Qt Bus Error
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn bus error c++ more about Stack Overflow the company Business Learn more about hiring developers or bus error linux posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow bus error vs segmentation fault Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What is a bus error? up vote 156 down how to fix bus error in linux vote favorite 49 What does the "bus error" message mean, and how does it differ from a segfault? c unix segmentation-fault bus-error share|improve this question edited Oct 18 '15 at 10:44 Cool Guy 15.7k51952 asked Oct 17 '08 at 14:48 raldi 7,272216178 add a comment| 15 Answers 15 active oldest votes up vote 152 down vote accepted Bus errors are rare nowadays on x86 and occur when your
Linux Bus Error Core Dumped
processor cannot even attempt the memory access requested, typically: using a processor instruction with an address that does not satisfy its alignment requirements. Segmentation faults occur when accessing memory which does not belong to your process, they are very common and are typically the result of: using a pointer to something that was deallocated. using an uninitialized hence bogus pointer. using a null pointer. overflowing a buffer. PS: To be more precise this is not manipulating the pointer itself that will cause issues, it's accessing the memory it points to (dereferencing). share|improve this answer edited Oct 17 '08 at 15:18 answered Oct 17 '08 at 15:12 bltxd 5,75322336 52 They aren't rare; I'm just at Exercise 9 from How to Learn C the Hard Way and already encountered one... –11684 Mar 26 '13 at 20:12 6 Another cause of bus errors (on Linux anyway) is when the operating system can't back a virtual page with physical memory (e.g. low-memory conditions or out of huge pages when using huge page memory.) Typically mmap (and malloc) just reserve the virtual address space, and the kernel assigns the physical memory on demand (so called soft page faults.) Make a large enough ma
a list of 32 buttons, basically clicking the button activates a boolean in an array stored off in some legacy C code.
How To Debug Bus Error
If I switch the checkbox buttons around to activate all 32 at one bus error python time, there's no problem. However, just doing it one by one causes it to blow up at some point bus error ubuntu between 2 and 20 clicks. I deleted all the buttons and redid them, doesn't help. Making the array of 32 booleans in the legacy C code integers only makes the issue worse (1 http://stackoverflow.com/questions/212466/what-is-a-bus-error to 5 clicks to blow up instead of 2 to 20). It definitely has something to do with that array, but doesn't really make any sense why that should be causing the QT stuff to blow up. From the debugger, it appears as though one of the widgets may acquire an invalid address (0x1010101) at some point. Any suggestions? I'm going to try and run http://www.qtcentre.org/archive/index.php/t-699.html it under windows to see if that makes a difference too. Thanks! Taylor34 jacek15th February 2006, 15:44From the debugger, it appears as though one of the widgets may acquire an invalid address (0x1010101) at some point. Any suggestions? Doesn't it look like the contents of that array? Do you use threads? Could you post the code which is run after the click? wysota15th February 2006, 15:48The bus error on Solaris is sometimes caused by a bug in the compiler. Take that into consideration when looking for solutions. taylor3415th February 2006, 16:07The bus error on Solaris is sometimes caused by a bug in the compiler. Take that into consideration when looking for solutions. That's what I was wondering, because where it breaks in the debugger is way down in some of the qt base files, way after the C baseline code has executed. It appears to die because it tries to do qlnode::getData() on an invalid widget address (the 0x1010101) that it gets from "it", some variable inside the qt baseline code. Taylor34 taylor3415th February 2006, 23:40Btw, found out the problem. When I was passing my button number down to lower legacy stuff,
QtForum.org » Qt » Qt Programming » bus error - HELP!! Dear visitor, welcome to QtForum.org. If this is your first visit here, please read the Help. It explains in detail how this page works. To use http://www.qtforum.org/article/12663/bus-error-help.html all features of this page, you should consider registering. Please use the registration form, to register here or read more information about the registration process. If you are already registered, please login here. Skip https://ubuntuforums.org/showthread.php?t=1318893 user information kevireid Trainee Posts: 122 1 Friday, July 8th 2005, 10:02am bus error - HELP!! I am trying to draw lines on a QCanvas between two QCanvasRectangles. I have two slots, here is the bus error code: Source code 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 void DiagramView::startLine() { //DiagramBox *pTempBox = (DiagramBox *) activeItem; pTempStartBox = (DiagramBox *) activeItem; //pTempLine->setPoints(startx, starty, -1, -1); startx = (pTempStartBox->x() + ((pTempStartBox->width())/2)); starty = (pTempStartBox->y() + ((pTempStartBox->height()/2))); addLine(); } void DiagramView::endLine() { //DiagramBox *pTempBox qt bus error = (DiagramBox *) activeItem; pTempEndBox = (DiagramBox *) activeItem; endx = (pTempEndBox->x() + ((pTempEndBox->width())/2)); endy = (pTempEndBox->y() + ((pTempEndBox->height())/2)); //DiagramLine* pTempLine = (DiagramLine*) pendingItem; pTempLine->setPoints(startx, starty, endx, endy); // The bus error occurs here pTempStartBox->endingLines.push_back(pTempLine); pTempEndBox->endingLines.push_back(pTempLine); DiagramView::showNewItem(pendingItem); pendingItem = 0; DiagramBox, DiagramView and DiagramLine are subclasses of QCanvasRectangle, QCanvasView and QCanvasLine respectively. Does anyone know what is wrong? thanks in advance.. kr Go to the top of the page Skip user information jacek Master Posts: 2,729 Location: Warsaw, Poland 2 Friday, July 8th 2005, 10:21am RE: bus error - HELP!! Quoted Originally posted by kevireid //DiagramLine* pTempLine = (DiagramLine*) pendingItem; pTempLine->setPoints(startx, starty, endx, endy); // The bus error occurs here Have you initialized that pTempLine pointer before use? You can meet me at Qt Centre - The Ultimate Qt Community site. This post has been edited 1 times, last edit by "jacek" (Jul 8th 2005, 10:22am) Go to the top of the page Skip user information kevireid Trainee Posts: 122 3 Friday, July 8th 2005, 10:29am RE: bus error - HELP!! THanks. Yes, I have initialised it. I managed to solve the problem - I hadn't initialised a variable in another function. I have a new problem now: My DiagramView objects each contain 2 QCan
Get Kubuntu Get Xubuntu Get Lubuntu Get UbuntuStudio Get Mythbuntu Get Edubuntu Get Ubuntu-GNOME Get UbuntuKylin Ubuntu Code of Conduct Ubuntu Wiki Community Wiki Other Support Launchpad Answers Ubuntu IRC Support AskUbuntu Official Documentation User Documentation Social Media Facebook Twitter Useful Links Distrowatch Bugs: Ubuntu PPAs: Ubuntu Web Upd8: Ubuntu OMG! Ubuntu Ubuntu Insights Planet Ubuntu Activity Page Please read before SSO login Advanced Search Forum The Ubuntu Forum Community Ubuntu Official Flavours Support General Help [ubuntu] every application written with QT or KDE libraries seems to crash with bus error Having an Issue With Posting ? Do you want to help us debug the posting issues ? < is the place to report it, thanks ! Results 1 to 3 of 3 Thread: every application written with QT or KDE libraries seems to crash with bus error Thread Tools Show Printable Version Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode November 8th, 2009 #1 Stan-O View Profile View Forum Posts Private Message First Cup of Ubuntu Join Date Sep 2009 Beans 4 every application written with QT or KDE libraries seems to crash with bus error I Just installed new ubuntu 9.10 and then I got some really bad problems. I have a problem that every program that uses QT library like amarok or K3B or keepassx or skype crash with bus error at startup making them unusable. If I run any of this programs with GDB I get following output after run command: Program received signal SIGBUS, Bus error. 0x001b847e in ?? () from /lib/ld-linux.so.2 The Address is different for each program but the error is the same. Can somebody help me solve this problem? Last edited by Stan-O; November 8th, 2009 at 07:04 AM. Adv Reply November 8th, 2009 #2 juzzlin View Profile View Forum Posts Private Message 5 Cups of Ubuntu Join Date Nov 2009 Location Finland Beans 20 DistroUbuntu 12.04 Precise Pangolin Re: every application written with QT or KDE libraries seems to crash with bus error Hmm...bus error usually tells about unaligned memory location. Could you try to reinstall your Qt libraries? sudo apt-get install --reinstall libqtgui4 Adv Reply November 8th, 2009 #3 Stan-O View Profile View Forum Posts Private Message First Cup of