Difference Between Bus Error Segmentation Fault
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C Error Segmentation Fault
Illegal...? UNIX for Dummies Questions & Answers Thread Tools Search this Thread Display Modes #1 03-28-2008 lakeat Registered User Join Date: Sep 2007 Last Activity: 16 May 2008, 11:01 PM
Runtime Error Segmentation Fault
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 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 bus error c++ 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 SIGILL and is usually signal 4) - This usually means that your program is trying to execute garbage or a privileged instruction. You might encounter this - (a.) when you try to execute data (b.) when you try to execute a corrupted executed file. (c.) stack overflows (d.) when the system has trouble running the handler for a signal HTH Remove advertisements Sponsored Links ajitabhpandey View Public Profile Visit ajitabhpandey's homepage!
the difference between a bus error and a segmentation fault?UpdateCancelAnswer Wiki2 Answers Abhinav Jangda, Computer Science Reseacher at IISc, Glasgow and CMU Research InternWritten 147w agoBus Error occurs when Processor cannot attempt to access
Bus Error Linux
the memory area requested.Segmentation Fault occurs when Processor tries to access a memory area how to debug bus error which doesn't belongs to current process.468 Views · View UpvotesRelated QuestionsMore Answers BelowWhat is the difference between bus error and bus error ubuntu segmentation core dumped and where do they both exist?Is 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 http://www.unix.com/unix-for-dummies-questions-and-answers/58727-whats-difference-between-segmentation-fault-bus-error-illegal.html are some of the best/must read articles for debugging segmentation faults in C++? Shravan Kumar, Writes code for foodWritten 98w 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 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 https://www.quora.com/What-is-the-difference-between-a-bus-error-and-a-segmentation-fault a multiple of 4).Reference : Aka Stack Overflow351 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 they both exist?Is there any difference between segmentation fault and dangling pointer?Why is this showing
- according to siginfo.h(3head) By Peteh-Oracle on Dec 08, 2006 Having asked a number of colleagues I failed to find a consistent answer to the question of the differences between SIGBUS and SIGSEGV. https://blogs.oracle.com/peteh/entry/sigbus_versus_sigsegv_according_to According to the Solaris signal(3head) man page we have: Name Value Default Event http://unix.ittoolbox.com/groups/technical-functional/unixadmin-l/what-is-the-difference-between-a-segfault-bus-error-5221544 ... SIGBUS 10 Core Bus Error SIGSEGV 11 Core Segmentation Fault So I dug a bit further and found that siginfo_t can tell you more about the origins of the signal, in particular we have, from the siginfo.h(3head) man page: Signal Code Reason _________________________________________________________________________ ... _________________________________________________________________________ SIGSEGV SEGV_MAPERR address not mapped to object SEGV_ACCERR bus error invalid permissions for mapped object _________________________________________________________________________ SIGBUS BUS_ADRALN invalid address alignment BUS_ADRERR non-existent physical address BUS_OBJERR object specific hardware error _________________________________________________________________________ Obviously this may be open to interpretation but that clarifies a few things for me. For the techie take a look at the OpenSolaris source code for the trap() function. Here we see the handling for various types of trap including page faults. For example, there's a error segmentation fault section where a decision is made as to return SIGBUS or SIGSEGV: case T_WIN_OVERFLOW + T_USER: /\* window overflow in ??? \*/ case T_WIN_UNDERFLOW + T_USER: /\* window underflow in ??? \*/ case T_SYS_RTT_PAGE + T_USER: /\* window underflow in user_rtt \*/ case T_INSTR_MMU_MISS + T_USER: /\* user instruction mmu miss \*/ case T_DATA_MMU_MISS + T_USER: /\* user data mmu miss \*/ case T_DATA_PROT + T_USER: /\* user data protection fault \*/ switch (type) { ... /\* \* In the case where both pagefault and grow fail, \* set the code to the value provided by pagefault. \*/ (void) instr_size(rp, &addr, rw); bzero(&siginfo, sizeof (siginfo)); siginfo.si_addr = addr; if (FC_CODE(res) == FC_OBJERR) { siginfo.si_errno = FC_ERRNO(res); if (siginfo.si_errno != EINTR) { siginfo.si_signo = SIGBUS; siginfo.si_code = BUS_OBJERR; fault = FLTACCESS; } } else { /\* FC_NOMAP || FC_PROT \*/ siginfo.si_signo = SIGSEGV; siginfo.si_code = (res == FC_NOMAP) ? SEGV_MAPERR : SEGV_ACCERR; fault = FLTBOUNDS; } I was digging around this following a discussion regarding bug 6466257 (mmap file writing fails on nfs3 client with EMC nas device) and the signals delivered by mmap(2). The man page suggests that either SIGBUS or SIGSEGV can be returned for a number of error condition
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