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is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What is a bus error? up vote 154 down vote favorite 49 bus error core dumped 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 15.8k51952 asked Oct 17 '08 at 14:48 raldi 7,226216178 add a comment| 15 Answers 15 active oldest votes up vote 149 down vote accepted Bus errors are rare nowadays on x86 and occur when your processor cannot even attempt bus error 10 mac 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 5,68322336 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'l
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Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes http://stackoverflow.com/questions/212466/what-is-a-bus-error a minute: Sign up Bus error vs Segmentation fault up vote 25 down vote favorite 8 Difference between a bus error and a segmentation fault? Can it happen that a program gives a seg fault and stops for the first time and for the second time it may give a bus error and exit ? c share|improve this question edited May 2 http://stackoverflow.com/questions/838540/bus-error-vs-segmentation-fault '12 at 12:04 casperOne 57.9k10126202 asked May 8 '09 at 6:56 Thunderboltz 6203915 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 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 t
challenged and removed. (July 2015) (Learn how and when to remove this template message) In computing, a bus error is a fault raised by hardware, notifying an operating system https://en.wikipedia.org/wiki/Bus_error (OS) that a process is trying to access memory that the CPU cannot physically address: an invalid address for the address bus, hence the name. In modern use on most http://www.paraview.org/pipermail/paraview/2005-August/001876.html architectures these are much rarer than segmentation faults, which occur primarily due to memory access violations: problems in the logical address or permissions. On POSIX-compliant platforms, bus errors usually result bus error in the SIGBUS signal being sent to the process that caused the error. SIGBUS can also be caused by any general device fault that the computer detects, though a bus error rarely means that the computer hardware is physically broken—it is normally caused by a bug in a program's source code.[citation needed] Bus errors may also be raised for certain other bus error 10 paging errors; see below. Contents 1 Causes 1.1 Non-existent address 1.2 Unaligned access 1.3 Paging errors 2 Example 3 References Causes[edit] There are at least three main causes of bus errors: Non-existent address[edit] Software instructs the CPU to read or write a specific physical memory address. Accordingly, the CPU sets this physical address on its address bus and requests all other hardware connected to the CPU to respond with the results, if they answer for this specific address. If no other hardware responds, the CPU raises an exception, stating that the requested physical address is unrecognized by the whole computer system. Note that this only covers physical memory addresses. Trying to access an undefined virtual memory address is generally considered to be a segmentation fault rather than a bus error, though if the MMU is separate, the processor can't tell the difference. Unaligned access[edit] Most CPUs are byte-addressable, where each unique memory address refers to an 8-bit byte. Most CPUs can access individual bytes from each memory address, but they generally cannot access larger units (16 bits, 32 bits, 64
after tetrahedralizing mesh for volume visualization - bus error on IRIX 6.5 and latest stable ParaView Next message: [Paraview] Stream lines crash on large dataset Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Dear ParaView List - I've been attempting to debug the problem I have been having with ParaView crashing when trying to volume visualize large grids; unfortunately I'm ending up with more questions than answers :) I am creating a mesh within GAMBIT, running a simulation in FLUENT and then exporting the data in Ensight Gold format. I remeshed the original geometry with all tetrahedrons and then imported the dataset into ParaView; however, the same error (non-tetrahedral cell encountered) occurred and ParaView died shortly thereafter with the same error as before (bus error). After reading through the docs for vtkProjectedTetrahedraMapper, I was wondering if the bus error indicates a problem interfacing with the SGI graphics board with openGL - could a non-tet cell cause a bus error in this situation? Is it possible to select an alternate volume visualization method for ParaView to use other than vtkProjectedTetrahedraMapper? I noticed ParaView ran vtkDatasetTriangleFilter on the data even though it was all tets / tris at the beginning. Does ParaView always call vtkDatasetTriangleFilter for all grids no matter what cell types are present prior to volume visualization? Can it be turned off if ones knows the cells are all tets? Thanks for any suggestions / advice that can be provided. I know other folks on the list use ParaView to postprocess CFD jobs run in FLUENT and I would be interested to hear if you have experienced the same or similar issues. Best regards - Ken Kenneth Gage MD-PhD Student McGowan Institute for Regenerative Medicine University of Pittsburgh 228 MCGOWN 3025 East Carson Street Pittsburgh, PA 15203-2155 Previous message: [Paraview] Paraview crashing after tetrahedralizing mes