Bug#952901: shotcut: Segmentation fault on 4K monitor
Package: shotcut
Version: 20.02.17-2
Severity: important
Dear Maintainer,
When I try to run shotcut on a 4K monitor I get the following logs:
$ LANG=C shotcut
[Info ] <Application::Application> Starting Shotcut version 20.02.21
[Info ] <Application::Application> Linux version
[Info ] <Application::Application> number of logical cores = 8
[Info ] <Application::Application> locale = QLocale(C, Default, Default)
[Info ] <Application::Application> install dir = "/usr/bin"
[Info ] <Application::Application> device pixel ratio = 2
[Debug ] <ShotcutSettings::log> language "C"
[Debug ] <ShotcutSettings::log> deinterlacer "onefield"
[Debug ] <ShotcutSettings::log> external monitor ""
[Debug ] <ShotcutSettings::log> GPU processing true
[Debug ] <ShotcutSettings::log> interpolation "bilinear"
[Debug ] <ShotcutSettings::log> video mode ""
[Debug ] <ShotcutSettings::log> realtime true
[Debug ] <ShotcutSettings::log> audio channels 2
No appenders associated with category qt.qpa.xcb
[Warning] <> xcb_shm_create_segment() can't be called for size 17178820624, maximumallowed size is 4294967295
zsh: segmentation fault LANG=C shotcut
And here's an extract of a more verbose log:
$ QT_LOGGING_RULES='*.debug=true' shotcut
...
[Debug ] <> [ QWidgetWindow(0x55c4be7b5c20, name="QSplashScreenClassWindow") ] creating shared memory 17178820624 bytes for QSize(65534, 65534) depth 32 bits 32
No appenders associated with category qt.qpa.xcb
[Warning] <> xcb_shm_create_segment() can't be called for size 17178820624, maximumallowed size is 4294967295
No appenders associated with category qt.scaling
[Debug ] <> QBackingStore::beginPaint new backingstore for QWidgetWindow(0x55c4be7b5c20, name="QSplashScreenClassWindow")
No appenders associated with category qt.scaling
[Debug ] <> source size QSize(65534, 65534) dpr 1
No appenders associated with category qt.scaling
[Debug ] <> destination size QSize(65534, 65534) dpr 2
...
And finally is an extract of the output of xrandr:
$ xrandr -q | head
Screen 0: minimum 8 x 8, current 3840 x 2160, maximum 32767 x 32767
HDMI-0 disconnected primary (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
eDP-1-1 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 346mm x 194mm
3840x2160 60.00*+ 59.98 48.02 59.97
3200x1800 59.96 59.94
2880x1620 59.96 59.97
2560x1600 59.99 59.97
2560x1440 59.99 59.99 59.96 59.95
It looks like Qt tries to allocate some memory for the splash screen,
but with a size that's so large it doesn't really make sens.
Note that the requested amount of memory is exactly 65534*65534*4. And
this size is exactly twice the maximum screen size: 32767*32767. The
screen size is not an exact power of two, so this would be an odd
coincidence.
I don't know if the bug is rather in shotcut or in Qt. Or maybe in the
way they interact. Feel free to reassign this bug report if needs be.
Best regards,
Celelibi
-- System Information:
Debian Release: bullseye/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable-debug'), (500, 'unstable'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 5.4.0-4-amd64 (SMP w/8 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages shotcut depends on:
ii libc6 2.29-10
ii libgcc-s1 10-20200222-1
ii libjs-three 111+dfsg1-1
ii libmlt++3 6.20.0-1
ii libmlt6 6.20.0-1
ii libqt5core5a 5.12.5+dfsg-8
ii libqt5gui5 5.12.5+dfsg-8
ii libqt5multimedia5 5.12.5-1+b1
ii libqt5network5 5.12.5+dfsg-8
ii libqt5opengl5 5.12.5+dfsg-8
ii libqt5qml5 5.12.5-5
ii libqt5quick5 5.12.5-5
ii libqt5quickwidgets5 5.12.5-5
ii libqt5sql5 5.12.5+dfsg-8
ii libqt5webkit5 5.212.0~alpha3-7
ii libqt5websockets5 5.12.5-2+b1
ii libqt5widgets5 5.12.5+dfsg-8
ii libqt5xml5 5.12.5+dfsg-8
ii libstdc++6 10-20200222-1
ii melt 6.20.0-1
ii qml-module-qtgraphicaleffects 5.12.5-2+b1
ii qml-module-qtqml-models2 5.12.5-5
ii qml-module-qtquick-controls 5.12.5-1+b1
ii qml-module-qtquick-controls2 5.12.5+dfsg-2+b1
ii qml-module-qtquick-dialogs 5.12.5-1+b1
ii qml-module-qtquick-extras 5.12.5-1+b1
ii qml-module-qtquick-layouts 5.12.5-5
ii qml-module-qtquick-window2 5.12.5-5
ii qml-module-qtquick2 5.12.5-5
shotcut recommends no packages.
shotcut suggests no packages.
-- no debconf information
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