Ubuntu
libfm package

lxpanel crashed with SIGSEGV in expand_exec_macros()

Bug #1421508 reported by d-d-2
18
This bug affects 2 people
Affects Status Importance Assigned to Milestone
libfm (Ubuntu)
New
Undecided
Unassigned
lxpanel (Ubuntu)
Incomplete
Medium
Unassigned

Bug Description

I tried to launch Firefox, then immediately tried to launch "Photo Lens for Unity," from the Application Launch Bar (aka quick launch bar) on the panel.

I assume lxpanel doesn't like "Photo Lens for Unity" very much.

This crash happened, and I'm honestly not sure why, but I guess it's because of the Photo Lens for Unity.

System Info:

Vivid Vervet

"apt-cache policy lxpanel" gives me the following

lxpanel:
  Installed: 0.7.2-1ubuntu2
  Candidate: 0.7.2-1ubuntu2
  Version table:
 *** 0.7.2-1ubuntu2 0
        500 http://us.archive.ubuntu.com/ubuntu/ vivid/universe i386 Packages
        100 /var/lib/dpkg/status

Expected: I'm honestly not sure what I expected to happen

What happened instead: lxpanel seemed to struggle for 15 seconds, then crashed and restarted. Changes I had made to the Application Launch Bar widget were thrown out, but I may not have saved them by the time I crashed the lxpanel.

ProblemType: Crash
DistroRelease: Ubuntu 15.04
Package: lxpanel 0.7.2-1ubuntu2
ProcVersionSignature: Ubuntu 3.18.0-13.14-generic 3.18.5
Uname: Linux 3.18.0-13-generic i686
NonfreeKernelModules: wl
ApportVersion: 2.16.1-0ubuntu2
Architecture: i386
Config_Home_Lubuntu:
 [Command]
 Logout=lxsession-default quit
CurrentDesktop: LXDE
Date: Thu Feb 12 23:19:39 2015
ExecutablePath: /usr/bin/lxpanel
InstallationDate: Installed on 2015-02-11 (1 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha i386 (20150211)
ProcCmdline: lxpanel --profile Lubuntu
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0xb7667ad4: movsbl (%edi),%edx
 PC (0xb7667ad4) ok
 source "(%edi)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%edx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: lxpanel
StacktraceTop:
 ?? () from /usr/lib/i386-linux-gnu/libfm.so.4
 fm_app_info_launch () from /usr/lib/i386-linux-gnu/libfm.so.4
 fm_app_info_launch_uris () from /usr/lib/i386-linux-gnu/libfm.so.4
 fm_launch_desktop_entry () from /usr/lib/i386-linux-gnu/libfm.so.4
 fm_launch_files () from /usr/lib/i386-linux-gnu/libfm.so.4
Title: lxpanel crashed with SIGSEGV in fm_app_info_launch()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

Revision history for this message
d-d-2 (dandromb) wrote :
Revision history for this message
Apport retracing service (apport) wrote :

StacktraceTop:
 expand_exec_macros (launching=<optimized out>, gfiles=<optimized out>, kf=<optimized out>, full_desktop_path=<optimized out>, app=<optimized out>) at base/fm-app-info.c:92
 do_launch (appinfo=0xb7d56300, full_desktop_path=0xb7a8a848 "", kf=0xb7c23e00, inp=0xbfccef24, ctx=0xb7ce6d50, err=0xbfccefa8) at base/fm-app-info.c:246
 fm_app_info_launch (appinfo=0xbfccefa8, files=0x0, launch_context=0xb7ce6d50, error=0xbfccefa8) at base/fm-app-info.c:362
 fm_app_info_launch_uris (appinfo=0xb7d85628, uris=<optimized out>, launch_context=0xb7ce6d50, error=0xbfccefa8) at base/fm-app-info.c:443
 fm_launch_desktop_entry (ctx=0xb7ce6d50, file_or_id=0xb7d49f78 "/usr/share/applications/unity-lens-photos.desktop", uris=0x0, launcher=0xbfccf0f4, user_data=0xbfccf0e8) at base/fm-file-launcher.c:82

Revision history for this message
Apport retracing service (apport) wrote : Stacktrace.txt
Revision history for this message
Apport retracing service (apport) wrote : StacktraceSource.txt
Revision history for this message
Apport retracing service (apport) wrote : ThreadStacktrace.txt
Changed in lxpanel (Ubuntu):
importance: Undecided → Medium
summary: - lxpanel crashed with SIGSEGV in fm_app_info_launch()
+ lxpanel crashed with SIGSEGV in expand_exec_macros()
tags: removed: need-i386-retrace
d-d-2 (dandromb)
information type: Private → Public
Revision history for this message
LStranger (andrej-rep) wrote :

In fact, it is not a bug in lxpanel, but rather two other bugs:
1) the file /usr/share/applications/unity-lens-photos.desktop (from package unity-lens-photos) is invalid as it does not contain mandatory Exec line;
2) the libfm (from package libfm4) does not check for missing Exec key and therefore crashes.
The upstream of libfm is notified about the crash, see https://sourceforge.net/p/pcmanfm/bugs/953/ bugreport.

Revision history for this message
Guasong (musclorr) wrote :

I believe this is still occuring in Lubuntu 16.04. I got a segmentation fault in expand_exec_macros while creating a shortcut using lxshortcut. See attached stacktrace

LiveMediaBuild: Lubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160102)

Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in lxpanel (Ubuntu):
status: New → Confirmed
Revision history for this message
Chris Guiver (guiverc) wrote :

Thank you for reporting this bug to Ubuntu.

Ubuntu 15.04 (vivid) reached end-of-life on February 4, 2016.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in.

Changed in lxpanel (Ubuntu):
status: Confirmed → Incomplete
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