Bus Error Segmentation Fault Difference
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C Error Segmentation Fault (core Dumped)
for the second time it may give a bus error and exit ? c share|improve this question edited May 2 '12 at 12:04 casperOne 58k10126202 asked May 8 '09 at 6:56 Thunderboltz 6253915 add a comment| 6 Answers 6 active oldest votes up vote 34 down vote accepted On most architectures I've used, the distinction is that: a SEGV is caused when you access memory you're not meant to (e.g., outside of your address space). a SIGBUS is caused due to alignment internal compiler error segmentation fault issues with the CPU (e.g., trying to read a long from an address which isn't a multiple of 4). share|improve this answer answered May 8 '09 at 7:06 paxdiablo 488k1179691416 10 Memory mapped files can also generate SIGBUS. –bk1e May 8 '09 at 16:06 on arm SIGBUS can occur if you read a float from an address that is not 4 byte aligned –shoosh Mar 30 at 7:29 shoosh, I'm pretty certain that's covered by my second bullet point. –paxdiablo Mar 30 at 13:28 add a comment| up vote 11 down vote SIGBUS will also be raised if you mmap() a file and attempt to access part of the mapped buffer that extends past the end of the file, as well as for error conditions such as out of space. If you register a signal handler using sigaction() and you set SA_SIGINFO, it may be possible to have your program examine the faulting memory address and handle only memory mapped file errors. share|improve this answer answered May 8 '09 at 16:04 bk1e 17.9k43760 add a comment| up vote 5 down vote For instance, a bus error might be caused when your program tries to do something that the hardware bus doesn't support. On SPARCs, for instance, trying to read a multi-byte value (such as an int, 32-bits) from an odd address generated a bus error. Segmentation faults happen for instance when you do an access that violate the segmentation
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learn unix and linux commands What's the difference between Segmentation fault and Bus error and Illegal...? UNIX for Dummies Questions & Answers Thread Tools Search this http://stackoverflow.com/questions/838540/bus-error-vs-segmentation-fault Thread Display Modes #1 03-28-2008 lakeat Registered User Join Date: Sep 2007 Last Activity: 16 May 2008, 11:01 PM EDT Location: Shanghai Posts: 12 Thanks: 0 Thanked 0 Times in 0 Posts What's the difference between Segmentation fault and Bus error and Illegal...? What's the difference between Segmentation fault and Bus error and Illegal instruction? Sometimes http://www.unix.com/unix-for-dummies-questions-and-answers/58727-whats-difference-between-segmentation-fault-bus-error-illegal.html I got the one, and sometimes i got another, what are their differences? Segmentation fault (core dump)? Bus error (core dump)? Illegal instruction (core dump) Thanks Daniel Remove advertisements Sponsored Links lakeat View Public Profile Find all posts by lakeat #2 03-28-2008 ajitabhpandey Registered User Join Date: Mar 2008 Last Activity: 23 October 2012, 11:42 PM EDT Location: Bangalore Posts: 15 Thanks: 0 Thanked 0 Times in 0 Posts Segmentation Fault (also known as SIGSEGV and is usually signal 11) - You can get this message when the program tries to write/read outside the memory allocated for it or when writing memory which can only be read Bus Error (also known as SIGBUS and is usually signal 10) - You can encounter this signal error when an invalid pointer is dereferenced i.e when you try to dereference an uninitialised pointer. It is similar to SIGSEGV but the difference is that SIGSEGV indicates an invalid access to valid memory, while SIGBUS indicates an access to an invalid address. Illegal Instructions (also known as
the difference between a bus error and a segmentation fault?UpdateCancelPromoted by Metavision.comStay on top of the latest augmented reality (AR) happeningsPokémon GO barely touched on AR's potential. Read these AR-related sites to keep up with the industryLearn https://www.quora.com/What-is-the-difference-between-a-bus-error-and-a-segmentation-fault More at Metavision.comAnswer Wiki2 Answers Abhinav Jangda, Computer Science Reseacher at IISc, Glasgow and CMU Research InternWritten 146w agoBus Error occurs when Processor cannot attempt to access the memory area requested.Segmentation Fault occurs when Processor http://forums.devshed.com/programming-42/difference-seg-fault-core-dump-bus-error-174417.html tries to access a memory area which doesn't belongs to current process.456 Views · View UpvotesRelated QuestionsMore Answers BelowWhat is the difference between bus error and segmentation core dumped and where do they both exist?Is segmentation fault there any difference between segmentation fault and dangling pointer?Why is this showing me segmentation fault?What is the difference between a segmentation fault and core dump?What are some of the best/must read articles for debugging segmentation faults in C++? Shravan Kumar, Writes code for foodWritten 97w agoOn most architectures I've used, the distinction is that:a SEGV is caused when you access memory you're not meant to (e.g., outside of your address error segmentation fault space).a SIGBUS is caused due to alignment issues with the CPU (e.g., trying to read a long from an address which isn't a multiple of 4).Reference : Aka Stack Overflow336 Views · View UpvotesView More AnswersRelated QuestionsWhy do I get Segmentation fault error when executing my code?Why am I getting a segmentation fault error in the following code?What is a segmentation fault?How do I troubleshoot segmentation fault problems?Why can't I initialize a pointer to NULL in my binary tree implementation code? How can I fix the segmentation fault error in my code?What is the difference between a syntax error, type error and end error?Why is my code showing segmentation fault?Learning to Program: What is the difference between run time error and compilation error?What is the difference between a compile-time (static) error and a (dynamic) run-time error?What is the difference between % error and % correction?What is the difference between an error and a fatal error?What is the difference between a syntax error and a logical error?Can you override a segmentation fault and crash a computer?What is the difference between error correction and detection?What is the difference between a logical error and a semantic error?Related QuestionsWhat is the difference between bus error and segmentation core dumped and where do the
Search Username Password Remember Me? Register Lost Password? facebook google twitter rss Free Web Developer Tools Advanced Search Forum Programming Languages C Programming difference between seg fault core dump bus error Thread: difference between seg fault core dump bus error Share This Thread Tweet This + 1 this Post To Linkedin Subscribe to this Thread Subscribe to This Thread August 14th, 2004,01:16 PM #1 No Profile Picture Technical View Profile View Forum Posts Registered User Devshed Newbie (0 - 499 posts) Join Date Aug 2004 Posts 1 Rep Power 0 difference between seg fault core dump bus error Hello C experts, Can I have 3 programs for producing the following errors ? 1. Segmentation fault 2. Core dump 3. Bus error I guess to get case one, *p='a' where p has not been allocated memory will do. How about the others ? Thanks in advance. Faq Reply With Quote August 14th, 2004,01:33 PM #2 DaWei_M View Profile View Forum Posts Visit Homepage Lord of Dorkness Devshed Supreme Being (6500+ posts) Join Date Jan 2004 Location Central New York. Texan via Arizona, out of his element! Posts 8,524 Rep Power 3316 1. Segmentation fault. Attempting to access memory in a segment one isn't allowed to access. 2. Core dump. Typically, an error which causes the OS to dump some contents of memory for trace purposes (often the stack). 'Core' was originally a memory technology which consisted of ferrite (magnetic) toroids with windings to set their direction of magnetization and a sense winding to read the current direction of magnetization. It generally just refers to any memory nowadays. The last core I used was a 256K module about 6 x 10 inches occupying the width of a couple PCI slots in today's PCs. 3. Bus Error. The most common cause is an invalid address alignment reference, although attempting to access a non-existent item at a particular bus address can also produce the fault. EDIT: Core in the original sense is non-volatile. It retains its contents when power is off, like CMOS, but doesn't need a battery