Freebsd Bus Error
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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 bus error c++ an operating system (OS) that a process is trying to access
Bus Error In Linux
memory that the CPU cannot physically address: an invalid address for the address bus, hence the name. In linux bus error core dumped 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
How To Debug 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] how to solve bus error in linux 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 access
sorted by: [ date ] [ thread ] [ subject ] [ author ] > -----Original Message----- > From:
Sigbus Error Linux
owner-freebsd-questions at freebsd.org > [mailto:owner-freebsd-questions at freebsd.org]On Behalf Of Vladimir Ch.
Bus Error Vs Segmentation Fault
> Sent: Sunday, March 16, 2008 12:51 AM > To: freebsd-questions at freebsd.org > Subject: "Bus bus error 10 mac error: 10 (core dumped)" on FreeBSD 7.0 > > > After upgrading to FreeBSD 7.0 some of the programs stopped working: when > trying to launch emacs or https://en.wikipedia.org/wiki/Bus_error sbcl I am getting "Bus error: 10". > Searching the internet revealed that this could be hardware problem - but > 6.2, 6.3 ran the same box before without any errors. Windows XP also works > on the same computer. > I use GENERIC kernel. Did you recompile every program on your system after you https://lists.freebsd.org/pipermail/freebsd-questions/2008-March/171152.html upgraded to 7.0 or did you just assume that the 6.3 binaries would run unmodified? See: http://www.freebsd.org/releases/7.0R/announce.html "...Updating Existing Systems An upgrade of any existing system to FreeBSD 7.0-RELEASE constitutes a major version upgrade, so no matter which method you use to update an older system you should reinstall any ports you have installed on the machine. This will avoid binaries becoming linked to inconsistent sets of libraries when future port upgrades rebuild one port but not others that link to it. This can be done with: # portupgrade -faP after updating your system. Note some of the tools to help with this or the instructions below for FreeBSD Update are not installed by default (e.g. portupgrade, gpg, or similar tools like portmaster..." Ted Previous message: kldload: unexpected relocation type 10 Next message: "Bus error: 10 (core dumped)" on FreeBSD 7.0 Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the freebsd-questions mailing list
echo $? 138 Wat. [1] This was on FreeBSD 10.0-RELEASE (amd64), after executing what I thought would be a routine pkg upgrade. The pkgs that were thusly upgraded had been built in a Poudriere bulk build just moments before. I was logged in as an LDAP user (via pam_ldap, nss_ldap, and openldap-client) and using bash as my shell. New SSH logins to LDAP users still worked and sudoers could still sudo, so I knew at least that PAM, the LDAP client, and sudo weren’t completely hosed. Other commands I tried worked as expected — the misbehavior only manifested when I ran sudo. Things started making a bit more sense when I discovered that local users (including root) could sudo without the bus error occurring. This narrowed my issue down to the LDAP client stack, which in my experience is constantly looking for new and troubling ways to mysteriously break. I shouldn’t have been surprised. In the end, I just forcibly rebuilt the packages for the LDAP client stack and then forcibly upgraded them on the client, after which the bus errors stopped happening. I’m inferring that somewhere along the way, a package didn’t get linked against the right library on the Poudriere server or a package didn’t upgrade on the client. On FreeBSD machines that build their own pkgs through ports, I’m in the habit of recursive and forcible portupgrades when upgrading the LDAP client stack, but this experience shows that developing similar habits when using newer methods like Poudriere + pkg upgrade would be worthwhile. [1] Before you speak up, I know what a bus error is, but just haven’t managed to provoke one on this architecture before — much less by accident. Posted by Bethany Long Nov 23rd, 2014 Tweet « Puppet errors on FreeBSD: uninitialized class variable @@lock in Object Yesteryear » Recent Posts Fre