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What would cause a bus error? All this due to #GP being raised, which almost always maps to SIGSEGV. The short answer is yes. There's no consensus between different operating systems what it should mean and when it is generated varies wildly between operating systems, cpu architectures, configuration and the phase of the moon. this contact form

because it has disappeared (e.g. Thanks. –Josh Kelley Jan 19 '10 at 13:20 add a comment| up vote 2 down vote Oh yes there's one more weird way to get SIGBUS. You might have better luck with loading a known-invalid address into a pointer and dereferwncing that. up vote 156 down vote favorite 49 What does the "bus error" message mean, and how does it differ from a segfault?

Bus Error C++

Your Comment: HTML Syntax: NOT allowed About Peteh-Oracle Search Enter search term: Search filtering requires JavaScript Recent Posts http://blogs.sun.com/peteh has been migrated to http://pgharvey.wordpress.com/ How people actually develop - 70/20/10 rule In contrast SIGBUS basically meant that you were trying to use an address which was illegal (i.e. POSIX has the concept of "safe function".

  • A bus error is trying to access memory that can't possibly be there.
  • In various fields of research (perhaps wider), the slang "bus error" has a different meaning, which I think could be a relevant answer.
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  • Multiple instances of real-time signals can be queued.
  • You didn't mention in your question what it was you were actually trying to acheive.
  • What would have been the behavior on a non-buggy OS? –Calvin Huang Feb 17 '14 at 0:55 add a comment| up vote 3 down vote One classic instance of a bus
  • memory management deadlocks (and other "something went horribly wrong, but we don't know what" memory management errors).
  • There are two signals that can be delivered to a process that attempts something with an illegal memory address: SIGBUS (ksh will say Bus error(coredump)) SIGSEGV (ksh will say Memory fault(coredump))
  • I've verified that this causes a bus error on both openSUSE 11.1 and Darwin 10.2.0 (i.e.

You set up an uint8_t array, add one, two, or three to the array's pointer and then typecast to a short, int, or long and try to access the offending result.) There is no need to even attempt to convert the virtual address to a physical address. You've used an address that's meaningless to the system, or the wrong kind of address for that operation. Bus Error Vs Segmentation Fault For details of in-depth Linux/UNIX system programming training courses that I teach, look here.

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 Bus Error Linux more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Mac OS x 10.6.2). –R Samuel Klatchko Jan 15 '10 at 6:56 I know this is an old thread but.. http://stackoverflow.com/questions/838540/bus-error-vs-segmentation-fault Systems tolerate this inefficient algorithm, as it is an essential feature for most software, especially string processing.

using an uninitialized hence bogus pointer. Linux Bus Error Core Dumped C programming Hot Network Questions Should non-native speakers get extra time to compose exam answers? mov 0(%rbp), %rdx instruction and the address 0x706a2e3630332d69 were copied from a coredump of the buggy program. This limit can be viewed and (with privilege) changed via the /proc/sys/kernel/rtsig-max file.

Bus Error Linux

accessing a memory-mapped file or executing a binary image which has been truncated while the program was running),[2] or because a just-created memory-mapped file cannot be physically allocated, because the disk http://stackoverflow.com/questions/2069450/how-to-get-a-bus-error exec of non-exec mapping access to perfectly valid mapping, but overcommitted memory couldn't be faulted in at this moment (I've seen SIGSEGV, SIGKILL and SIGBUS here, at least one operating system Bus Error C++ Each read(2) from this file descriptor blocks until one of the signals in the set specified in the signalfd(2) call is delivered to the caller. Sigbus Error Linux Now, here're some ways to get SIGBUS due to a CPU exception: Enable AC bit in EFLAGS, then do unaligned access by any memory read or write instruction.

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share|improve this answer answered Jan 15 '10 at 6:10 ephemient 119k26178303 Nice find. Check this code which has a mis-aligned pointer dereference: #include int main(int argc, char \*\*argv) { int testvar = 0x12345678; int \*testvarp; testvarp = &testvar; printf("testvarp was %lx\\n", testvarp); printf("testvar Where I can learn Esperanto by Spanish? navigate here asked 8 years ago viewed 157202 times active 20 days ago Get the weekly newsletter!

Your program will probably only see SIGTRAP if it is somehow executing bad instructions. How To Solve Bus Error In Linux c++ bus-error share|improve this question edited Jan 15 '10 at 9:50 asked Jan 15 '10 at 4:06 Lazer 25.2k66212311 2 What platform and hardware architecture are you using? –R Samuel In a traditional single-threaded application, sigprocmask(2) can be used to manipulate the signal mask.

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It normally results in #GP, which maps to SIGSEGV. –Ruslan Jan 22 at 9:02 1 Pardon me, you're right. –Mischa Jan 23 at 23:15 add a comment| up vote 1 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. Is the ability to finish a wizard early a good idea? Bus Error Python Signal Value Action Comment ────────────────────────────────────────────────────────────────────── SIGHUP 1 Term Hangup detected on controlling terminal or death of controlling process SIGINT 2 Term Interrupt from keyboard SIGQUIT 3 Core Quit from keyboard SIGILL

Thus it cannot protect you from overwriting memory within the same program. The negative address space is used by the kernel. –Art Jan 26 at 10:13 @Art Yes, 0x800000000000-0xffffffffffff is used by the kernel, but are you sure it is sensible The answer, I believe, is yes - but quite often the result is the same which is to fix the code Category: Solaris Tags: opensolaris programming sigbus signals sigsegv solaris Permanent his comment is here This is an example of register indirect addressing.

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