Bus Error On Data Reference
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Bus Error C++
Sign up What is a bus error? up vote 155 down 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
Bus Error Linux
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 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 bus error core dumped 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 segfault is accessing memory that you're not allowed to access. It's read-only, you don't have permission, etc... A bus error is trying to access memory that can't possibly be there. You've used an address that's meaningless to the system, or the wrong kind of address for that operation. share|improve this answer answered Oct 17 '08 at 14:55 Clinton Pierce 6,88394576 ad
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Bus Error 10 Mac
Elegant Mobile Home » All Forums » [32-Bit Microcontrollers] » General PIC32 Topics fortran bus error » EXCEP_DBE, // bus error (load/store) Mark Thread UnreadFlat Reading Mode❐ LockedEXCEP_DBE, // bus error (load/store) Author Post Essentials python bus error Only Full Version HaroldHallikainen Super Member Total Posts : 484 Reward points : 0 Joined: 2003/11/07 12:36:50 Status: offline 2011/05/27 21:01:53 (permalink) 0 EXCEP_DBE, // bus error (load/store) I'm occasionally getting http://stackoverflow.com/questions/212466/what-is-a-bus-error these exceptions and can't figure out why. It seems to come and go, and I'm not sure why. According to the debugger, as I single step through the assembly code, it's happening in one line of vfprintf(), which is being called from fprintf(). There have been no changes in this area of the code, though I have made changes in other areas.So, http://www.microchip.com/forums/m580839.aspx what typically causes the DBE exception?Thanks!Harold FCC Rules updated daily at http://www.hallikainen.com #1 4 Replies Related Threads frostmeister Super Member Total Posts : 769 Reward points : 0 Joined: 2006/12/03 10:20:52Location: UK Status: offline Re:EXCEP_DBE, // bus error (load/store) 2011/05/28 02:33:20 (permalink) 0 Transfers to a null pointer / invalid memory address. Are you using the exception handler provided in the microchip examples, that overrides the normal weak handler? If so, you should get an address along with the DBE error, that points to the line of code that caused the error, when checked in thedisassemblyview. If you breakpoint a few lines before the error, and check that any pointers being used are pointing to the correct areas of memory, that should catch it. #2 HaroldHallikainen Super Member Total Posts : 484 Reward points : 0 Joined: 2003/11/07 12:36:50 Status: offline Re:EXCEP_DBE, // bus error (load/store) 2011/05/31 11:55:36 (permalink) 0 Digging through the disassembled code is a pain, but the error is, as pointed out above, happening in vfprintf(). I started undoing my latest code changes to see what change makes the error occur. I hav