Ubuntu
xfce4-settings package

xfsettingsd crashed with SIGSEGV

Bug #1837071 reported by Thomas A. F. Thorne on 2019-07-18

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	Xfce4 Settings	Fix Released	Medium	xfce-bugs #16017
	xfce4-settings (Ubuntu)	Fix Released	Medium	Unassigned

Bug Description

Crashed whil trying to setup VNC from Windows into Ubuntu.

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: xfce4-settings 4.12.4-0ubuntu0.18.04.1
ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18
Uname: Linux 4.15.0-45-generic x86_64
NonfreeKernelModules: lkp_Ubuntu_4_15_0_45_48_generic_51
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CrashCounter: 1
CurrentDesktop: ubuntu:GNOME
Date: Thu Jul 18 16:27:11 2019
ExecutablePath: /usr/bin/xfsettingsd
InstallationDate: Installed on 2017-11-16 (609 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
ProcCmdline: xfsettingsd
SegvAnalysis:
Segfault happened at: 0x7f0f6a3a9337: mov 0x18(%rdx),%rax
PC (0x7f0f6a3a9337) ok
source "0x18(%rdx)" (0x00000018) not located in a known VMA region (needed readable region)!
destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: xfce4-settings
StacktraceTop:
() at /usr/lib/x86_64-linux-gnu/libxklavier.so.16
()
g_type_create_instance () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
() at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
g_object_new_with_properties () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: xfsettingsd crashed with SIGSEGV
UpgradeStatus: Upgraded to bionic on 2018-07-27 (356 days ago)
UserGroups: adm cdrom dialout dip docker lpadmin plugdev sambashare sudo wireshark

Tags:

Revision history for this message

Thomas A. F. Thorne (tafthorne) wrote on 2019-07-18:

Dependencies.txt Edit (8.0 KiB, text/plain; charset="utf-8")
Disassembly.txt Edit (608 bytes, text/plain; charset="utf-8")
JournalErrors.txt Edit (97.1 KiB, text/plain; charset="utf-8")
ProcCpuinfoMinimal.txt Edit (1.2 KiB, text/plain; charset="utf-8")
ProcEnviron.txt Edit (134 bytes, text/plain; charset="utf-8")
ProcMaps.txt Edit (44.0 KiB, text/plain; charset="utf-8")
ProcStatus.txt Edit (1.3 KiB, text/plain; charset="utf-8")
Registers.txt Edit (840 bytes, text/plain; charset="utf-8")
Stacktrace.txt Edit (1.1 KiB, text/plain; charset="utf-8")
ThreadStacktrace.txt Edit (4.5 KiB, text/plain; charset="utf-8")

Revision history for this message

Apport retracing service (apport) wrote on 2019-07-18:

StacktraceTop:
xkl_config_rec_get_full_from_server (rules_file_out=rules_file_out@entry=0x0, data=0x7f0f540056c0, engine=0x0) at xklavier_props.c:182
xkl_config_rec_get_from_server (data=<optimized out>, engine=<optimized out>) at xklavier_props.c:273
xfce_keyboard_layout_helper_init (helper=0x558400e2d850) at keyboard-layout.c:121
g_type_create_instance () from /tmp/apport_sandbox_0a5dkvl4/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
?? () from /tmp/apport_sandbox_0a5dkvl4/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0

Revision history for this message

Apport retracing service (apport) wrote on 2019-07-18: Stacktrace.txt

Stacktrace.txt Edit (1.8 KiB, text/plain)

Revision history for this message

Apport retracing service (apport) wrote on 2019-07-18: StacktraceSource.txt

StacktraceSource.txt Edit (1.8 KiB, text/plain)

Revision history for this message

Apport retracing service (apport) wrote on 2019-07-18: ThreadStacktrace.txt

ThreadStacktrace.txt Edit (3.7 KiB, text/plain)

Changed in xfce4-settings (Ubuntu):
importance:	Undecided → Medium
tags:	removed: need-amd64-retrace

Thomas A. F. Thorne (tafthorne) on 2019-08-08

information type:

Private → Public

Revision history for this message

In Xfce Bugzilla #16017, Dmitry Katsubo (dma-k) wrote on 2019-10-08:

In my case xfsettingsd results segfault during the session startup:

[Tue Oct 8 11:14:22 2019] xfsettingsd[2538]: segfault at 18 ip 00007fc318301f2d sp 00007ffdcfc9f2d0 error 4 in libxklavier.so.16.4.0[7fc3182f7000+d000]
[Tue Oct 8 11:14:22 2019] Code: 48 89 45 28 48 c1 e2 03 4a 8d 7c e0 08 e8 eb 51 ff ff e9 1e fe ff ff e8 11 5a ff ff 90 41 54 48 89 d1 49 89 fc 55 48 89 f5 53 <48> 8b 42 18 48 89 d3 48 89 fa 48 89 ef 48 8b b0 28 01 00 00 e8 0a
[Tue Oct 8 11:14:22 2019] traps: light-locker[2510] trap int3 ip:7f017b666c75 sp:7fff462b5400 error:0 in libglib-2.0.so.0.5800.3[7f017b62e000+7e000]

When I start xfsettingsd afterwards from xterm, it starts and functions correctly. I have difficulty capturing the backtrace with gdb unless somebody can give a hint how to do it. I have added

export XFSETTINGSD_DEBUG=1
ulimit -c unlimited
/etc/X11/Xsession

to ./.vnc/xstartup but it does not generate a core dump :(

Additional info:

* Debian Buster, uname: 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u1 (2019-09-20) x86_64 GNU/Linux
* xfce4-settings:amd64 v4.12.4-1
* libxklavier16:amd64 v5.4-4
* Xfce is running under tightvncserver.

Revision history for this message

In Xfce Bugzilla #16017, Theo Linkspfeifer (lastonestanding) wrote on 2019-10-08:

Ubuntu bug report:
https://bugs.launchpad.net/ubuntu/+source/xfce4-settings/+bug/1837071

You could try using systemd-coredump to obtain a backtrace.

https://www.freedesktop.org/software/systemd/man/systemd-coredump.html

Revision history for this message

In Xfce Bugzilla #16017, Dmitry Katsubo (dma-k) wrote on 2019-10-13:

Backtrace:

Stack trace of thread 2513:
#0 0x00007ff6195b4f2d n/a (libxklavier.so.16)
#1 0x000055f59a9c9b15 n/a (xfsettingsd)
#2 0x00007ff618dec107 g_type_create_instance (libgobject-2.0.so.0)
#3 0x00007ff618dce548 n/a (libgobject-2.0.so.0)
#4 0x00007ff618dcfcc5 g_object_new_with_properties (libgobject-2.0.so.0)
#5 0x00007ff618dd0731 g_object_new (libgobject-2.0.so.0)
#6 0x000055f59a9c584c n/a (xfsettingsd)
#7 0x00007ff618ad909b __libc_start_main (libc.so.6)
#8 0x000055f59a9c5ada n/a (xfsettingsd)

It matches one provided in above mentioned bug (I've compared with https://launchpadlibrarian.net/433653979/Stacktrace.txt).

Revision history for this message

In Xfce Bugzilla #16017, Gitbot (gitbot) wrote on 2020-04-12:

Sean Davis referenced this bugreport in commit b73852916f1b9f47466dd2d1c22c433ae3ee4528

Handle failure to get Xkl engine for display (bug #16017)

https://git.xfce.org/xfce/xfce4-settings/commit?id=b73852916f1b9f47466dd2d1c22c433ae3ee4528

Revision history for this message

In Xfce Bugzilla #16017, Gitbot (gitbot) wrote on 2020-04-12:

#10

Sean Davis referenced this bugreport in commit 9fc73425ab3bea380872bac813ce45890b4070d6

Handle failure to get Xkl engine for display (bug #16017)

https://git.xfce.org/xfce/xfce4-settings/commit?id=9fc73425ab3bea380872bac813ce45890b4070d6

Revision history for this message

In Xfce Bugzilla #16017, Bluesabre-1 (bluesabre-1) wrote on 2020-04-12:

#11

The above commits (xfce-4.14 and master) should resolve this error. This issue came down to xkl_engine_get_instance occasionally returning NULL, but the rest of the code assumed it was always successful. If possible, please test this and let us know if you see any other issues.

Bug Watch Updater (bug-watch-updater) on 2020-04-12

Changed in xfce4-settings:
importance:	Unknown → Medium
status:	Unknown → Fix Released

Revision history for this message

Launchpad Janitor (janitor) wrote on 2020-04-12:

#12

This bug was fixed in the package xfce4-settings - 4.14.3-0ubuntu1

---------------
xfce4-settings (4.14.3-0ubuntu1) focal; urgency=medium

* New upstream bugfix release.
- Fixes xfsettingsd crash with VNC (LP: #1837071)

-- Sean Davis <email address hidden> Sun, 12 Apr 2020 12:15:12 -0400

Changed in xfce4-settings (Ubuntu):
status:	New → Fix Released

Revision history for this message

AlexXXX (avd-84) wrote on 2021-12-24:

#13

i have same bug in 4.14.3-0ubuntu1
i make screenshot but can't paste it here

Report a bug

This report contains Public information

Everyone can see this information.

Duplicates of this bug

You are

Subscribing...

Edit bug mail

Other bug subscribers

Related blueprints

Xubuntu 20.04: Bugs

Remote bug watches

xfce-bugs #16017
[RESOLVED FIXED] Edit

Bug watches keep track of this bug in other bug trackers.

Ubuntuxfce4-settings package

xfsettingsd crashed with SIGSEGV

Bug Description

Duplicates of this bug

Other bug subscribers

Related blueprints

Bug attachments

Remote bug watches

Ubuntu
xfce4-settings package