[PyQt] Segfault with QDesktopServices.openUrl

[Phil Thompson]

On 21/08/2014 3:58 am, Kovid Goyal wrote:
> https://github.com/kovidgoyal/calibre/commit/796cba4b6996d2047f203ce0a0ef0637b10b33ec
> 
> Kovid.

I'm not sure it's a Qt bug. There are lots of things (often platform 
specific) that you can't do until you have created a QApplication.

Phil

> On Wed, Aug 20, 2014 at 09:07:05PM +0200, Florian Bruhin wrote:
>> Hi,
>> 
>> I get a segfault every time I try to use QDesktopServices.openUrl.
>> /tmp/test.txt is a simple text file.
>> 
>> Am I doing something wrong, or is this a bug somewhere?
>> 
>> GDB output:
>> 
>> $ gdb /usr/bin/python
>> ...
>> Python 3.4.1 (default, May 19 2014, 17:23:49)
>> [GCC 4.9.0 20140507 (prerelease)] on linux
>> Type "help", "copyright", "credits" or "license" for more information.
>> >>> from PyQt5.QtGui import QDesktopServices
>> >>> from PyQt5.QtCore import QUrl
>> >>> QDesktopServices.openUrl(QUrl('file:///tmp/test.txt'))
>> 
>> Program received signal SIGSEGV, Segmentation fault.
>> 0x00007ffff5b5a870 in QDesktopServices::openUrl(QUrl const&) () from 
>> /usr/lib/libQt5Gui.so.5
>> (gdb) bt
>> #0  0x00007ffff5b5a870 in QDesktopServices::openUrl(QUrl const&) () 
>> from /usr/lib/libQt5Gui.so.5
>> #1  0x00007ffff60cb3ee in ?? () from 
>> /usr/lib/python3.4/site-packages/PyQt5/QtGui.so
>> #2  0x00007ffff7a5dbf5 in call_function (oparg=<optimized out>, 
>> pp_stack=0x7fffffffdb50) at Python/ceval.c:4227
>> #3  PyEval_EvalFrameEx (f=0x678998, throwflag=<optimized out>) at 
>> Python/ceval.c:2829
>> #4  0x00007ffff7a5f289 in PyEval_EvalCodeEx (_co=0x0, 
>> _co at entry=0x7ffff7e44c00, globals=0x0, locals=0x678b10,
>>     args=0x0, argcount=24, argcount at entry=0, kws=0x2f, kws at entry=0x0, 
>> kwcount=0, defs=0x0, defcount=0,
>>     kwdefs=0x0, closure=0x0) at Python/ceval.c:3578
>> #5  0x00007ffff7a5f32b in PyEval_EvalCode (co=co at entry=0x7ffff7e44c00, 
>> globals=globals at entry=0x7ffff7f1f548,
>>     locals=locals at entry=0x7ffff7f1f548) at Python/ceval.c:773
>> #6  0x00007ffff7a7b4d4 in run_mod (mod=mod at entry=0x71bd38, 
>> filename=filename at entry=0x7ffff7ed7c70,
>>     globals=0x7ffff7f1f548, locals=0x7ffff7f1f548, 
>> flags=flags at entry=0x7fffffffddf0,
>>     arena=arena at entry=0x7401d0) at Python/pythonrun.c:2180
>> #7  0x00007ffff7a7e1a2 in PyRun_InteractiveOneObject 
>> (fp=fp at entry=0x7ffff77229c0 <_IO_2_1_stdin_>,
>>     filename=filename at entry=0x7ffff7ed7c70, 
>> flags=flags at entry=0x7fffffffddf0) at Python/pythonrun.c:1445
>> #8  0x00007ffff7a7e45e in PyRun_InteractiveLoopFlags 
>> (fp=fp at entry=0x7ffff77229c0 <_IO_2_1_stdin_>,
>>     filename_str=filename_str at entry=0x7ffff7b030d6 "<stdin>", 
>> flags=flags at entry=0x7fffffffddf0)
>>     at Python/pythonrun.c:1324
>> #9  0x00007ffff7a7f4de in PyRun_AnyFileExFlags (fp=0x7ffff77229c0 
>> <_IO_2_1_stdin_>,
>>     filename=0x7ffff7b030d6 "<stdin>", closeit=0, 
>> flags=0x7fffffffddf0) at Python/pythonrun.c:1286
>> #10 0x00007ffff7a94751 in run_file (p_cf=<optimized out>, 
>> filename=<optimized out>, fp=<optimized out>)
>>     at Modules/main.c:319
>> #11 Py_Main (argc=0, argv=0x0) at Modules/main.c:751
>> #12 0x0000000000400af6 in main ()
>> 
>> 
>> Thanks,
>> 
>> Florian
>> 
>> --
>> http://www.the-compiler.org | me at the-compiler.org (Mail/XMPP)
>>              GPG 0xFD55A072 | http://the-compiler.org/pubkey.asc
>>          I love long mails! | http://email.is-not-s.ms/
> 
> 
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