You are here

Home › Forums › Projects › qtractor

Weston and Qt5

4 February, 2015 - 08:57 — bradskins

I've built qtractor with qt5. When I launch on weston using

qtractor -platform wayland

I get a segfault. Any help is appreciated.

AttachmentSize
Plain text icon debug.txt1.79 KB
Forums: 
qtractor
4 February, 2015 - 10:56 — rncbc
rncbc's picture

this debug output:
...

#3  0x00007f8742f9f510 in QMimeData::hasUrls() const () from /usr/lib64/libQt5Core.so.5
#4  0x00000000004a1170 in qtractorFiles::stabilizeSlot (this=0x248fc10) at qtractorFiles.cpp:428

...
actually points to src/qtractorFiles.cpp, lines 427-8:

	m_pPasteItemAction->setEnabled(
		(QApplication::clipboard()->mimeData())->hasUrls());

which might be QApplication::clipboard()->mimeData() that is returning an invalid pointer, possibly NULL. if it is so, it's a bug in your specific Qt5 version on Weston: QClipboard::mimeData() should always return a valid pointer.

ok, just to be sure, would you be so kind and edit src/qtractorFiles.cpp, lines 427-8 as above, and rewrite/paste the following instead?

	const QMimeData *pMimeData = QApplication::clipboard()->mimeData();
	m_pPasteItemAction->setEnabled(pMimeData && pMimeData->hasUrls());

if it works or gets it through and beyond, then it's confirmed as a Qt5 bug, specific to your version on Weston perhaps. it has come to my knowledge that Qt5 on Android suffered from the same a while ago. maybe it's the same on Weston, maybe not. you're my eyes and ears over there ;)

hth.
cheers.

5 February, 2015 - 06:27 — bradskins

It crashes again. XCB platform works fine.

5 February, 2015 - 09:41 — rncbc
rncbc's picture

It crashes again. XCB platform works fine.

but now you missed the debug crash stacktrace output.

is it still possible to replicate the segfault?

byee

8 February, 2015 - 14:06 — bradskins 

  
  [New LWP 30018]
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib64/libthread_db.so.1".
  0x00007f69eec4e8a9 in waitpid () from /lib64/libpthread.so.0

  Thread 2 (Thread 0x7f69e4ffd700 (LWP 30018)):
  #0  0x00007f69ee18bac3 in select () from /lib64/libc.so.6
  #1  0x00007f69ef3aff31 in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () from /usr/lib64/libQt5Core.so.5
  #2  0x00007f69ef3b1965 in QEventDispatcherUNIXPrivate::doSelect(QFlags, timespec*) () from /usr/lib64/libQt5Core.so.5
  #3  0x00007f69ef3b1ead in QEventDispatcherUNIX::processEvents(QFlags) () from /usr/lib64/libQt5Core.so.5
  #4  0x00007f69ef35dbe2 in QEventLoop::exec(QFlags) () from /usr/lib64/libQt5Core.so.5
  #5  0x00007f69ef18028c in QThread::exec() () from /usr/lib64/libQt5Core.so.5
  #6  0x00007f69ef184fef in QThreadPrivate::start(void*) () from /usr/lib64/libQt5Core.so.5
  #7  0x00007f69eec47194 in start_thread () from /lib64/libpthread.so.0
  #8  0x00007f69ee1929dd in clone () from /lib64/libc.so.6

  Thread 1 (Thread 0x7f69f274e7c0 (LWP 30017)):
  #0  0x00007f69eec4e8a9 in waitpid () from /lib64/libpthread.so.0
  #1  0x00000000004347f6 in stacktrace (signo=11) at qtractor.cpp:305
  #2  <signal handler called>
  #3  0x00007f69ef388510 in QMimeData::hasUrls() const () from /usr/lib64/libQt5Core.so.5
  #4  0x00000000005f00c2 in qtractorMainForm::stabilizeForm (this=0x7fff182d3550) at qtractorMainForm.cpp:5696
  #5  0x00000000004a12c0 in qtractorFiles::stabilizeSlot (this=0x1848930) at qtractorFiles.cpp:444
  #6  0x000000000049fef1 in qtractorFiles::qtractorFiles (this=0x1848930, pParent=0x7fff182d3550) at qtractorFiles.cpp:161
  #7  0x00000000005de5b0 in qtractorMainForm::setup (this=0x7fff182d3550, pOptions=0x7fff182d3300) at qtractorMainForm.cpp:1193
  #8  0x0000000000436f69 in main (argc=1, argv=0x7fff182d3f18) at qtractor.cpp:535
8 February, 2015 - 18:37 — rncbc
rncbc's picture 

#3  0x00007f69ef388510 in QMimeData::hasUrls() const () from /usr/lib64/libQt5Core.so.5

so it's most probably the same issue as before, QClipboard::mimeData() returning a NULL pointer, when it shouldn't--just on a different spot.

please try new build from todays git head (>= qtractor-0.6.5.8git.bb78c3).

hth.
cheers

Add new comment

Copyright (C) 2006-2024 rncbc aka Rui Nuno Capela. All rights reserved.
Powered by Drupal