Qt Designer crashes on startup

Raptorista · 2011-08-15 08:05:42

Good morning everybody!
I recently started studying Qt4 and PyQt4 GUI programming, and I found the application QtDesigner very useful in my experimenting.
Out-of-the-box [right after Arch's install] QtDesigner didn't work properly, for it sistematically segfaulted whenever I tried to save a GUI, but then I read that renaming the file /usr/lib/kde4/plugins/designer/kdewidgets.so could fix the problem, and that's what I did.

Afterwards, I've been able to use it with no issues, but now something happened and it's not working anymore: if I try to launch it in the terminal, I get a verbose output whose main line should be

*** glibc detected *** designer: double free or corruption (out): 0x0000000002360110 ***

I'd report it completely if necessary.

Before it broke, here's all I did on my computer:

pacman -Syu
Installed Spyder, a Python IDE which contains a link to QtDesigner; I also successfully ran QtDesigner from inside Spyder

Maybe one of thse is the cause?
What could I do?

Thanks in advance for any help!

George · 2011-08-15 14:55:03

Are you using KDE? Have you tried renaming the kdewidgets.so file back to its original name, or has it reappeared due to a designer update?

Raptorista · 2011-08-15 15:40:12

Yes, I'm ok KDE.
I tried renaming back the kdewidgets.so file but now I get a segfault at launch.

George · 2011-08-15 15:55:20

Hmm, well I'm also using QtDesigner in kde without renaming the kdewidgets.so file and it works fine for me... are you using anything from [testing]?
Could you try running QtDesigner in gdb so you can get a backtrace when it segfauts.

Last edited by George (2011-08-15 15:55:51)

kachelaqa · 2011-08-15 17:44:21

Raptorista wrote:

Good morning everybody!
I recently started studying Qt4 and PyQt4 GUI programming, and I found the application QtDesigner very useful in my experimenting.
Out-of-the-box [right after Arch's install] QtDesigner didn't work properly, for it sistematically segfaulted whenever I tried to save a GUI, but then I read that renaming the file /usr/lib/kde4/plugins/designer/kdewidgets.so could fix the problem, and that's what I did.

yes, that is an issue with the open/saveas dialog reported here: https://bugs.archlinux.org/task/24916

Afterwards, I've been able to use it with no issues, but now something happened and it's not working anymore: if I try to launch it in the terminal, I get a verbose output whose main line should be
*** glibc detected *** designer: double free or corruption (out): 0x0000000002360110 *** 
I'd report it completely if necessary.
Before it broke, here's all I did on my computer:
pacman -Syu
Installed Spyder, a Python IDE which contains a link to QtDesigner; I also successfully ran QtDesigner from inside Spyder
Maybe one of thse is the cause?
What could I do?
Thanks in advance for any help!

i use designer quite a lot, but i've never seen the problem you describe here.

it might be useful if you posted the full output you get after trying to launch designer in a terminal.

Raptorista · 2011-08-17 11:01:05

Sure! Here it is:

~]$ designer
Application asked to unregister timer 0xe000003 which is not registered in this thread. Fix application.
Application asked to unregister timer 0x12000002 which is not registered in this thread. Fix application.
*** glibc detected *** designer: double free or corruption (out): 0x000000000174ddf0 ***
======= Backtrace: =========
/lib/libc.so.6(+0x7366a)[0x7f966e47d66a]
/lib/libc.so.6(cfree+0x6c)[0x7f966e48154c]
/usr/lib/libQtCore.so.4(_ZN14QObjectPrivate14deleteChildrenEv+0x85)[0x7f966edf76b5]
/usr/lib/libQtGui.so.4(_ZN7QWidgetD1Ev+0x27a)[0x7f966f648ada]
/usr/lib/libqwt.so.6(_ZN7QwtPlotD0Ev+0x9)[0x7f965ed5db19]
/usr/lib/libQtDesigner.so.4(_ZN18qdesigner_internal14WidgetDataBase21defaultPropertyValuesERK7QString+0x143)[0x7f967059db23]
/usr/lib/libQtDesigner.so.4(_ZN18qdesigner_internal14WidgetDataBase25grabDefaultPropertyValuesEv+0x6e)[0x7f967059de8e]
designer[0x430270]
designer[0x4298c5]
designer[0x429e7a]
designer[0x4166c3]
/lib/libc.so.6(__libc_start_main+0xed)[0x7f966e42b17d]
designer[0x416781]
======= Memory map: ========
00400000-00469000 r-xp 00000000 08:05 548473                             /usr/bin/designer
00668000-0066b000 rw-p 00068000 08:05 548473                             /usr/bin/designer
00aec000-01781000 rw-p 00000000 00:00 0                                  [heap]
7f9648000000-7f9648021000 rw-p 00000000 00:00 0 
7f9648021000-7f964c000000 ---p 00000000 00:00 0 
7f964c48c000-7f964c48d000 ---p 00000000 00:00 0 
7f964c48d000-7f964cc8d000 rw-p 00000000 00:00 0 
7f964cc8d000-7f964cc8e000 ---p 00000000 00:00 0 
7f964cc8e000-7f964d48e000 rw-p 00000000 00:00 0 
7f964e3f3000-7f964e41a000 r-xp 00000000 08:05 1052630                    /usr/lib/qt/plugins/codecs/libqtwcodecs.so
7f964e41a000-7f964e619000 ---p 00027000 08:05 1052630                    /usr/lib/qt/plugins/codecs/libqtwcodecs.so
7f964e619000-7f964e61a000 rw-p 00026000 08:05 1052630                    /usr/lib/qt/plugins/codecs/libqtwcodecs.so
7f964e61a000-7f964e62d000 r-xp 00000000 08:05 1052629                    /usr/lib/qt/plugins/codecs/libqkrcodecs.so
7f964e62d000-7f964e82c000 ---p 00013000 08:05 1052629                    /usr/lib/qt/plugins/codecs/libqkrcodecs.so
7f964e82c000-7f964e82d000 rw-p 00012000 08:05 1052629                    /usr/lib/qt/plugins/codecs/libqkrcodecs.so
7f964e82d000-7f964e858000 r-xp 00000000 08:05 1052628                    /usr/lib/qt/plugins/codecs/libqjpcodecs.so
7f964e858000-7f964ea58000 ---p 0002b000 08:05 1052628                    /usr/lib/qt/plugins/codecs/libqjpcodecs.so
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7f964ea5a000-7f964ea7d000 r-xp 00000000 08:05 1052627                    /usr/lib/qt/plugins/codecs/libqcncodecs.so
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7f964f0b6000-7f964f0f2000 r-xp 00000000 08:05 1052615                    /usr/lib/qt/plugins/bearer/libqconnmanbearer.so
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7f964f2f3000-7f964f3fb000 rw-p 00000000 00:00 0 
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7f964f608000-7f964f67a000 r-xp 00000000 08:05 550609                     /usr/lib/liborc-0.4.so.0.14.0
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7f964f87f000-7f964f896000 r-xp 00000000 08:05 14477                      /usr/lib/gstreamer-0.10/libgstvideoscale.so
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7f964ff2a000-7f964ff3a000 r-xp 00000000 08:05 14480                      /usr/lib/gstreamer-0.10/libgstxvimagesink.so
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7f965013b000-7f965015b000 r-xp 00000000 08:05 562282                     /usr/lib/libgstaudio-0.10.so.0.24.0
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7f96541a0000-7f96543a0000 ---p 00009000 08:05 4601                       /usr/lib/kde4/plugins/imageformats/kimg_rgb.so
7f96543a0000-7f96543a1000 rw-p 00009000 08:05 4601                       /usr/lib/kde4/plugins/imageformats/kimg_rgb.so
7f96543a1000-7f96543a6000 r-xp 00000000 08:05 4600                       /usr/lib/kde4/plugins/imageformats/kimg_ras.so
7f96543a6000-7f96545a5000 ---p 00005000 08:05 4600                       /usr/lib/kde4/plugins/imageformats/kimg_ras.so
7f96545a5000-7f96545a6000 rw-p 00004000 08:05 4600                       /usr/lib/kde4/plugins/imageformats/kimg_ras.so
7f96545a6000-7f96545aa000 r-xp 00000000 08:05 4604                       /usr/lib/kde4/plugins/imageformats/kimg_psd.so
7f96545aa000-7f96547aa000 ---p 00004000 08:05 4604                       /usr/lib/kde4/plugins/imageformats/kimg_psd.so
7f96547aa000-7f96547ab000 rw-p 00004000 08:05 4604                       /usr/lib/kde4/plugins/imageformats/kimg_psd.so
7f96547ab000-7f96547b0000 r-xp 00000000 08:05 4607                       /usr/lib/kde4/plugins/imageformats/kimg_pic.so
7f96547b0000-7f96549af000 ---p 00005000 08:05 4607                       /usr/lib/kde4/plugins/imageformats/kimg_pic.so
7f96549af000-7f96549b0000 rw-p 00004000 08:05 4607                       /usr/lib/kde4/plugins/imageformats/kimg_pic.so
7f96549b0000-7f96549b7000 r-xp 00000000 08:05 4598                       /usr/lib/kde4/plugins/imageformats/kimg_pcx.so
7f96549b7000-7f9654bb7000 ---p 00007000 08:05 4598                       /usr/lib/kde4/plugins/imageformats/kimg_pcx.so
7f9654bb7000-7f9654bb8000 rw-p 00007000 08:05 4598                       /usr/lib/kde4/plugins/imageformats/kimg_pcx.so
7f9654bb8000-7f9654c06000 r-xp 00000000 08:05 550220                     /usr/lib/libjasper.so.1.0.0
7f9654c06000-7f9654e06000 ---p 0004e000 08:05 550220                     /usr/lib/libjasper.so.1.0.0
7f9654e06000-7f9654e0a000 rw-p 0004e000 08:05 550220                     /usr/lib/libjasper.so.1.0.0
7f9654e0a000-7f9654e11000 rw-p 00000000 00:00 0 
7f9654e11000-7f9654e16000 r-xp 00000000 08:05 4596                       /usr/lib/kde4/plugins/imageformats/kimg_jp2.so
7f9654e16000-7f9655015000 ---p 00005000 08:05 4596                       /usr/lib/kde4/plugins/imageformats/kimg_jp2.so
7f9655015000-7f9655016000 rw-p 00004000 08:05 4596                       /usr/lib/kde4/plugins/imageformats/kimg_jp2.so
7f9655016000-7f965501b000 r-xp 00000000 08:05 550247                     /usr/lib/libIlmThread.so.6.0.0
7f965501b000-7f965521b000 ---p 00005000 08:05 550247                     /usr/lib/libIlmThread.so.6.0.0
7f965521b000-7f965521c000 rw-p 00005000 08:05 550247                     /usr/lib/libIlmThread.so.6.0.0
7f965521c000-7f9655221000 r-xp 00000000 08:05 550245                     /usr/lib/libImath.so.6.0.0
7f9655221000-7f9655420000 ---p 00005000 08:05 550245                     /usr/lib/libImath.so.6.0.0
7f9655420000-7f9655421000 rw-p 00004000 08:05 550245                     /usr/lib/libImath.so.6.0.0
7f9655421000-7f9655463000 r-xp 00000000 08:05 550241                     /usr/lib/libHalf.so.6.0.0
7f9655463000-7f9655662000 ---p 00042000 08:05 550241                     /usr/lib/libHalf.so.6.0.0
7f9655662000-7f9655663000 rw-p 00041000 08:05 550241                     /usr/lib/libHalf.so.6.0.0
7f9655663000-7f965567d000 r-xp 00000000 08:05 550243                     /usr/lib/libIex.so.6.0.0
7f965567d000-7f965587d000 ---p 0001a000 08:05 550243                     /usr/lib/libIex.so.6.0.0
7f965587d000-7f9655881000 rw-p 0001a000 08:05 550243                     /usr/lib/libIex.so.6.0.0
7f9655881000-7f9655943000 r-xp 00000000 08:05 550260                     /usr/lib/libIlmImf.so.6.0.0
7f9655943000-7f9655b42000 ---p 000c2000 08:05 550260                     /usr/lib/libIlmImf.so.6.0.0
7f9655b42000-7f9655b47000 rw-p 000c1000 08:05 550260                     /usr/lib/libIlmImf.so.6.0.0
7f9655b47000-7f9655b4c000 r-xp 00000000 08:05 4606                       /usr/lib/kde4/plugins/imageformats/kimg_exr.so
7f9655b4c000-7f9655d4c000 ---p 00005000 08:05 4606                       /usr/lib/kde4/plugins/imageformats/kimg_exr.so
7f9655d4c000-7f9655d4d000 rw-p 00005000 08:05 4606                       /usr/lib/kde4/plugins/imageformats/kimg_exr.so
7f9655d4d000-7f9655d55000 r-xp 00000000 08:05 4597                       /usr/lib/kde4/plugins/imageformats/kimg_eps.so
7f9655d55000-7f9655f54000 ---p 00008000 08:05 4597                       /usr/lib/kde4/plugins/imageformats/kimg_eps.so
7f9655f54000-7f9655f55000 rw-p 00007000 08:05 4597                       /usr/lib/kde4/plugins/imageformats/kimg_eps.so
7f9655f55000-7f9655f5c000 r-xp 00000000 08:05 4603                       /usr/lib/kde4/plugins/imageformats/kimg_dds.so
7f9655f5c000-7f965615b000 ---p 00007000 08:05 4603                       /usr/lib/kde4/plugins/imageformats/kimg_dds.so
7f965615b000-7f965615c000 rw-p 00006000 08:05 4603                       /usr/lib/kde4/plugins/imageformats/kimg_dds.so
7f965615c000-7f96561bd000 r-xp 00000000 08:05 548192                     /usr/lib/libtiff.so.3.9.5
7f96561bd000-7f96563bd000 ---p 00061000 08:05 548192                     /usr/lib/libtiff.so.3.9.5
7f96563bd000-7f96563c0000 rw-p 00061000 08:05 548192                     /usr/lib/libtiff.so.3.9.5
7f96563c0000-7f96563c7000 r-xp 00000000 08:05 1052625                    /usr/lib/qt/plugins/imageformats/libqtiff.so
7f96563c7000-7f96565c6000 ---p 00007000 08:05 1052625                    /usr/lib/qt/plugins/imageformats/libqtiff.so
7f96565c6000-7f96565c7000 rw-p 00006000 08:05 1052625                    /usr/lib/qt/plugins/imageformats/libqtiff.so
7f96565c7000-7f96565cc000 r-xp 00000000 08:05 1052624                    /usr/lib/qt/plugins/imageformats/libqsvg.so
7f96565cc000-7f96567cb000 ---p 00005000 08:05 1052624                    /usr/lib/qt/plugins/imageformats/libqsvg.so
7f96567cb000-7f96567cc000 rw-p 00004000 08:05 1052624                    /usr/lib/qt/plugins/imageformats/libqsvg.so
7f96567cc000-7f9656838000 r-xp 00000000 08:05 548314                     /usr/lib/libmng.so.1.0.0
7f9656838000-7f9656a37000 ---p 0006c000 08:05 548314                     /usr/lib/libmng.so.1.0.0
7f9656a37000-7f9656a3c000 rw-p 0006b000 08:05 548314                     /usr/lib/libmng.so.1.0.0
7f9656a3c000-7f9656a41000 r-xp 00000000 08:05 1052623                    /usr/lib/qt/plugins/imageformats/libqmng.so
7f9656a41000-7f9656c41000 ---p 00005000 08:05 1052623                    /usr/lib/qt/plugins/imageformats/libqmng.so
7f9656c41000-7f9656c42000 rw-p 00005000 08:05 1052623                    /usr/lib/qt/plugins/imageformats/libqmng.so
7f9656c42000-7f9656c7d000 r-xp 00000000 08:05 548178                     /usr/lib/libjpeg.so.8.0.2
7f9656c7d000-7f9656e7d000 ---p 0003b000 08:05 548178                     /usr/lib/libjpeg.so.8.0.2
7f9656e7d000-7f9656e7e000 rw-p 0003b000 08:05 548178                     /usr/lib/libjpeg.so.8.0.2
7f9656e7e000-7f9656e8e000 rw-p 00000000 00:00 0 
7f9656e8e000-7f9656e95000 r-xp 00000000 08:05 1052621                    /usr/lib/qt/plugins/imageformats/libqjpeg.so
7f9656e95000-7f9657094000 ---p 00007000 08:05 1052621                    /usr/lib/qt/plugins/imageformats/libqjpeg.so
7f9657094000-7f9657095000 rw-p 00006000 08:05 1052621                    /usr/lib/qt/plugins/imageformats/libqjpeg.so
7f9657095000-7f965709c000 r-xp 00000000 08:05 1052626                    /usr/lib/qt/plugins/imageformats/libqico.so
7f965709c000-7f965729b000 ---p 00007000 08:05 1052626                    /usr/lib/qt/plugins/imageformats/libqico.so
7f965729b000-7f965729c000 rw-p 00006000 08:05 1052626                    /usr/lib/qt/plugins/imageformats/libqico.so
7f965729c000-7f96572a2000 r-xp 00000000 08:05 1052622                    /usr/lib/qt/plugins/imageformats/libqgif.so
7f96572a2000-7f96574a2000 ---p 00006000 08:05 1052622                    /usr/lib/qt/plugins/imageformats/libqgif.so
7f96574a2000-7f96574a3000 rw-p 00006000 08:05 1052622                    /usr/lib/qt/plugins/imageformats/libqgif.so
7f96574a3000-7f9657eb3000 rw-s 00000000 08:05 397192                     /var/tmp/kdecache-massimiliano/icon-cache.kcache
7f9657eb3000-7f9657fb3000 rw-p 00000000 00:00 0 
7f9657fb3000-7f9657fb4000 ---p 00000000 00:00 0 
7f9657fb4000-7f96587b4000 rw-p 00000000 00:00 0 
7f96587b4000-7f96587d5000 r-xp 00000000 08:05 567554                     /usr/lib/liboktetacore.so.4.7.0
7f96587d5000-7f96589d4000 ---p 00021000 08:05 567554                     /usr/lib/liboktetacore.so.4.7.0
7f96589d4000-7f96589d6000 rw-p 00020000 08:05 567554                     /usr/lib/liboktetacore.so.4.7.0
7f96589d6000-7f9658a0b000 r-xp 00000000 08:05 567555                     /usr/lib/liboktetagui.so.4.7.0
7f9658a0b000-7f9658c0b000 ---p 00035000 08:05 567555                     /usr/lib/liboktetagui.so.4.7.0
7f9658c0b000-7f9658c0e000 rw-p 00035000 08:05 567555                     /usr/lib/liboktetagui.so.4.7.0
7f9658c0e000-7f9658c13000 r-xp 00000000 08:05 50495                      /usr/lib/kde4/plugins/designer/oktetadesignerplugin.so
7f9658c13000-7f9658e12000 ---p 00005000 08:05 50495                      /usr/lib/kde4/plugins/designer/oktetadesignerplugin.so
7f9658e12000-7f9658e13000 rw-p 00004000 08:05 50495                      /usr/lib/kde4/plugins/designer/oktetadesignerplugin.so
7f9658e13000-7f9658e27000 r-xp 00000000 08:05 559870                     /usr/lib/libprocesscore.so.4.7.0
7f9658e27000-7f9659027000 ---p 00014000 08:05 559870                     /usr/lib/libprocesscore.so.4.7.0
7f9659027000-7f9659028000 rw-p 00014000 08:05 559870                     /usr/lib/libprocesscore.so.4.7.0
7f9659028000-7f965906a000 r-xp 00000000 08:05 559871                     /usr/lib/libprocessui.so.4.7.0
7f965906a000-7f965926a000 ---p 00042000 08:05 559871                     /usr/lib/libprocessui.so.4.7.0
7f965926a000-7f965926d000 rw-p 00042000 08:05 559871                     /usr/lib/libprocessui.so.4.7.0
7f965926d000-7f9659272000 r-xp 00000000 08:05 43895                      /usr/lib/kde4/plugins/designer/ksysguardwidgets.so
7f9659272000-7f9659471000 ---p 00005000 08:05 43895                      /usr/lib/kde4/plugins/designer/ksysguardwidgets.so
7f9659471000-7f9659472000 rw-p 00004000 08:05 43895                      /usr/lib/kde4/plugins/designer/ksysguardwidgets.so
7f9659472000-7f9659478000 r-xp 00000000 08:05 559869                     /usr/lib/liblsofui.so.4.7.0
7f9659478000-7f9659677000 ---p 00006000 08:05 559869                     /usr/lib/liblsofui.so.4.7.0
7f9659677000-7f9659678000 rw-p 00005000 08:05 559869                     /usr/lib/liblsofui.so.4.7.0
7f9659678000-7f965967c000 r-xp 00000000 08:05 43894                      /usr/lib/kde4/plugins/designer/ksysguardlsofwidgets.so
7f965967c000-7f965987b000 ---p 00004000 08:05 43894                      /usr/lib/kde4/plugins/designer/ksysguardlsofwidgets.so
Annullato

["Annullato" is italian for "Aborted"]

Hope that helps

kachelaqa · 2011-08-17 18:49:43

@raptorista

if you haven't done so already, i would recommend that you made a bug report using the output you've just posted.

George · 2011-08-17 19:02:06

google turns up the suggestion to try using setting an env variable MALLOC_CHECK_=0 before running the program, it won't fix anything but may let you get on with using it.

Raptorista · 2011-08-17 21:32:31

@kachelaqa: I did it, here it is: https://bugs.archlinux.org/task/25629

It's the first time I make a bug report, so tell me if I missed anything.

Meanwhile I "workarounded" the problem: as suggested by George [which I thank]

export MALLOC_CHECK_=0

"fixes" it, in fact the following time I got

$ designer
Application asked to unregister timer 0xe000003 which is not registered in this thread. Fix application.
Application asked to unregister timer 0x12000002 which is not registered in this thread. Fix application.
designer: symbol lookup error: /usr/lib/qt/plugins/designer/libqwt_designer_plugin.so: undefined symbol: _ZN9QwtSliderC1EP7QWidgetN2Qt11OrientationENS_8ScalePosENS_7BGSTYLEE

but that was solved renaming file /usr/lib/qt/plugins/designer/libqwt_designer_plugin.so so that now it launches.

Last edited by Raptorista (2011-08-17 21:40:02)

Arch Linux

#1 2011-08-15 08:05:42

Qt Designer crashes on startup

#2 2011-08-15 14:55:03

Re: Qt Designer crashes on startup

#3 2011-08-15 15:40:12

Re: Qt Designer crashes on startup

#4 2011-08-15 15:55:20

Re: Qt Designer crashes on startup

#5 2011-08-15 17:44:21

Re: Qt Designer crashes on startup

#6 2011-08-17 11:01:05

Re: Qt Designer crashes on startup

#7 2011-08-17 18:49:43

Re: Qt Designer crashes on startup

#8 2011-08-17 19:02:06

Re: Qt Designer crashes on startup

#9 2011-08-17 21:32:31

Re: Qt Designer crashes on startup

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