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ecko
Tux's lil' helper
Joined: 04 Jul 2010
Posts: 107
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 Posted: Sun Sep 15, 2024 9:59 pm Post subject: [SOLVED] infinite loop in qt5 File Open or Save As dialog |
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For a month or two, whenever I open a qt5 application, File/Open and File/Save As dialogs hang on 100% (1 core) without any other option than killing the process.
For example it hangs designer5 but not designer6 (dev-qt/designer-5.15.14 vs. dev-qt/qttools-6.7.2)
It affects every qt5 application: cantor, kig, librecad, libreoffice[USE=kde], klayout, avidemux
but not those ported to qt6: spectacle, kwrite, freecad
Any idea of what I could do to get useful traces for the issue? When launching any of those under strace, there is no output during the hanging.
Last edited by ecko on Tue Sep 17, 2024 6:47 am; edited 2 times in total |
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asturm
Developer
Joined: 05 Apr 2007
Posts: 9270
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| Posted: Mon Sep 16, 2024 7:16 am Post subject: |
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| What desktop environment, X11 or Wayland session, are you in? systemd or elogind? |
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ecko
Tux's lil' helper
Joined: 04 Jul 2010
Posts: 107
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| Posted: Mon Sep 16, 2024 8:19 am Post subject: |
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I use X11, fluxbox, elogind
Additional tests:
- added "USE=debug" to qtcore, qtgui, qtwidgets. No particular useful output. Consistently using gcc-14.2.1_p20240817
- played with qt5ct just in case the appearance (oxygen/breeze) would be a problem
- upgraded to latest kernel (gentoo-sources-6.11.0)
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ecko
Tux's lil' helper
Joined: 04 Jul 2010
Posts: 107
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| Posted: Tue Sep 17, 2024 12:06 am Post subject: |
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strace designer5 → the last thing it does before hanging is opening fonts. Though I don't know why it wants to open urw-fonts, qt5ct is configured to use Adobe Source Sans 3.
| Code: | openat(AT_FDCWD, "/usr/share/fonts/urw-fonts/D050000L.ttf", O_RDONLY) = 15
fcntl(15, F_SETFD, FD_CLOEXEC) = 0
fstat(15, {st_mode=S_IFREG|0644, st_size=37860, ...}) = 0
mmap(NULL, 37860, PROT_READ, MAP_PRIVATE, 15, 0) = 0x7f91dfe20000
close(15) = 0
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After recompiling for debug (FEATURES="keeptemp keepwork installsources nostrip" CFLAGS="-Og -ggdb3 -pipe" USE="debug")
| Code: | gdb -r kig
run
CTRL-C
backtrace
#0 0x00007ffff2028e8d in FcValueCanonicalize (v=v@entry=0x555555989fc8) at ../fontconfig-2.14.2/src/fcpat.c:73
#1 0x00007ffff202a21e in FcPatternObjectGetWithBinding (p=p@entry=0x555555981170, object=<optimized out>, id=id@entry=0, v=v@entry=0x7fffffffa050, b=b@entry=0x0) at ../fontconfig-2.14.2/src/fcpat.c:966
#2 0x00007ffff202a2f9 in IA__FcPatternGet (p=0x555555981170, object=<optimized out>, id=0, v=v@entry=0x7fffffffa050) at ../fontconfig-2.14.2/src/fcpat.c:991
#3 0x00007ffff202a5b0 in IA__FcPatternGetCharSet (p=<optimized out>, object=<optimized out>, id=<optimized out>, c=0x7fffffffa080) at ../fontconfig-2.14.2/src/fcpat.c:1116
#4 0x00007ffff210e93e in QFontEngineMultiFontConfig::shouldLoadFontEngineForCharacter(int, unsigned int) const () from /usr/lib64/libQt5XcbQpa.so.5
#5 0x00007ffff6be32fc in QFontEngineMulti::stringToCMap(QChar const*, int, QGlyphLayout*, int*, QFlags<QFontEngine::ShaperFlag>) const () from /usr/lib64/libQt5Gui.so.5
#6 0x00007ffff6c062c8 in QTextEngine::shapeText(int) const () from /usr/lib64/libQt5Gui.so.5
#7 0x00007ffff6c1a6c1 in QTextLine::layout_helper(int) () from /usr/lib64/libQt5Gui.so.5
#8 0x00007ffff739ab4b in viewItemTextLayout(QTextLayout&, int, int, int*) () from /usr/lib64/libQt5Widgets.so.5
...
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I try with media-libs/fontconfig-2.14.2-r3 and -2.15.0, same result
If I temporarily rename /usr/share/fonts/urw-fonts, it still gets lost in qt font management
| Code: | #0 0x00007ffff210e942 in QFontEngineMultiFontConfig::shouldLoadFontEngineForCharacter(int, unsigned int) const () from /usr/lib64/libQt5XcbQpa.so.5
#1 0x00007ffff6be32fc in QFontEngineMulti::stringToCMap(QChar const*, int, QGlyphLayout*, int*, QFlags<QFontEngine::ShaperFlag>) const () from /usr/lib64/libQt5Gui.so.5
#2 0x00007ffff6c062c8 in QTextEngine::shapeText(int) const () from /usr/lib64/libQt5Gui.so.5
#3 0x00007ffff6c1a6c1 in QTextLine::layout_helper(int) () from /usr/lib64/libQt5Gui.so.5
#4 0x00007ffff739ab4b in viewItemTextLayout(QTextLayout&, int, int, int*) () from /usr/lib64/libQt5Widgets.so.5
#5 0x00007ffff739ef7c in QCommonStylePrivate::viewItemSize(QStyleOptionViewItem const*, int) const () from /usr/lib64/libQt5Widgets.so.5
...
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Is there a way I can reset the qt font system? |
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ecko
Tux's lil' helper
Joined: 04 Jul 2010
Posts: 107
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| Posted: Tue Sep 17, 2024 6:46 am Post subject: |
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| I found the problem. ~/.config/QtProject.conf was corrupt. I deleted it, all good. |
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