#304 Save new project causes segfault

[Anonymous]

Meshlab trunk: HEAD of today, but also present in all versions of the past months.

When saving a new project on Ubuntu, a segfault occurs. I can work around it by applying this hack:

Index: meshlab/mainwindow_RunTime.cpp

--- meshlab/mainwindow_RunTime.cpp (revision 5640)
+++ meshlab/mainwindow_RunTime.cpp (working copy)
@@ -1493,7 +1493,8 @@

/*WARNING!!!!!! CHANGE IT!!! ALSO IN THE OPENPROJECT FUNCTION**/
meshDoc()->setDocLabel(fileName);

• mdiarea->activeSubWindow()->setWindowTitle(meshDoc()->docLabel());
• if (mdiarea->activeSubWindow() )
• mdiarea->activeSubWindow()->setWindowTitle(meshDoc()->docLabel());
  layerDialog->setWindowTitle(meshDoc()->docLabel());
  /************/

The problem is that for some reason, there's no activeSubWindow()

This bug is present for quite some revisions already.

[Antonio Martos]

Same here. This happens at least in 1.3.0 binaries as included in Mint 14 (nadia) repositories and also in 1.3.2 from:

https://launchpadlibrarian.net/111065780/meshlab_1.3.2_amd64.deb

So, it seems to be quite widespread and that would make Meshlab almost unusable in many recent Ubuntu/Mint based system.

martos@fx ~ $ gdb meshlab
GNU gdb (GDB) 7.5-ubuntu
...
This GDB was configured as "x86_64-linux-gnu".
(gdb) r
Starting program: /usr/bin/meshlab
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Go to File / Save Project
Enter file name
Press Save button and crashes:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff5d4d4b9 in QWidget::windowTitle() const ()
from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
(gdb) c
Continuing.
[Thread 0x7fffd5a5e700 (LWP 18186) exited]
[Thread 0x7fffd689b700 (LWP 18185) exited]

Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.

tail of: >ltrace meshlab

_ZNK8QMdiArea16currentSubWindowEv(0x206ba40, 0x2587dc0, 0x4e6f20, 0, 0) = 0x25a17b0
_ZNK11QMetaObject4castEP7QObject(0x4e6f20, 0x25a17b0, 0x257b2c0, 0, 0) = 0
_ZNK8QMdiArea16currentSubWindowEv(0x206ba40, 0x25a17b0, 0, 0, 0) = 0x25a17b0
_ZNK8QMdiArea16currentSubWindowEv(0x206ba40, 0, 0x257b2c0, 0, 0) = 0x25a17b0
_ZNK13QMdiSubWindow6widgetEv(0x25a17b0, 0, 0x257b2c0, 0, 0) = 0x2587dc0
_ZNK11QMetaObject4castEP7QObject(0x4e6f20, 0x2587dc0, 0x257b2c0, 0, 0) = 0x2587dc0
_ZNK8QMdiArea15activeSubWindowEv(0x206ba40, 0x2587dc0, 0x4e6f01, 0, 0) = 0
_ZN7QWidget14setWindowTitleERK7QString(0, 0x7fff34f281f0, 0x4e6f01, 0, 0 <unfinished ...="">
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++</unfinished>

[Paco Escarpa]

This hack works for 1.3.0 on gcc (SUSE Linux) 4.7.1 20120723 [gcc-4_7-branch revision 189773] (OpenSUSE 12.2)

[Paco Escarpa]

Sorry, 1.3.3