Program Received Signal Sigbus 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 bus error c++ Learn 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 linux bus error core dumped 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 debug bus error 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
How To Solve Bus Error In Linux
your 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
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 more about Stack Overflow the company Business Learn
Bus Error Vs Segmentation Fault
more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags sigbus error linux Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, bus error python helping each other. Join them; it only takes a minute: Sign up How to get a “bus error”? up vote 12 down vote favorite 1 I am trying very hard to get a bus error. One way http://stackoverflow.com/questions/212466/what-is-a-bus-error is misaligned access and I have tried the examples given here and here, but no error for me - the programs execute just fine. Is there some situation which is sure to produce a bus error? c++ bus-error share|improve this question edited Jan 15 '10 at 9:50 asked Jan 15 '10 at 4:06 Lazer 25.2k66212310 2 What platform and hardware architecture are you using? –R Samuel Klatchko Jan 15 '10 at 5:32 it http://stackoverflow.com/questions/2069450/how-to-get-a-bus-error should be noted that by default x86 will not have a bus error, instead it will work but the memory access will be not as performant as an aligned read. on the other hand SPARC arches do have a bus error. –Evan Teran Jan 15 '10 at 6:50 1 No, see Michael Burr's comments and my answer. Even on x86, you can get a bus error by attempting to access memory which does not exist (as opposed to a segmentation fault, which comes from a violation of access policy). –ephemient Jan 16 '10 at 16:29 add a comment| 11 Answers 11 active oldest votes up vote 11 down vote accepted Bus errors can only be invoked on hardware platforms that: Require aligned access, and Don't compensate for an unaligned access by performing two aligned accesses and combining the results. You probably do not have access to such a system. share|improve this answer answered Jan 15 '10 at 4:09 Ignacio Vazquez-Abrams 447k64800956 is there some way to be sure of that? –Lazer Jan 15 '10 at 4:11 @eSKay: If you're using an Intel CPU, which means basically any personal computer nowadays, you will never get a bus error from misaligned access. If you're using PowerPC, SPARC, etc., then you can cause a bus error that way. –Chris Jester-Young Jan 15 '10 at
your http://www.gnu.org/s/libc/manual/html_node/Program-Error-Signals.html question and get tips & solutions from a community of 418,623 IT Pros & Developers. It's quick & easy. Program received signal SIGBUS, Bus error. P: 5 bubbles19518 bus error I have my c project which works fine and compiles fine on my home machine (MacBook Pro Mac OSX). When I upload it to my school server and compile it there it compiles but I get bus error linux a bus error when I try option 2. My program gets graded on the school server, so its important I get it to compile lol. My school server is some sort of linux machine, not sure which. I think the problem code is here: Expand|Select|Wrap|Line Numbers head->paths[letter]=(node*)malloc(sizeof(node)); head->paths[letter]->c=word[i]; head->paths[letter]->setn=malloc((strlen(head->setn)+2)*sizeof(char)); strcpy(head->paths[letter]->setn,head->setn); head->paths[letter]->setn[strlen(head->setn)]=word[i]; head->paths[letter]->setn[strlen(head->setn)+1]='\0'; head->paths[letter]->isWord=0; head=head->paths[letter]; Any help is greatly appreciated. Expand|Select|Wrap|Line Numbers #include
of these signals are indications that your program is seriously broken in some way, and there’s usually no way to continue the computation which encountered the error. Some programs handle program error signals in order to tidy up before terminating; for example, programs that turn off echoing of terminal input should handle program error signals in order to turn echoing back on. The handler should end by specifying the default action for the signal that happened and then reraising it; this will cause the program to terminate with that signal, as if it had not had a handler. (See Termination in Handler.) Termination is the sensible ultimate outcome from a program error in most programs. However, programming systems such as Lisp that can load compiled user programs might need to keep executing even if a user program incurs an error. These programs have handlers which use longjmp to return control to the command level. The default action for all of these signals is to cause the process to terminate. If you block or ignore these signals or establish handlers for them that return normally, your program will probably break horribly when such signals happen, unless they are generated by raise or kill instead of a real error. When one of these program error signals terminates a process, it also writes a core dump file which records the state of the process at the time of termination. The core dump file is named core and is written in whichever directory is current in the process at the time. (On GNU/Hurd systems, you can specify the file name for core dumps with the environment variable COREFILE.) The purpose of core dump files is so that you can examine them with a debugger to investigate what caused the error. Macro: int SIGFPE The SIGFPE signal reports a fatal arithmetic error. Although the name is derived from “floating-point exception”, this signal actually covers all arithmetic errors, including division by zero and overflow. If a program stores integer data in a location which is then used in a floating-point operation, this often causes an “invalid operation” exception, because the processor cannot recognize the data as a floating-point number. Actual floating-point exceptions are a complicated subject because there are many types of exceptions with subtly different meanings, and the SIGFPE signal doesn’t distinguish between them. The IEEE Standard for Binary Floating-Point Arithmetic (ANSI/IEEE Std 754-1985 and ANSI/IEEE Std 854-1987