Debug Bus Error Solaris
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I'm not pointing my finger at gcc here, this is a Sun gotcha).Here's an example program (simplified for something much more complex that I was debugging), unix bus error that illustrates how memory alignment on SPARC systems can bite you if you linux bus error are doing low-level things in C. In the example the program allocates space for a thing structure which will oracle bus error be prepended with a header. The header structure has a dummy byte array called data which will be used to reference the start of the thing.struct thing { int an_int;};struct header {
Bus Error (core Dumped) Linux
short id; char data[0];};struct header * maker( int size ) { return (struct header *)malloc( sizeof( struct header ) + size );}int main( void ) { struct header * a_headered_thing = maker( sizeof( struct thing ) ); struct thing * a_thing = (struct thing *)&(a_headered_thing->data[0]); a_thing->an_int = 42;}If you build this on a SPARC machine you'll get the following error when you run it:Bus Error bus error (core dumped) c (core dumped)Annoyingly, if you build a debugging version of this program the problem magically goes away and doesn't dump core in the debugger. So you either resort to printf-style debugging or going into gdb and looking at the assembly output.Here's what happens when you run this in gdb (non-debug code):(gdb) runProgram received signal SIGSEGV, Segmentation fault.0x000106d8 in main ()Since you can't get back to the source we're forced to do a little disassembly:(gdb) disassembleDump of assembler code for function main:0x000106b0
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 physically bus error (core dumped) centos address: an invalid address for the address bus, hence the name. In modern use on
Bus Error Core Dumped C++
most architectures these are much rarer than segmentation faults, which occur primarily due to memory access violations: problems in the logical address or
Bus Error Core Dumped In Unix
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, though a http://blog.jgc.org/2007/04/debugging-solaris-bus-error-caused-by.html 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 a specific physical https://en.wikipedia.org/wiki/Bus_error 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 therefore accessible, and all addresses in
& Answers This forum is closed for new posts. Please post beginner questions to learn unix and learn linux in this forum UNIX for Beginners Questions & Answers Search Forums Show Threads http://www.unix.com/unix-for-dummies-questions-and-answers/3109-bus-error.html Show Posts Tag Search Advanced Search Unanswered Threads Find All Thanked Posts Go to Page... linux operating commands and unix operating commands Bus Error UNIX for Dummies Questions & Answers Thread http://www.imagemagick.org/discourse-server/viewtopic.php?t=13796 Tools Search this Thread Display Modes #1 11-09-2001 LivinFree Goober Extraordinaire Join Date: Jul 2001 Last Activity: 16 June 2011, 4:50 PM EDT Location: Portland, OR, USA Posts: 1,626 Thanks: 2 Thanked bus error 15 Times in 13 Posts Bus Error This may belong in the C Programming forum, but here goes anyway... What would cause a bus error? I searched google for a cause, but came up with some conflicting reports... Could it be caused by [lack of] disk space? A lot of the pages I found mentioned linking with the incorrect versions of the library. But in that case, would it compile correctly? Basically, bus error (core I am curious as to why we had a job dump core on a bus error. It ran nearly to normal completion time, then simply poo-pood. In the case that it may make a difference, it's a job that interfaces with an Oracle database on HP-UX 11. The things that had changed were that the process was recompiled, AND we were at 96% (df -k) on that disk... Not too important for me to know right now, but I am curious, and who wants to wait for developers to tell me what happened? Remove advertisements Sponsored Links LivinFree View Public Profile Find all posts by LivinFree #2 11-09-2001 Perderabo Unix Daemon (Administrator Emeritus) Join Date: Aug 2001 Last Activity: 26 February 2016, 12:31 PM EST Location: Ashburn, Virginia Posts: 9,931 Thanks: 64 Thanked 462 Times in 267 Posts The bus in question is the address buss and it contains an illegal value. This is almost always the result of dereferencing a pointer that contains an illegal value. Here is a program that, I think, will compile with every C or C++ compiler, but should cause a bus error when the second printf is attempted... Code: #ifdef __STDC__ #define PROTOTYPICAL #endif #ifdef __cplusplus #define PROTOTYPICAL #endif #include Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here. Post Reply Print view Search Advanced search 8 posts • Page 1 of 1 Gio Bus error (core dumped). Solaris 9 Quote Postby Gio » 2009-05-18T03:05:30-07:00 Hello, I try to use convert on my Server, but I recive a core dump. imdas@paros/usr/local/imdas/ImdasImport/bin $convert test.tif test.jpgBusfehler (core dumped)I have read this topic, but this don't help me.viewtopic.php?f=3&t=13654&start=0I'm a new user. I don't know ImageMagick good. I have a core file, but I don't know, how I can uploaded it. Can you help me?Thank youGioimdas@paros/usr/local/imdas/ImdasImport/bin $identify -versionVersion: ImageMagick 6.5.1-0 2009-04-09 Q16 http://www.imagemagick.orgCopyright: Copyright (C) 1999-2009 ImageMagick Studio LLCimdas@paros/usr/local/imdas/ImdasImport/bin $identify -list configurePath: /usr/local/lib/ImageMagick-6.5.1/config/configure.xmlName Value-------------------------------------------------------------------------------CC gcc -std=gnu99CFLAGS -O2 -I/usr/local/rrdtool-1.2.19/include -Wall -W -D_REENTRANT -pthreadsCONFIGURE ./configure 'CC=gcc' 'CFLAGS=-O2 -I/usr/local/rrdtool-1.2.19/include' 'LDFLAGS=-L/usr/local/lib -R/usr/local/lib -R/usr/lib -L/usr/lib -L/usr/openwin/lib -R/usr/openwin/lib -L/usr/local/ssl/lib -R/usr/local/ssl/lib -L/usr/local/BerkeleyDB.4.2/lib -R/usr/local/BerkeleyDB.4.2/lib' 'LIBS=-liconv' 'CPPFLAGS=-DNDEBUG -I/usr/local/ssl/include -I/usr/local/BerkeleyDB.4.2/include -I/usr/local/include/ncurses -I/usr/openwin/include -I/usr/local/rrdtool-1.2.19/include' 'CXX=g++' 'CXXFLAGS=-fpermissive -felide-constructors'COPYRIGHT Copyright (C) 1999-2009 ImageMagick Studio LLCCPPFLAGS -I/usr/local/include/ImageMagickCXX g++CXXFLAGS -fpermissive -felide-constructors -Wall -W -D_REENTRANT -pthreadsDEFS -DHAVE_CONFIG_HDELEGATES bzlib fontconfig freetype jpeg lcms png rsvg tiff x11 xml zlibDISTCHECK_CONFIG_FLAGS 'CC=gcc' 'CFLAGS=-O2 -I/usr/local/rrdtool-1.2.19/include' 'CPPFLAGS=-DNDEBUG -I/usr/local/ssl/include -I