gcc debug bus error Voss Texas

Address 399 County Road 288, Ballinger, TX 76821
Phone (325) 365-4508
Website Link http://ddcnetworking.com

gcc debug bus error Voss, Texas

for (j = 0; i < n; j++) { for (i =0; i < m; i++) { a[n+1][j] += a[i][j]; } } Notice the 'inadvertent' usage of variable 'i' in the The first is to pad the header structure so that data is correctly aligned: adding 4 bytes of padding in the form of a short while make the problem go away:struct The same error occurs on hppa-linux but the exception is handled by the kernel unaligned handler. step Execute next program line (after stopping); step into any function calls in the line.

Physically locating the server Exploded Suffixes Security Patch SUPEE-8788 - Possible Problems? Often, these bugs manifest themselves in strange ways, such as the program printing interesting messages like "core dump" or "bus error" with no additional information. Paging errors[edit] FreeBSD, Linux and Solaris can signal a bus error when virtual memory pages cannot be paged in, e.g. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libiberty/ChangeLog.diff?cvsroot=gcc&r1=1.587&r2=1.588 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libiberty/md5.c.diff?cvsroot=gcc&r1=1.8&r2=1.9 Comment 4 Brian Dessent 2005-07-07 07:25:56 UTC This change breaks building Cygwin, and probably anything else that uses libiberty outside of gcc, because 'md5uint_ptr' is only defined in

An attempt to access memory that isn't physically present would also give a bus error, but you won't see this if you're using a processor with an MMU and an OS n: executes the next statement and then stops. It's not so much type conversion as you're doing type conversion on a pointer that you've done pointer math on. 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.

For instance: unsigned char data[6]; (unsigned int *) (data + 2) = 0xdeadf00d; This snippet tries to write the 32-bit integer value 0xdeadf00d to an address that is (most likely) not The operating system knows what hunk belongs to your process and what doesn't; if your process tries to access memory that it doesn't have the right to access, then it violates Look carefully at the code above. Is it plausible for my creature to have similar IQ as humans?

How to draw a path with coordinates defined by f(x) Are the words "expression" and "term" interchangeable in programming language theory? Compile your code with the -g option. This is my first post here. First check that all your pointers are at least initialised to NULL, if you don't initialise them when you declare them.

These approaches are not mutually exclusive and almost every programmer uses a combination of all three (plus others). Description Robert Parlett 2009-07-04 01:33:05 UTC $ gcc -v Using built-in specs. CPUs generally access data at the full width of their data bus at all times. SEE ALSO `gdb' entry in info; Using GDB: A Guide to the GNU Source- Level Debugger, Richard M.

Several of these commands have longer names that you can use as well: print for p, next for n, step for s, list for l, cont for c, and quit for The time now is 08:16 PM. The SPARC architecture insists that the data accesses by correctly aligned for the size of the access. 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).

print expr Display the value of an expression. p : prints the value of break :: causes the program to stop at a particular line in a particular source code file break : causes the program to stop The debugger program called gdb can help. share|improve this answer edited Oct 20 '12 at 16:16 md5 17.4k22069 answered Jun 26 '12 at 8:51 Vinaya Sagar 171 Heh...if this were the case, you'd have BUS error

Comment 2 CVS Commits 2005-07-03 15:38:44 UTC Subject: Bug 13906 CVSROOT: /cvs/gcc Module name: gcc Changes by: sje@gcc.gnu.org 2005-07-03 15:38:39 Modified files: include : ChangeLog ansidecl.h md5.h Log message: PR other/13906 Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this per- mission notice are preserved on all copies. C0Bus error: 10. With a little documentation around this it should be maintainable.

On ARM less than Arch V7, you will have your code have an alignment failure- and on V7, you can, IF your runtime is set for it, handle it with a If at first you don't succeed, try writing your phone number on the exam paper. 05-18-2007 #3 wuhua View Profile View Forum Posts Registered User Join Date May 2007 Posts 2 You just simply don't want to DO this. This GDB was configured as "sparc-sun-solaris2.9"... (gdb) run Starting program: /silver/home/gschoep/test/ipc/gdbtest/ba1 Bus error (core dumped) I am using gcc 3.3.2, gdb 6.0 Any ideas?

which functions have been called to get you where you are). The program sometimes (there is a random number generator in the codes) will crash with a message "bus error". I need my debugger! :> How I compile/link this app. 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

This is probably the single most useful thing you can have when something goes wrong. If you want to see the whole stack to help find out where the failing routine was called from etc you can use the bt command which backtraces the execution stack. I wish the C standard would include means of packing/unpacking larger integer types to/from a sequence of smaller integers/characters so as to let the compiler use whatever approach is best on Unfortunately > > this flag doesn't seem to make any difference to this case. > > -mno-faster-structs is the default. > If "-mno-faster-structs" is the default, then surely it shouldn't be

BUS errors are caused by an attempt to access "memory" that the machine simply cannot access because the address is invalid. (Hence the term "BUS" error.) This can be due to 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" Stallman and Roland H. current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list.

The Emacs-to-GDB interface pro- gram uses the two ` 32' characters as a signal to display the source code for the frame. -b bps Set the line speed (baud rate or You can trigger a BUS error/Alignment Trap if you do something silly like do pointer math and then typecast for access to a problem mode (i.e. It's basically an interpreter-like environment in which you can run your program line-by-line and do useful debugging tasks as well. operator do?1Bus error in simple C program1C++ pointers declaration order output segmentation fault or bus error3What error code does a process that segfaults return?0Bus Error in C for Loop0Bus Error, don't

I have been coding a program which handles many arrays of strings. The SPARC ABI requires union myblock to have 64-bit alignment because it contains a structure that has 64-bit alignment because it contains a double. Pesch. Debugging is a big subject, and we can only scratch the surface here.

Type "show warranty" for details. When a function calls another function, information about the new function being called is "pushed" onto a stack. Use a debugger to find out where your code went wrong. 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,

SOME ARMv7 systems will let you do this- but most ARM, MIPS, Power, etc. it's indeed plain undefined behaviour so a SIGBUS at run time is OK. > One other thing, there is a flag "-mno-faster-structs" which this page > suggests would prevent this sort It is possible for CPUs to support this, but this functionality is rarely required directly at the machine code level, thus CPU designers normally avoid implementing it and instead issue bus This code is undefined because of alignment requirments differences for the structs and the union.

Posted by John Graham-Cumming at 13:03 Email ThisBlogThis!Share to TwitterShare to FacebookShare to Pinterest Labels: pseudo-randomness 1 comment: Bart said...