Bus Error In C Linux
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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 linux bus error core dumped system (OS) that a process is trying to access memory that the
Bus Error In Linux Terminal
CPU cannot physically address: an invalid address for the address bus, hence the name. In modern use on linux bus error message most 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
How To Solve Bus Error In Linux
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, 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 bus error c++ 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 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 (
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Bus Error In Linux
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How To Debug Bus Error
Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a bus error vs segmentation fault community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to get a “bus error”? up vote 12 down vote favorite 1 I am https://en.wikipedia.org/wiki/Bus_error trying very hard to get a bus error. One way is misaligned access and I have tried the examples given here and here, but no error for me - the programs execute just fine. Is there some situation which is sure to produce a bus error? c++ bus-error share|improve this question edited Jan 15 '10 at 9:50 asked Jan 15 '10 at 4:06 Lazer 24.9k65210309 2 What platform and hardware http://stackoverflow.com/questions/2069450/how-to-get-a-bus-error architecture are you using? –R Samuel Klatchko Jan 15 '10 at 5:32 it should be noted that by default x86 will not have a bus error, instead it will work but the memory access will be not as performant as an aligned read. on the other hand SPARC arches do have a bus error. –Evan Teran Jan 15 '10 at 6:50 1 No, see Michael Burr's comments and my answer. Even on x86, you can get a bus error by attempting to access memory which does not exist (as opposed to a segmentation fault, which comes from a violation of access policy). –ephemient Jan 16 '10 at 16:29 add a comment| 11 Answers 11 active oldest votes up vote 11 down vote accepted Bus errors can only be invoked on hardware platforms that: Require aligned access, and Don't compensate for an unaligned access by performing two aligned accesses and combining the results. You probably do not have access to such a system. share|improve this answer answered Jan 15 '10 at 4:09 Ignacio Vazquez-Abrams 444k63792950 is there some way to be sure of that? –Lazer Jan 15 '10 at 4:11 @eSKay: If you're using an Intel CPU, which means basically any personal computer nowa
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 https://en.wikipedia.org/wiki/Bus_error an operating system (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 architectures these are much rarer than segmentation faults, which occur primarily due to memory access violations: problems in the logical address or permissions. On bus error 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, 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 error in 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 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 a