Ubuntu
unity8 package

unity8-dash crashed with signal 7 in QMutex::lock() when switching scopes

Bug #1431798 reported by Michał Sawicz on 2015-03-13

This bug affects 3 people

	Status	Importance	Assigned to	Milestone
Canonical System Image	Fix Released	High	Pat McGowan	Canonical System Image ww13-ota
qtdeclarative-opensource-src (Ubuntu)	Fix Released	Medium	Albert Astals Cid
qtdeclarative-opensource-src (Ubuntu RTM)	Fix Released	Medium	Timo Jyrinki
unity8 (Ubuntu)	Invalid	Medium	Unassigned

Bug Description

Original is bug #1431440:

I was simply paging through the scopes ad got this crash.
I swiped in in the open dialer app and then I see the scopes restarting
Reproduced three times in a row,and after a reboot.

mako running 213 rtm

ProblemType: Crash
DistroRelease: Ubuntu RTM 14.09
Package: unity8 8.02+15.04.20150226~rtm-0ubuntu1
Uname: Linux 3.4.0-5-mako armv7l
ApportVersion: 2.14.7-0ubuntu8
Architecture: armhf
CurrentDesktop: Unity
Date: Thu Mar 12 12:05:54 2015
ExecutablePath: /usr/bin/unity8-dash
ExecutableTimestamp: 1424989859
InstallationDate: Installed on 2015-03-12 (1 days ago)
InstallationMedia: Ubuntu Utopic Unicorn (development branch) - armhf (20150312-002053)
LocalLibraries: /android/system/lib/libadreno_utils.so /android/system/lib/egl/eglsubAndroid.so /android/system/lib/libcorkscrew.so /android/system/lib/libGLESv1_CM.so /android/system/lib/libGLES_trace.so /android/system/lib/hw/gralloc.msm8960.so /android/system/lib/libmemalloc.so /android/system/lib/libui.so /android/system/lib/libGLESv2.so /android/system/lib/libhardware.so /android/system/lib/libc.so /android/system/lib/libstdc++.so /android/system/lib/libstlport.so /android/system/lib/libdsyscalls.so /android/system/lib/libm.so /android/system/lib/libsync.so /android/system/lib/libsc-a3xx.so /android/system/lib/libz.so /android/system/lib/libcutils.so /android/system/lib/egl/libGLESv1_CM_adreno.so /android/system/lib/libqdutils.so /android/system/lib/libgccdemangle.so /android/system/lib/libgsl.so /android/system/lib/libutils.so /android/system/lib/egl/libEGL_adreno.so /android/system/lib/egl/libGLESv2_adreno.so /android/system/lib/liblog.so /android/system/lib/libEGL.so
ProcCmdline: unity8-dash --desktop_file_hint=/usr/share/applications/unity8-dash.desktop
ProcCwd: /home/phablet
Signal: 7
SourcePackage: unity8
StacktraceTop:
QMutex::lock() () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
QCoreApplication::postEvent(QObject*, QEvent*, int) () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
?? () from /usr/lib/arm-linux-gnueabihf/libQt5Quick.so.5
Title: unity8-dash crashed with signal 7 in QMutex::lock()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dialout dip plugdev sudo tty video

See original description

Tags:

Related branches

lp:~kubuntu-packagers/kubuntu-packaging/qtdeclarative-opensource-src_530_rtm

lp:ubuntu/vivid-proposed/qtdeclarative-opensource-src

lp:~kubuntu-packagers/kubuntu-packaging/qtdeclarative-opensource-src

Revision history for this message

Michał Sawicz (saviq) wrote on 2015-03-13:

Dependencies.txt Edit (23.4 KiB, text/plain; charset="utf-8")
Disassembly.txt Edit (1011 bytes, text/plain; charset="utf-8")
ProcEnviron.txt Edit (335 bytes, text/plain; charset="utf-8")
ProcMaps.txt Edit (102.9 KiB, text/plain; charset="utf-8")
ProcStatus.txt Edit (841 bytes, text/plain; charset="utf-8")
Registers.txt Edit (574 bytes, text/plain; charset="utf-8")
Stacktrace.txt Edit (454 bytes, text/plain; charset="utf-8")
SystemImageInfo.txt Edit (220 bytes, text/plain; charset="utf-8")
ThreadStacktrace.txt Edit (30.7 KiB, text/plain; charset="utf-8")
upstart.unity8-dash.log.txt Edit (2.2 KiB, text/plain; charset="utf-8")
upstart.unity8.log.txt Edit (3.6 KiB, text/plain; charset="utf-8")

Revision history for this message

Apport retracing service (apport) wrote on 2015-03-13:

StacktraceTop:
testAndSetRelaxed<QMutexData*> (currentValue=<synthetic pointer>, newValue=0x1, expectedValue=0x0, _q_value=@0x2ba8b45: 0x5002b30e) at ../../include/QtCore/../../src/corelib/arch/qatomic_armv6.h:189
testAndSetAcquire<QMutexData*, QMutexData*> (currentValue=<synthetic pointer>, newValue=0x1, expectedValue=0x0, _q_value=@0x2ba8b45: 0x5002b30e) at ../../include/QtCore/../../src/corelib/thread/qgenericatomic.h:174
testAndSetAcquire (currentValue=<synthetic pointer>, newValue=0x1, expectedValue=0x0, this=0x2ba8b45, this@entry=0x1) at ../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:284
fastTryLock (current=<synthetic pointer>, this=0x2ba8b45, this@entry=0x1) at thread/qmutex.h:90
QMutex::lock (this=this@entry=0x2ba8b45) at thread/qmutex.cpp:220

Revision history for this message

Apport retracing service (apport) wrote on 2015-03-13: Stacktrace.txt

Stacktrace.txt Edit (9.6 KiB, text/plain)

Revision history for this message

Apport retracing service (apport) wrote on 2015-03-13: ThreadStacktrace.txt

ThreadStacktrace.txt Edit (148.7 KiB, text/plain)

Changed in unity8 (Ubuntu):
importance:	Undecided → Medium
tags:	removed: need-armhf-retrace

Revision history for this message

Launchpad Janitor (janitor) wrote on 2015-03-13:

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

Changed in unity8 (Ubuntu):
status:	New → Confirmed

Michał Sawicz (saviq) on 2015-03-13

information type:	Private → Public
description:	updated

Revision history for this message

Michał Sawicz (saviq) wrote on 2015-03-13:

Unfortunately there's nothing suggesting what's gone wrong (or even why it crashed) in the traces. The trace does look corrupted, as thread order is impossible - the main thread is reported to be that of the pixmap reader...

Pat, if you can reproduce, can you please clear your /var/crash and trigger the crash again and upload it here.

Changed in unity8 (Ubuntu):
status:	Confirmed → Incomplete

Revision history for this message

Pat McGowan (pat-mcgowan) wrote on 2015-03-14:

_usr_bin_unity8-dash.32011.crash Edit (39.8 MiB, text/plain)

Michał Sawicz (saviq) on 2015-03-16

Changed in unity8 (Ubuntu):
status:	Incomplete → Triaged
status:	Triaged → In Progress
assignee:	nobody → Albert Astals Cid (aacid)

Revision history for this message

Albert Astals Cid (aacid) wrote on 2015-03-16:

I can't prove it since i can not reproduce it but after staring at the backtrace a lot and reading the code even more lots i came up with
https://codereview.qt-project.org/#/c/108700/

That seems like it should be a proper patch for fixing this crash.

Let's see what upstream thinks

Revision history for this message

Albert Astals Cid (aacid) wrote on 2015-03-17:

https://codereview.qt-project.org/#/c/108700/ has been accepted upstream and is now in the process of merging.

Changed in unity8 (Ubuntu):
status:	In Progress → Invalid
Changed in qtdeclarative-opensource-src (Ubuntu):
importance:	Undecided → Medium
assignee:	nobody → Albert Astals Cid (aacid)
Changed in unity8 (Ubuntu):
assignee:	Albert Astals Cid (aacid) → nobody
Changed in qtdeclarative-opensource-src (Ubuntu):
status:	New → In Progress

Revision history for this message

Albert Astals Cid (aacid) wrote on 2015-03-17:

#10

Pat, should we land this bugfix in qtdeclarative for the ww13-ota milestone or just for vivid?

Timo Jyrinki (timo-jyrinki) on 2015-03-20

Changed in qtdeclarative-opensource-src (Ubuntu RTM):
importance:	Undecided → Medium
assignee:	nobody → Timo Jyrinki (timo-jyrinki)
status:	New → In Progress

Revision history for this message

Timo Jyrinki (timo-jyrinki) wrote on 2015-03-20:

#11

(the answer was yes)

The rtm fix is testable at rtm-003 https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu-rtm/landing-003

Vivid fix in vivid-021 although together with bug #1421009 (possible) fix.

Revision history for this message

Launchpad Janitor (janitor) wrote on 2015-03-24:

#12

This bug was fixed in the package qtdeclarative-opensource-src - 5.3.0-3ubuntu15~rtm1

---------------
qtdeclarative-opensource-src (5.3.0-3ubuntu15~rtm1) 14.09; urgency=medium

* debian/patches/Always-remove-reply-from-replies-when-processing-can.patch:
- Fix crasher (LP: #1431798)
-- Timo Jyrinki <email address hidden> Thu, 19 Mar 2015 10:46:58 +0000

Changed in qtdeclarative-opensource-src (Ubuntu RTM):
status:	In Progress → Fix Released

Pat McGowan (pat-mcgowan) on 2015-03-24

Changed in canonical-devices-system-image:
status:	New → Fix Released
importance:	Undecided → High
milestone:	none → ww13-ota
assignee:	nobody → Pat McGowan (pat-mcgowan)

Revision history for this message

Launchpad Janitor (janitor) wrote on 2015-03-27:

#13

This bug was fixed in the package qtdeclarative-opensource-src - 5.4.1-1ubuntu4

---------------
qtdeclarative-opensource-src (5.4.1-1ubuntu4) vivid; urgency=medium

* debian/patches/Always-remove-reply-from-replies-when-processing-can.patch:
- Fix a crash when switching scopes (LP: #1431798)
-- Timo Jyrinki <email address hidden> Fri, 20 Mar 2015 13:26:18 +0000

Changed in qtdeclarative-opensource-src (Ubuntu):
status:	In Progress → Fix Released

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unity8-dash crashed with signal 7 in QMutex::lock() when switching scopes

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