Cuda Bus Error
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How To Debug Bus Error
Join them; it only takes a minute: 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 10:44 Cool Guy 15.8k51952 asked Oct 17 '08 at 14:48 raldi how to solve bus error in linux 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 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 5,71322336 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 whe
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 (OS) that a process is trying to access memory that the CPU cannot bus error vs segmentation fault physically address: an invalid address for the address bus, hence the name. In modern use
Bus Error (core Dumped) C
on most architectures these are much rarer than segmentation faults, which occur primarily due to memory access violations: problems in the logical
Sigbus Error Linux
address or permissions. On POSIX-compliant platforms, bus errors usually result 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, http://stackoverflow.com/questions/212466/what-is-a-bus-error 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 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 https://en.wikipedia.org/wiki/Bus_error 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 bits and so on) without these units being "aligned" to a specific boundary (the x86 platform being a notable exception). For example, if multi-byte accesses must be 16 bit-aligned, addresses (given in bytes) at 0, 2, 4, 6, and so on would be considered aligned and therefore accessible, while addresses 1, 3, 5, and so on would be considered unaligned. Similarly, if multi-byte accesses must be 32-bit aligned, addresses 0, 4, 8, 12, and so on would be considered aligned and the
Support Search GitHub This repository Watch 566 Star 11,004 Fork 1,567 jcjohnson/neural-style Code Issues 190 Pull requests 17 Projects 0 Wiki Pulse Graphs New issue Bus https://github.com/jcjohnson/neural-style/issues/232 error: 10 [OS X 10.10] #232 Open carlodelpizzo opened this Issue May 27, http://www.glue.umd.edu/afs/glue.umd.edu/system/info/olh/Utilities/Unix_answers/unix_bus_or_seg.html 2016 · 18 comments Projects None yet Labels None yet Milestone No milestone Assignees No one assigned 3 participants carlodelpizzo commented May 27, 2016 • edited Im on a Hackintosh, if that makes a difference? th neural_style.lua -gpu 0 -print_iter 1 … Successfully loaded models/VGG_ILSVRC_19_layers.caffemodel Bus error: 10 3DTOPO commented May 27, bus error 2016 I am able to run neural-style on Hackintosh. I just never got the CUDA stuff working. How much memory does your system have? carlodelpizzo commented May 27, 2016 16 GB RAM. I get the same bus error if i try with CUDA or not. I cant really tell, but the CUDA backend seems to be fine. I do have my home directory on bus error linux a different hard disk than my OS, but i dont think that would cause bus error? 3DTOPO commented May 27, 2016 As long as you are using -gpu 0 I think the CUDA stuff shouldn't matter. I was just mentioning for completeness. 3DTOPO commented May 27, 2016 Oops - I meant -gpu -1 to not use the GPU. carlodelpizzo commented May 27, 2016 Gotcha.. any idea where i can start troubleshooting this bus error? im at a total loss 3DTOPO commented May 27, 2016 I would say first try it with -gpu -1. Does that work? If it does, it likely has something to do with CUDA which I abandoned trying to get working and switched to Ubuntu instead. Here the thread my thread on it: #91 carlodelpizzo commented May 27, 2016 No it doesnt work that way either. I have tried "th neural_style.lua -gpu 0 -print_iter 50" "th neural_style.lua -style_image -content_image " "th neural_style.lua -gpu -1 -style_image -content_image -save_iter 50" If i try with sudo, it doesnt give me bus error. but doesnt do anything else either: 3DTOPO commented May 27, 2016 That means it worked without the GPU. The fa
program yourself, you can skip the rest of this section. For College-supported software, you can report the bug by contacting a consultant through olc or "mail staff". ------------------------------------------------------------------------------- If the program displays this message: Bus error or Segmentation fault or Core dump ... then the program was trying to access a memory location outside its address space. The computer detected this problem and sent a signal to your program, which caused it to abort. Things that cause bus errors and segmentation violations are typically out-of-bounds array references and/or references through uninitialized or mangled pointers. Look very closely in your program for bizarre things like that. A common example in C is: int c; scanf("%d", c); instead of the correct version: int c; scanf("%d", &c); An example from C++ is: int* p=new int[100]; cout<< p[100]; instead of the correct version: int* p=new int[100]; cout << p[99] (remember array referances in C and C++ start with 0 ) There are a number of methods for finding out where the program went out of bounds. One method is to use printf() statements to determine how far the program is getting before it crashes, and to print out the contents of interesting variables. A more sophisticated method is using 'dbx', a source level symbolic debugger. C and C++ programmers can also use 'gdb'. To learn about 'dbx', you can read the manual pages by using the 'man' command, as in: man dbx To learn about 'gdb', you can read the manual node in the 'xinfo' program, or using 'M-x info' in Emacs. If you need to debug your program, you may want to enable a core dump. Usually, those two messages above would also have "(core dumped)" by them, indicating that the program wrote an image of its curre