentation fault
Backtrace:
emacs[0x50ac9c]
emacs[0x4f114c]
emacs[0x50945e]
emacs[0x509689]
emacs[0x5096ef]
/lib64/libpthread.so.0(+0x115c0)[0x7f6c6c3b25c0]
emacs(re_search_2+0x3a8)[0x541d38]
emacs[0x536c45]
emacs[0x538065]
emacs[0x538257]
emacs[0x565c23]
emacs[0x59ad23]
emacs[0x56564d]
emacs[0x565a4b]
emacs[0x59ad23]
emacs[0x56564d]
emacs[0x565a4b]
emacs[0x59ad23]
emacs[0x56564d]
emacs[0x565a4b]
emacs[0x566ec8]
emacs[0x56711c]
emacs[0x5643ee]
emacs[0x59e7d4]
emacs[0x5a03e2]
emacs[0x5a6f1a]
emacs[0x422f33]
emacs[0x4fd3d1]
emacs[0x4fdf3d]
emacs[0x4ffb84]
emacs[0x564362]
emacs[0x4f1614]
emacs[0x564303]
emacs[0x4f15d0]
emacs[0x4f5dd7]
emacs[0x4f6128]
emacs[0x419d52]
/lib64/libc.so.6(__libc_start_main+0xf1)[0x7f6c6bbb7401]
emacs[0x41a79a]
Speicherzugriffsfehler (Speicherabzug geschrieben)

Comment 1 Paul 2016-12-12 00:41:59 UTC

I confirm that this bug occurs repeatedly on every computer I have that runs Fedora 25 and
emacs-25.1-2.fc25.x86_64
emacs-auctex-11.89-3.fc24.noarch

This is a rather serious bug, please fix.

Comment 2 Jan Synacek 2016-12-12 09:18:30 UTC

According to https://debbugs.gnu.org/cgi/bugreport.cgi?bug=24821#8, there are several patches available upstream. I will try to backport them.

Comment 3 Fedora Update System 2016-12-15 15:04:11 UTC

emacs-25.1-3.fc25 has been submitted as an update to Fedora 25. https://bodhi.fedoraproject.org/updates/FEDORA-2016-0a0829e7dd

Comment 4 dirk 2016-12-15 17:29:18 UTC

With the update I cannot reproduce the described bug. Thanks.

Comment 5 Fedora Update System 2016-12-16 05:33:16 UTC

emacs-25.1-3.fc25 has been pushed to the Fedora 25 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-0a0829e7dd

Comment 6 Fedora Update System 2016-12-16 21:01:32 UTC

emacs-25.1-3.fc25 has been pushed to the Fedora 25 stable repository. If problems still persist, please make note of it in this bug report.

Comment 7 Nick Judd 2017-02-23 01:51:53 UTC

Using the most recent F25 updates with GNOME Wayland, I get an identical segfault while manipulating tex files in LaTeX mode.

Comment 8 Nick Judd 2017-02-23 01:55:47 UTC

(In reply to Nick Judd from comment #7)
> Using the most recent F25 updates with GNOME Wayland, I get an identical
> segfault while manipulating tex files in LaTeX mode.

To clarify, this occurs for me while merely editing tex files. No attempt to render PDFs is necessary to produce the error, and it may crash multiple times in the same session. I am unsure of the precise conditions to duplicate this error; it first occurred around the time of this bug report (late 2016), did not appear for some time, and just returned (around the time I updated to the 4.9.9 kernel). Emacs 25.1.1. Fedora Workstation 25.