Powerpc Bus Error
Contents |
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn
Bus Error C
more about Stack Overflow the company Business Learn more about hiring developers or bus error linux posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow bus error vs segmentation fault Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What is a bus error? up vote 156 down
How To Fix Bus Error In Linux
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 15.7k51952 asked Oct 17 '08 at 14:48 raldi 7,272216178 add a comment| 15 Answers 15 active oldest votes up vote 152 down vote accepted Bus errors are rare nowadays on x86 and occur when your
Bus Error Ubuntu
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 5,75322336 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 6 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 ma
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 bus error python operating system (OS) that a process is trying to access memory
How To Debug Bus Error
that the CPU cannot physically address: an invalid address for the address bus, hence the name. In modern bus error (core dumped) linux 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 POSIX-compliant platforms, http://stackoverflow.com/questions/212466/what-is-a-bus-error 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 errors may https://en.wikipedia.org/wiki/Bus_error 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 access individual bytes from each memory address, but
person Affects Status Importance Assigned to Milestone xserver-xorg-video-ati (Ubuntu) Edit Invalid Undecided Unassigned Edit You https://bugs.launchpad.net/bugs/614137 need to log in to change this bug's status. Affecting: xserver-xorg-video-ati (Ubuntu) Filed here by: Craig Blake When: 2010-08-06 Completed: 2015-08-28 Target Distribution Baltix BOSS Juju Charms Collection Elbuntu Guadalinex Guadalinex Edu Kiwi Linux nUbuntu PLD Linux Tilix tuXlab Ubuntu Ubuntu Linaro Evaluation Build Ubuntu RTM Package (Find…) Project bus error (Find…) Status Importance Invalid Undecided Assigned to Nobody Me Comment on this change (optional) Email me about changes to this bug report Also affects project (?) Also affects distribution/package Nominate for series Bug Description Binary package hint: xorg Attached is the output of the command "sudo Xorg -configure" which results powerpc bus error in a "Bus error" message. X windows fails to start on this machine with a default 10.04 server install. I am happy to provide more logs or do more tests as needed. ProblemType: Bug DistroRelease: Ubuntu 10.04 Package: xorg 1:7.5+5ubuntu1 ProcVersionSignature: Ubuntu 2.6.32-21.32-powerpc 2.6.32.11+drm33.2 Uname: Linux 2.6.32-21-powerpc ppc Architecture: powerpc Date: Thu Aug 5 20:26:50 2010 DkmsStatus: Error: [Errno 2] No such file or directory GdmLog: Error: command ['sudo', 'cat', '/var/log/gdm/:0.log'] failed with exit code 1: cat: /var/log/gdm/:0.log: No such file or directory GdmLog1: Error: command ['sudo', 'cat', '/var/log/gdm/:0.log.1'] failed with exit code 1: cat: /var/log/gdm/:0.log.1: No such file or directory GdmLog2: Error: command ['sudo', 'cat', '/var/log/gdm/:0.log.2'] failed with exit code 1: cat: /var/log/gdm/:0.log.2: No such file or directory InstallationMedia: Ubuntu-Server 10.04 LTS "Lucid Lynx" - Release powerpc (20100428) ProcCmdLine: root=/dev/hda3 ro quiet splash ProcEnviron: LANG=en_US.UTF-8 SHELL=/bin/bash RelatedPackageVersions: xserver-xorg 1:7.5+5ubuntu1 libgl1-mesa-glx 7.7.1-1ubuntu3 libdrm2 2.4.18-1ubuntu3 xserver-xorg-video-ati 1:6.13.0-1ubuntu5 xserver-xorg-video-nou
be down. Please try the request again. Your cache administrator is webmaster. Generated Mon, 24 Oct 2016 11:31:51 GMT by s_wx1011 (squid/3.5.20)