403042 2019-01-09 16:06:15 +0000 Qt5 from KDE 5.12 runtime requires Linux kernel >= 3.17 2019-01-10 08:05:52 +0000 1 1 8 I don't know kde general unspecified Flatpak Linux RESOLVED FIXED https://github.com/flathub/flathub/issues/805 regression NOR critical --- 0 scx.mail unassigned-bugs-null aleixpol scx.mail 0 oldest_to_newest 1831236 0 scx.mail 2019-01-09 16:06:15 +0000 It seems that Qt5 from KDE 5.12 requires Linux kernel >= *3.17*. https://github.com/flathub/flathub/issues/805 ``` > $ flatpak run --command=file org.kde.Sdk//5.11 -L /usr/lib/libQt5Core.so.5 > /usr/lib/libQt5Core.so.5: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-x86-64.so.2, for GNU/Linux 2.6.28, BuildID[sha1]=55f0af0db424e36d4747078c3983937f41761d75, stripped ``` ``` > $ flatpak run --command=file org.kde.Sdk//5.12 -L /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 > /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: ELF 64-bit LSB pie executable x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=343152921fe7eb79af20efb2f735659b0982991b, for GNU/Linux 3.17.0, stripped ``` According to the minimum-linux_p.h, it is probably because Qt started using the `getrandom` syscall which was introduced in Linux *3.17*. https://code.qt.io/cgit/qt/qtbase.git/tree/src/corelib/global/minimum-linux_p.h?id=4d9ac14bf8d1c1a33a2720c7f7dcaf8d912a592f#n77 It is possible build Qt without the `getentropy` feature and that would lower the required kernel version to *3.16*. Disabling `renameat2` will further reduce the requirements to *2.6.28*. As you can see, it is possible to build Qt 5.12 against older kernel (RHEL 7.6, Devtoolset 7): ``` > $ file lib/libQt5Core.so.5.12.0 > lib/libQt5Core.so.5.12.0: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.28, BuildID[sha1]=acde2ce7459f76f3edae7e4caa75230fe0fbaad9, not stripped ``` See also: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=895718#51 https://forum.critterandguitari.com/t/problems-with-qt/2246/9 Anyway, this means that on systems with the older kernel, you can't neither build nor run Qt5-based applications. We're still talking about the KDE 5.12 runtime, of course. Examples of build failures: ``` > /cfgtest_QtCore: error while loading shared libraries: libQt5Core.so.5: cannot open shared object file: No such file or directory ``` ``` > /usr/bin/lrelease: error while loading shared libraries: libQt5Core.so.5: cannot open shared object file: No such file or directory ``` Examples of run failures: ``` > $ flatpak run org.pencil2d.Pencil2D > bwrap: Can't mkdir /usr/lib/sdk: Read-only file system > error: ldconfig failed, exit status 256 ``` ``` > $ flatpak run org.olivevideoeditor.Olive > bwrap: Can't mkdir /usr/lib/sdk: Read-only file system > error: ldconfig failed, exit status 256 ``` ``` > $ flatpak run org.bunkus.mkvtoolnix-gui > bwrap: Can't mkdir /usr/lib/sdk: Read-only file system > error: ldconfig failed, exit status 256 ``` List of affected systems: * EL 7 (Red Hat Enterprise Linux 7, CentOS 7, Scientific Linux 7, Oracle Linux 7 with the Red Hat compatible kernel) - End Of Life: 2024-06 * Debian 8 (oldstable) - End Of Life: 2020-05 * Ubuntu 14.04 LTS - End Of Life: 2019-04 Currently affected apps from Flathub repo: * org.bunkus.mkvtoolnix-gui - https://github.com/flathub/flathub/pull/533 * org.olivevideoeditor.Olive - https://github.com/flathub/flathub/pull/794 * org.pencil2d.Pencil2D - https://github.com/flathub/flathub/pull/527 ``` > $ grep -HERi 'runtime-version.*5\.12' * > org.bunkus.mkvtoolnix-gui/org.bunkus.mkvtoolnix-gui.yaml:runtime-version: '5.12' > org.kde.KStyle.Adwaita/org.kde.KStyle.Adwaita.json: "runtime-version": "5.12", > org.kde.KStyle.HighContrast/org.kde.KStyle.HighContrast.json: "runtime-version": "5.12", > org.kde.PlatformTheme.QGnomePlatform/org.kde.PlatformTheme.QGnomePlatform.json: "runtime-version": "5.12", > org.olivevideoeditor.Olive/org.olivevideoeditor.Olive.yaml:runtime-version: '5.12' > org.pencil2d.Pencil2D/org.pencil2d.Pencil2D.yaml:runtime-version: '5.12' ``` What is worse, this problem affects all applications from the KDE repository. https://phabricator.kde.org/source/flatpak-kde-applications I would like to ask you to rebuild KDE 5.12 against Linux <= 3.2. https://phabricator.kde.org/source/flatpak-kde-runtime There is already an idea to document and verify allowed kernel dependencies, in particular for runtimes. https://github.com/flatpak/flatpak/issues/2551#issuecomment-452697898 Please keep in mind that Freedesktop 18.08 (on which KDE 5.12 is based) contains glibc 2.27, so it requires at least Linux *3.2*, but it shouldn't be a problem. On the other hand, Freedesktop 1.6 uses glibc 2.24, which requires kernel *2.6.32*, at least for i686 and x86_64. https://www.sourceware.org/ml/libc-alpha/2016-08/msg00212.html > The GNU C Library version 2.24 is now available > (...) > The minimum Linux kernel version that this version of the GNU C Library can be used with is 3.2, except on i[4567]86 and x86_64, where Linux kernel version 2.6.32 or later suffices (on architectures that already required kernel versions more recent than 3.2, those requirements remain unchanged). https://sourceware.org/ml/libc-alpha/2017-08/msg00010.html > The GNU C Library version 2.26 is now available > (...) > Linux kernel 3.2 or later is required at runtime, on all architectures supported by that kernel. (This is a change from version 2.25 only for x86-32 and x86-64.) See also: https://github.com/flathub/flathub/issues/805 https://github.com/flatpak/flatpak/issues/2551 https://github.com/flathub/net.ankiweb.Anki/pull/19#issuecomment-451034931 https://github.com/flathub/net.ankiweb.Anki/pull/19#issuecomment-452248896 https://github.com/KDE/flatpak-kde-runtime/pull/5 1831272 1 aleixpol 2019-01-09 18:43:49 +0000 Should be fixed as of https://phabricator.kde.org/R257:a029f2957e947f6e32fe8a595edb0ac553654e90 1831328 2 scx.mail 2019-01-10 08:05:52 +0000 It seems that it has been fixed. Before: ``` > $ flatpak run --command=bash org.kde.Sdk//5.12 -c 'find / -xtype f -executable 2>/dev/null | xargs -I{} file -L "{}" | grep "for GNU/Linux" ' | grep -Ev '3\.2\.0' > /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: ELF 64-bit LSB pie executable x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=343152921fe7eb79af20efb2f735659b0982991b, for GNU/Linux 3.17.0, stripped > /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.12.0: ELF 64-bit LSB pie executable x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=343152921fe7eb79af20efb2f735659b0982991b, for GNU/Linux 3.17.0, stripped > /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.12: ELF 64-bit LSB pie executable x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=343152921fe7eb79af20efb2f735659b0982991b, for GNU/Linux 3.17.0, stripped > /usr/lib/x86_64-linux-gnu/libQt5Core.so: ELF 64-bit LSB pie executable x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=343152921fe7eb79af20efb2f735659b0982991b, for GNU/Linux 3.17.0, stripped ``` After: ``` > $ flatpak run --command=bash org.kde.Sdk//5.12 -c 'find / -xtype f -executable 2>/dev/null | xargs -I{} file -L "{}" | grep "for GNU/Linux" ' | grep -Ev '3\.2\.0' > /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: ELF 64-bit LSB pie executable x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=d4b2645839fd05656f1a7c5f7f9c5bf5965dddce, for GNU/Linux 2.6.28, stripped > /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.12.0: ELF 64-bit LSB pie executable x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=d4b2645839fd05656f1a7c5f7f9c5bf5965dddce, for GNU/Linux 2.6.28, stripped > /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.12: ELF 64-bit LSB pie executable x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=d4b2645839fd05656f1a7c5f7f9c5bf5965dddce, for GNU/Linux 2.6.28, stripped > /usr/lib/x86_64-linux-gnu/libQt5Core.so: ELF 64-bit LSB pie executable x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=d4b2645839fd05656f1a7c5f7f9c5bf5965dddce, for GNU/Linux 2.6.28, stripped ```