Bus Error Coredump
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Debug Bus Error
minute: Sign up What is a bus error? up vote 155 down 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
Bus Error In Aix
at 10:44 Cool Guy 15.8k51952 asked Oct 17 '08 at 14:48 raldi 7,239216178 add a comment| 15 Answers 15 active oldest votes up vote 150 down vote accepted Bus errors are rare nowadays on x86 and occur when your 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 bus error core dumped solaris 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 5,70322336 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 5 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 malloc, and then write to enough of it and you'll get a bus error. –Eloff Jul 14 '15 at 0:09 add a comment| up vote 55 down vote A segfault is accessing memory that you're not allowed to access. It's read-only, you don't have permission, etc... A bus error is trying to access memory that can't possibly be there. You've used an address that's meaningless to the system, or the wrong kind of address for that operation. share|improve this answer answered Oct 17 '08 at 14:55 Clinton Pie
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Bus Error Core Dumped Linux
Tag Search Advanced Search Unanswered Threads Find All Thanked Posts Go to Page... python bus error core dumped learn unix and linux commands Bus error(coredump UNIX for Dummies Questions & Answers Thread Tools Search this Thread Display Modes core dump error in windows 7 #1 06-30-2005 Student37 Registered User Join Date: Aug 2003 Last Activity: 23 February 2009, 6:53 PM EST Location: NJ Posts: 39 Thanks: 0 Thanked 0 Times in 0 Posts Bus error(coredump aix 5.3 ML1 http://stackoverflow.com/questions/212466/what-is-a-bus-error system was functioing well, when suddenly telnet session hung and then I got the following message "Bus error(coredump)" would appreciate if anyone would assist as to what to do next. Remove advertisements Sponsored Links Student37 View Public Profile Find all posts by Student37 #2 06-30-2005 google Advisor Join Date: Jul 2002 Last Activity: 17 June 2009, 5:17 PM EDT Location: Atlanta Posts: 740 Thanks: 0 Thanked 3 Times in 2 Posts http://www.unix.com/unix-for-dummies-questions-and-answers/19865-bus-error-coredump.html first thing to do is find out what core dumped. Was it telnet or something else? Your troubleshooting starts there. If you have the core file, and you are skilled in debugging/viewing core files (or have someone in your team/office) then start there. That file will give you the source line before the core occurred Remove advertisements Sponsored Links google View Public Profile Visit google's homepage! Find all posts by google #3 06-30-2005 TioTony Bit Pusher Join Date: Oct 2001 Last Activity: 4 October 2016, 2:50 PM EDT Location: Southern California Posts: 348 Thanks: 0 Thanked 3 Times in 3 Posts Also check 'errpt' and the code on the front of the box. I've seen this with bad sysplanars. TioTony View Public Profile Find all posts by TioTony #4 07-01-2005 Student37 Registered User Join Date: Aug 2003 Last Activity: 23 February 2009, 6:53 PM EST Location: NJ Posts: 39 Thanks: 0 Thanked 0 Times in 0 Posts appreciate the response. I do try errpt and output is marmaduke--root::/>errpt ksh: errpt: 0403-006 Execute permission denied. also tried a snap utility with the following commands that i read up, that too gave the same message. marmaduke--root::/>snap -gfkDNGL ksh: errpt: 0403-006 Execute permission denied. Iam reading through some more papers, will let you know. Remove advertisements Sponsored Link
program yourself, you can skip the rest of this section. For College-supported software, you can report the bug by contacting a consultant through olc or "mail staff". ------------------------------------------------------------------------------- If http://www.glue.umd.edu/afs/glue.umd.edu/system/info/olh/Utilities/Unix_answers/unix_bus_or_seg.html the program displays this message: Bus error or Segmentation fault or Core dump https://community.hpe.com/t5/System-Administration/Bus-error-coredump-when-running-a-script-that-contains-sql/td-p/2453029 ... then the program was trying to access a memory location outside its address space. The computer detected this problem and sent a signal to your program, which caused it to abort. Things that cause bus errors and segmentation violations are typically out-of-bounds array references and/or references through uninitialized or mangled pointers. Look very closely bus error in your program for bizarre things like that. A common example in C is: int c; scanf("%d", c); instead of the correct version: int c; scanf("%d", &c); An example from C++ is: int* p=new int[100]; cout<< p[100]; instead of the correct version: int* p=new int[100]; cout << p[99] (remember array referances in C and C++ start with 0 ) There are a number of methods for finding out where bus error core the program went out of bounds. One method is to use printf() statements to determine how far the program is getting before it crashes, and to print out the contents of interesting variables. A more sophisticated method is using 'dbx', a source level symbolic debugger. C and C++ programmers can also use 'gdb'. To learn about 'dbx', you can read the manual pages by using the 'man' command, as in: man dbx To learn about 'gdb', you can read the manual node in the 'xinfo' program, or using 'M-x info' in Emacs. If you need to debug your program, you may want to enable a core dump. Usually, those two messages above would also have "(core dumped)" by them, indicating that the program wrote an image of its current memory into a file called "core" in that directory. You might want to type 'fs lq' and find out how many blocks (kilobytes) you have available in your quota. Then you can type, say: limit coredumpsize 100 .. to limit your core dump size to 100K for your current login. BE CAREFUL not to let yourself go over quota, as you would then not be able to create or edit files. You should delete
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