Bus Error Core Dumped
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Bus Error Core Dumped Linux
Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 bus error core dumped ubuntu million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What is a bus error? up vote 155 down vote favorite 49 What does the "bus error" message mean, bus error core dumped solaris 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 15.8k51952 asked Oct 17 '08 at 14:48 raldi 7,239216178 add a comment| 15 Answers 15 active oldest votes up vote 150 down vote accepted Bus errors are rare nowadays on x86 and occur when your processor cannot even attempt the memory access requested, typically: using a processor instruction with
Bus Error Core Dumped C Programming
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 5,70322336 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 5 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 malloc, and then write to enough of it and you'll get a bus error. –Eloff Jul 14 '15 at 0:09 add a comment| up vote 55 down vote A seg
dumped)" Pages: 1 #1 2013-05-08 22:28:13 gay Member Registered: 2012-12-16 Posts: 73 A hint regarding applications failing with: "Bus error (core dumped)" This happens to me sometimes, for the solution see at the end of this centos bus error core dumped posting after the description of the error. From GUII try to start an application debug bus error (it might be that this only concerns gtk applications such as evince & gthumb but I don't know). The application
Gdb Bus Error
does not start, instead I am told by my GUI (e17) 'XXXX (the application) stopped running unexpectedly. There was no error message. This error log will be saved as /home/...'. This error message http://stackoverflow.com/questions/212466/what-is-a-bus-error matches the various joke error messages concocted by Microsoft in unhelpfulness. The log is not saved.From TerminalI try to start it from the terminal. The terminal tells me 'Bus error (core dumped)'. Nothing more. I could not find any coredump - though the journalctl log does at least know about this: "May 09 02:03:07 xxxxxx systemd-coredump[9439]: Process 9436 (XXXX) dumped core." Running the application with strace https://bbs.archlinux.org/viewtopic.php?id=162972 is also not very helpful, though it hints that it all has to do with dconf: "open("/etc/dconf/profile/user", O_RDONLY) = -1 ENOENT (No such file or directory) (...) open("/home/xxxxx/.config/dconf/user", O_RDONLY) = 11"Google searches etc.Not helpful. But then again: who is going to talk about google any more in just a couple of years.Solutionremove /home/
has received a signal indicating that it attempted to http://www.glue.umd.edu/afs/glue.umd.edu/system/info/olh/Utilities/Unix_answers/unix_bus_or_seg.html perform I/O to a device that is restricted or that does not exist. bus error This message is usually accompanied by a core dump, except on read-only file systems. Action Use a debugger to examine the core file and determine what program bus error core fault or system problem led to the bus error. If possible, check the program's output files for data corruption that might have occurred before the bus error. Technical Notes Bus errors can result from either a programming error or device corruption on your system. Some common causes of bus errors are: invalid file descriptors, unreasonable I/O requests, bad memory allocation, misaligned data structures, compiler bugs, and corrupt boot blocks. Previous: Broken pipeNext: "C" © 2010, Oracle Corporation and/or its affiliates
program yourself, you can skip the rest of this section. For College-supported software, you can report the bug by contacting a consultant through olc or "mail staff". ------------------------------------------------------------------------------- If the program displays this message: Bus error or Segmentation fault or Core dump ... then the program was trying to access a memory location outside its address space. The computer detected this problem and sent a signal to your program, which caused it to abort. Things that cause bus errors and segmentation violations are typically out-of-bounds array references and/or references through uninitialized or mangled pointers. Look very closely in your program for bizarre things like that. A common example in C is: int c; scanf("%d", c); instead of the correct version: int c; scanf("%d", &c); An example from C++ is: int* p=new int[100]; cout<< p[100]; instead of the correct version: int* p=new int[100]; cout << p[99] (remember array referances in C and C++ start with 0 ) There are a number of methods for finding out where the program went out of bounds. One method is to use printf() statements to determine how far the program is getting before it crashes, and to print out the contents of interesting variables. A more sophisticated method is using 'dbx', a source level symbolic debugger. C and C++ programmers can also use 'gdb'. To learn about 'dbx', you can read the manual pages by using the 'man' command, as in: man dbx To learn about 'gdb', you can read the manual node in the 'xinfo' program, or using 'M-x info' in Emacs. If you need to debug your program, you may want to enable a core dump. Usually, those two messages above would also have "(core dumped)" by them, indicating that the program wrote an image of its current memory into a file called "core" in that directory. You might want to type 'fs lq' and find out how many blocks (kilobytes) you have available in your quota. Then you can type, say: limit coredumpsize 100 .. to limit your core dump size to 100K for your current login. BE CAREFUL not to let yourself go over quota, as you would then not be able to create or edit files. You should delete the "core