[Bug 1450137] Re: Qt5 applications crash when switching screens

[Timo Jyrinki]

qtbase-opensource-src (5.5.1+dfsg-6ubuntu3) xenial; urgency=medium

  * debian/patches/enable-tests.patch:
- Replace the non-DFSG-free RFC files with public domain content.
- Adjust tests to the new files.
(LP: #1522442)
  * debian/copyright: mention the replacement.
  * Switch to opt-in for architectures to run tests on.

 -- Timo Jyrinki   Mon, 07 Dec 2015 14:02:11
+

qtbase-opensource-src (5.5.1+dfsg-6ubuntu2) xenial; urgency=high

  * Skip largefile test on s390x too, in addition to amd64.
  * Make tests to keep going till the end with -k.

 -- Dimitri John Ledkov   Fri, 04 Dec 2015 16:54:28
+

qtbase-opensource-src (5.5.1+dfsg-6ubuntu1) xenial; urgency=medium

  * New upstream release. (LP: #1437206) (LP: #1450137) (LP: #1474313)
(LP: #1470700) (LP: #1504631) (LP: #1423659) (LP: #1474775) (LP: #1508945)
  * Replace load_testability_from_env_var.patch with upstreamed
Add-environment-variable-support-for-testability-lib.patch
  * Drop patches in upstream:
- Correct-typo-in-the-Gujarati-openType-identififer.patch
  * Rebase enable-tests.patch. Disable one failing QtWidgets test.
  * Build depend on GStreamer 1.0 and add a configure option for it.
  * Update symbols.
  * Mark/unmark private symbols.
  * Replace two Ubuntu patches with upstreamed patches:
- Drop disable-generic-plugin-when-others-available.patch, replace with
  Add-an-option-to-skip-the-generic-bearer-engine.patch
- Drop qopenglframebufferobject_powervrworkaround.patch, replace with
  Blacklist-PowerVR-Rogue-G6200-v1.3-from-supporting-B.patch
  * debian/patches/Make-sure-networkAccessibilityChanged-is-emitted.patch:
- Include a network fix from Qt 5.5 branch (merged after 5.5.1)
  (LP: #1470700)
  * debian/patches/Use-Node-name-if-Node-logicalModuleName-is-empty-for.patch:
- Fix a qdoc issue (LP: #1447182)
  * Remove disable_overlay_scrollbars.diff as overlay scrollbars were dropped.
  * debian/patches/Prefer-QT_PLUGIN_PATH-over-compiled-in-paths.patch:
- Backport. Prefer QT_PLUGIN_PATH over compiled-in paths (LP: #1519927)
  * debian/patches/Fix-crash-on-exit-caused-by-QStringLiterals.patch
- Backport. Fix a crasher on exit (LP: #1436973)
  * Replace our workaround for font rendering with new backported upstream
patches:
- Add debian/patches/Fix-falsely-reported-style-for-fallback-font.patch
- Add 
debian/patches/Remove-historical-4-padding-in-QFontEngine-alphaMapF.patch
- Remove debian/patches/enable_fonts_always_smoothly.patch
  (LP: #1475205)

 -- Timo Jyrinki   Tue, 01 Dec 2015 06:16:35
+

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Timo Jyrinki]

FWIW, the screen switching problems are quite spread to a lot of smaller
bugs, which explains why Qt 5.4.2 did not fix everything.

For example, these bugs exist in upstream tracker:
https://bugreports.qt.io/browse/QTBUG-46024
https://bugreports.qt.io/browse/QTBUG-42985
https://bugreports.qt.io/browse/QTBUG-47041

A lot of rework to the code in question has happened in Qt 5.5, and now
5.5.1. Qt 5.5.1 is not yet released, but will be targeted to land to
Ubuntu after 15.10 release.

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Czikus]

Still getting krunner crashes when switching screens on Willy with Qt.
5.4.2.

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Timo Jyrinki]

Hi Nuno,

Qt 5.4.2 is not just a small bugfix release, so it does not fall under
Stable Release Updates guidelines
(https://wiki.ubuntu.com/StableReleaseUpdates).

So unfortunately I don't think the bug is going to be fixed there unless
someone identifies the exact patches needed to fix the issue without
risking regressions elsewhere.

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Nuno Carvalho]

Hi Timo,

Any chance 5.4.2 is backported to vivid?
It is good that the bug is fixed on 15.10, but for the last released version 
(15.04) the bug is still there.

Best regards,
Nuno Carvalho

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Marco Cimmino]

I cannot use Willy at the moment, but some other user on Arch Linux found out 
that the workaround in Qt 5.4.2 isn't fixing all crashes, I hope someone can 
confirm this.
https://bugs.archlinux.org/task/43986

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Arne Henningsen]

I guess that this is the same bug as:

https://bugs.kde.org/show_bug.cgi?id=349197

A developer at bugs.kde.org claims that this bug was fixed in Qt version
5.4.2 and I got the advice to upgrade from Qt version 5.4.1 to version
5.4.2. Is there a PPA with Qt 5.4.2 for (K)Ubuntu 15.04 or another easy
(and low-risk) way to upgrade Qt to version 5.4.2?


** Bug watch added: KDE Bug Tracking System #349197
   https://bugs.kde.org/show_bug.cgi?id=349197

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Timo Jyrinki]

s/in the bug report/in the changelog/

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Timo Jyrinki]

Unfortunately there's no Qt 5.4.2 PPA for 15.04, and no backportable
commits have been found that would actually fix the problem.

However, as of an hour ago 15.10 now has Qt 5.4.2, so marking this bug
as fixed even though the bug number was not included in the bug report.
Testing whether Qt 5.4.2 actually fixed the problem in wily would be
welcome.

---

qtbase-opensource-src (5.4.2+dfsg-2ubuntu1) wily; urgency=medium

  * New upstream release.
  * Drop additional cherry-picked patches now included:
- make-sure-there-s-a-scene.patch
- upstream-gerrit_Handle-SelectionWindowDestroy-in-QXcbClipboard.patch
- upstream_Call-ofono-nm-Registered-delayed-in-constructor-othe.patch
- upstream_xcb-Update-mouse-buttons-from-MotionNotify-events.patch
- upstream_xcb_use_themed_cursor.patch
- enable_pie.patch
  * Bump ABI:s in symbols files
  * Update symbols from build logs.

 -- Timo Jyrinki timo-jyri...@ubuntu.com  Wed, 10 Jun 2015 11:45:56
+

** Changed in: qtdeclarative-opensource-src (Ubuntu Wily)
   Status: Confirmed = Fix Released

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Timo Jyrinki]

Silo 002 with the not so complete fix was no freed to be reused for
other purposes. I made a backup of the package to https://launchpad.net
/~timo-jyrinki/+archive/ubuntu/ppa/+packages though.

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Timo Jyrinki]

Yes, you're correct even though I meant the (positive) impact of landing
the current fix being low :)

I agree about canceling the SRU at least for now. Qt 5.5 will have the
fix in wily eventually, but if there's something to be done with the 5.4
series that seriously improves the situation we can come back to
considering vivid.

Qt 5.5 alpha for vivid is partially at https://launchpad.net/~ci-train-
ppa-service/+archive/ubuntu/landing-012/ but not enough to run Plasma 5
(Unity 8 ok). I'll build beta just being released for wily in the same
PPA.

** No longer affects: qtdeclarative-opensource-src (Ubuntu Vivid)

** Changed in: qtdeclarative-opensource-src (Ubuntu Wily)
   Status: Incomplete = Confirmed

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Timo Jyrinki]

The bug https://bugs.kde.org/show_bug.cgi?id=345544 linked from
https://bugreports.qt.io/browse/QTBUG-45753 (linked from
https://codereview.qt-project.org/#/c/00/) has a claim from Stefan
that he doesn't see a particular crash anymore with Fedora's patched Qt.
The only relevant patch in that Fedora qtdeclarative seems to be this
same patch, so can maybe someone try to reproduce the crasher described
in that bug and then confirm it'd be fixed by the PPA?

That we way we could get at least one crasher fix in for starters.

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Antonis Kanouras]

I managed to get backtraces out of Konsole  Plasma, excuse the poor
quality of them as I only remembered to log output after I started gdb.

In all 3 cases they're now crashing in QScreen::handle() with
(this=this@entry=0x0) .

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Antonis Kanouras]

** Attachment added: Konsole crash backtrace with patched Qt
   
https://bugs.launchpad.net/ubuntu/+source/qtdeclarative-opensource-src/+bug/1450137/+attachment/4396144/+files/konsole.qtdeclarative_ubuntu8.crash

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Antonis Kanouras]

** Attachment added: Plasmashell crash backtrace with patched Qt
   
https://bugs.launchpad.net/ubuntu/+source/qtdeclarative-opensource-src/+bug/1450137/+attachment/4396143/+files/plasmashell.qtdeclarative_ubuntu8.crash

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Antonis Kanouras]

Re: the impact, I guess it affects users on laptops that regularly
(dis)connect external screens (eg. using same laptop at work  home or
connecting the laptop to a TV to watch a movie) without shutting down
the machine. From the few (10) Kubuntu 15.04 installations I can be
blamed for, I'm the only one who noticed the bug even though I managed
to reproduce it on all of them.

Anyway, after reading the qtbugs and trying to cherry-pick a few
relevant upstream commits, I think Qt 5.4.1 is a lost cause for this bug
at this point, so feel free to postpone/cancel this SRU.

As my next steps, I'll try Fedora, and also 5.4.2  5.5 on Vivid  Wily
to see if I can reproduce it. Will take a few days however. :/

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Timo Jyrinki]

I think it starts to sound like it would be useful to land this fix in
wily to get also more exposure to the fix, but maybe not worth starting
an SRU at this point. The impact seems to be either a) low or b) a bit
unpredictable on the actual problem users are seeing. If it turns out we
can get also other fixes landed to wily and they together would have a
bigger improvement, the SRU could be considered later?

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Antonis Kanouras]

I did a few tests:

On the first reboot after installing qtdeclarative from the Wily PPA on
Vivid, I probably got lucky and managed to plug/unplug the external
monitor 4 times before the first crash (nvidia-340's xrandr also stopped
detecting changes for the next 2 topology changes at that point,
although that's nothing new).

On subsequent reboots I'm getting Plasma/Kwin/Konsole crashes on almost every 
screen change. 
Some changes in behaviour that I noticed:

1. Dr. Konqi is started for kwin crashes, but no window appears (no mention of 
it in xlsclients either).
2. Dr. Konqi is not started for plasmashell crashes (crashes on almost every 
screen change).
3. Dr. Konqi is not started for Konsole crashes (crashes on every screen 
change).
4. krunner does not crash on screen change - it crashes instead when called 
with Alt+F2, with Dr. Konqi appearing. It doesn't allow me to report krunner 
crashes by the way, but that's another bug. The backtrace (which I'm attaching) 
is different this time, there's no physicalSize() in it. Luckily it's restarted 
right after usually, so there's a way to recover manually.
5. System Settings 5 also usually crashes around screen changes; that's caught 
by apport however, which gives me zero information.
6. Usually after a crash, the Plasma panel flickers, with only the spacer being 
displayed when not flickering, and can't be clicked. Disabling composition with 
the shortcut works around this.

All in all, I'd say the behaviour has improved a bit, as regards the
frequency of crashes; however, losing Dr. Konqi is mildly disappointing.

I have to apologise here for jumping on this patch without having tested
it myself first. I'll try pre-attaching gdb to kwin/plasmashell/konsole
to get backtraces out of them, and a Fedora install in the next days to
see if the crashes are really fixed, at least on my machine, and report
back.

** Attachment added: New krunner backtrace
   
https://bugs.launchpad.net/ubuntu/+source/qtdeclarative-opensource-src/+bug/1450137/+attachment/4396120/+files/krunner-20150511-231019_xrandr%2Bqtdeclarative_ubuntu8.kcrash.txt

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Timo Jyrinki]

** Changed in: qtdeclarative-opensource-src (Ubuntu Wily)
   Status: Confirmed = In Progress

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Timo Jyrinki]

Can anyone test on wily (or just add the PPA for wily on vivid) with the
5.4.1-1ubuntu8 version from https://launchpad.net/~ci-train-ppa-
service/+archive/ubuntu/landing-002 ?

I still get a crash of Qt Creator when plugging/unplugging with the
patch included. Does it improve the situation for anyone?

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Timo Jyrinki]

** Changed in: qtdeclarative-opensource-src (Ubuntu Wily)
   Status: In Progress = Incomplete

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Harald Sitter]

Tried it, doesn't fix plasmashell exploding (not in the particular test case 
presented anyway). A bit of research suggests that this type of issue has 
multiple causes and is in fact only fixed by a combination of multiple commits 
(see the code review tabs on the bug reports below).
The last bug in particular seems to carry the majority of relevant patches.

https://bugreports.qt.io/browse/QTBUG-32973
https://bugreports.qt.io/browse/QTBUG-32681
https://bugreports.qt.io/browse/QTBUG-42985

I am not sure how to proceed on this. The additional patches seem to
only affect qxcb such that they could only regress !phone apps (e.g.
kubuntu-desktop). They are however numerous making this more work and
more likely to cause regressions in other parts.

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Harald Sitter]

** No longer affects: plasma-workspace (Ubuntu)

** No longer affects: kwin (Ubuntu)

** Package changed: qtbase-opensource-src (Ubuntu) = qtdeclarative-
opensource-src (Ubuntu)

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Antonis Kanouras]

This has affected all Plasma 5 releases in Kubuntu since Utopic,
including the current backport of Plasma 5.3.

It reliably triggers a cascade of crashes in at least krunner, plasma
and kwin on every screen topology change, making for a very
disconcerting user experience.

Please consider cherry-picking https://codereview.qt-
project.org/#/c/00/ for Qt  5.4.2, Fedora and OpenSUSE have already
done so.

You can find more details in https://bugs.kde.org/show_bug.cgi?id=345544
.

** Bug watch added: KDE Bug Tracking System #345544
   https://bugs.kde.org/show_bug.cgi?id=345544

** Also affects: plasma-workspace (Ubuntu)
   Importance: Undecided
   Status: New

** Also affects: kwin (Ubuntu)
   Importance: Undecided
   Status: New

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Launchpad Bug Tracker]

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

** Changed in: qtbase-opensource-src (Ubuntu)
   Status: New = Confirmed

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Title:
  Qt5 applications crash when switching screens

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Timo Jyrinki]

There's another qtdeclarative landing pending to go to wily. Then this'd
go into wily, and then a backport of this to vivid. It will take some
time.

** Also affects: qtdeclarative-opensource-src (Ubuntu Vivid)
   Importance: Undecided
   Status: New

** Changed in: qtdeclarative-opensource-src (Ubuntu Vivid)
   Status: New = Confirmed

** Changed in: qtdeclarative-opensource-src (Ubuntu)
 Assignee: (unassigned) = Timo Jyrinki (timo-jyrinki)

** Changed in: qtdeclarative-opensource-src (Ubuntu)
   Importance: Undecided = Medium

** Changed in: qtdeclarative-opensource-src (Ubuntu Vivid)
   Importance: Undecided = Medium

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https://bugs.launchpad.net/bugs/1450137

Title:
  Qt5 applications crash when switching screens

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[Bug 1450137] Re: Qt5 applications crash when switching screens

[Harald Sitter]

** Description changed:

+ # Impact
+ When switching screens (e. g. when putting the laptop onto the docking 
station the notebook screen is turned off and the external one is turned on) 
Qt5 applications (including plasmashell) quite often crash.
+ 
+ # Test Case
+ * Have two screens. One plugged-in one not
+ * Run plasma 5
+ * Plug-in second screen and wait 10 seconds
+ * Unplug and wait 10 seconds
+ * Plug-in and wait 10 seconds
+ * Unplug and wait 10 seconds
+ * ...
+ 
+ # Regression Potential
+ Worst case scenario an application using qquickscreen would slow down because 
of erroneous screen change singals being emitted too often per second. This 
would however only reveal a lower level issue in the foundations that 
ultimately needs to be fixed anyway. 
+ 
+ # Other Info
+ The upstream code review [1] explains the issue and solution pretty well.
+ 
+ https://codereview.qt-project.org/#/c/00/
+ 
+ 
+ - original report ---
+ 
  When switching screens (e. g. when putting the laptop onto the docking
  station the notebook screen is turned off and the external one is turned
  on) Qt5 applications (including plasmashell) quite often crash. This
  makes my laptop unusable, since I do that very frequently.
  
  The problem has already been described here: 
https://bugs.kde.org/show_bug.cgi?id=341497
  Apparently it is fixed in Qt 5.5
  
  I am running Kubuntu 15.04 64bit and libqt5gui5 5.4.1+dfsg-2ubuntu4.

** Also affects: qtdeclarative-opensource-src (Ubuntu Wily)
   Importance: Medium
 Assignee: Timo Jyrinki (timo-jyrinki)
   Status: Confirmed

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Title:
  Qt5 applications crash when switching screens

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