[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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Title:
  Qt5 applications crash when switching screens

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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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  Qt5 applications crash when switching screens

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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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  Qt5 applications crash when switching screens

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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]

s/in the bug report/in the changelog/

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  Qt5 applications crash when switching screens

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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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  Qt5 applications crash when switching screens

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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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  Qt5 applications crash when switching screens

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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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  Qt5 applications crash when switching screens

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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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  Qt5 applications crash when switching screens

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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]

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

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  Qt5 applications crash when switching screens

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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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  Qt5 applications crash when switching screens

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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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  Qt5 applications crash when switching screens

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