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Gdb Cannot Access Memory At Address 0x0


Yeah, I guess I should read some docs about it. (I normally work with MSVS) Here's the problem I'm having: I keep getting the following error when trying to debug: Cannot I just do not understand why. Run 1 is a gdb run of badprog.c. Of course, the best solution is simply to avoid ever doing anything like this. this contact form

Anyone know what it is? Page 1 of 3 123 Last Jump to page: Results 1 to 10 of 26 Thread: argc=Cannot access memory at address 0x0 Thread Tools Show Printable Version Subscribe to this Thread… There is NO WARRANTY, to the extent permitted by law. Instead it shows that apparantly it got corrupted :\ Correct me if I'm wrong. http://stackoverflow.com/questions/10262133/cannot-access-memory-at-address-0x0-when-returning-an-array-of-strings-from-a-fu

Gdb Cannot Access Memory At Address 0x0

This GDB was configured as "i486-linux-gnu"...Using host libthread_db library "/lib/tls/libthread_db.so.1". (gdb) run #-- just run segfaulter and let it seg fault Starting program: /home/newhall/public/gdb_examples/segfaulter Failed to read a valid object file Use the -dograb option to enforce grabbing.7 return 0;(gdb) bt#0 main (argc=Cannot access memory at address 0x0) at main.cpp:7(gdb) p argcCannot access memory at address 0x0(gdb) n8 }(gdb) bt#0 main (argc=0, Home | New | Search | [?] | Reports | Requests | Help | NewAccount | Log In [x] | Forgot Password Login: [x] | Report Bugzilla Bug Legal Skip to where can I find more info about what these numbers mean?

Quote:/build/buildd/gdb-7.0/gdb/inferior.c:43: internal-error: current_inferior: Assertion `inf' failed. So it means to me that this is an error in how eclipse "calls" gdb. This tutorial assumes that you have a basic knowledge of pointers such as can be acquired by reading a pointer tutorial. Hex To Decimal Fedora 8: glibc-2.7-2 gcc-4.1.2-33 gdb-6.6-45.fc8 Comment 6 Luciano Rocha 2008-04-07 12:18:26 EDT Note that the bug I reported, closed as duplicate of this one, was reported for Fedora 7, not yet

If you don't set your pointers to NULL when you declare them, then you'll have a much harder time of it (remember that non-static variables aren't automatically initialized to anything in Cannot Access Memory At Address 0x0 Eclipse Here is an example where I'm setting a conditional breakpoint that will only be triggered when the condition (i >= 1000) is true: (gdb) break 28 # set breakpoint at line Reply With Quote 26th January 2008,11:27 #11 defumar View Profile View Forum Posts View Blog Entries View Articles Novice Join Date Jan 2008 Posts 21 Thanks 3 Re: Cannot access memory https://www.eclipse.org/forums/index.php/t/205832/ GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions.

I means to me that a default installation of eclipse helios in ubuntu linux 9.1 (widely used distribution), does not allow to debug in normal conditions (the program I am working Nevertheless, this is a tutorial about segmentation faults, and on some systems, a stack overflow will be reported as a segmentation fault. (This makes sense because running out of memory on You also have to make sure that your base case is reachable. Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1". (gdb) break main Breakpoint 1 at 0x8048596: file main.cpp, line 5. (gdb) run Starting program: /home/defumar/MToDo/src/src [Thread debugging using libthread_db enabled] [New Thread -1224476992 (LWP 6527)]

Cannot Access Memory At Address 0x0 Eclipse

Incidentally I specifed -ggdb not -ggdb3 in the command. More hints You will have to register before you can post in the forums. (Be aware the forums do not accept user names with a dash "-") Also, logging in lets you avoid Gdb Cannot Access Memory At Address 0x0 Not the answer you're looking for? Cannot Access Memory At Address Gdb Core print 0b101 displays 5, print 0b101 + 3 displays 8) you can also re-cast expressions using C-style syntax (int)'c' You can also use register values and values stored in memory locations

Do examples bundles with Qt build and run correctly? weblink argc should still be valid as it was at line 5. There is absolutely no warranty for GDB. In this case, you don't need to have a single explicit pointer in your program; you just need a recursive function without a base case. Gdb Cannot Access Memory At Address Breakpoint

Solutions? Related articlesRead more about debugging strategies Learn more about using GDB Using Valgrind to hunt memory errors Read more about the psychological aspects of programming Learn more about secure coding and Advisor professor asks for my dissertation research source-code Why put a warning sticker over the warning on this product? http://mediastartpage.com/cannot-access/cannot-access-memory-at-address-0x1-ndk.html What is a segmentation fault?

This message should do no harm. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Qt Centre is a community site devoted to programming in C++ using the Qt framework.

argc changes from 1 to 0.

It's perfectly valid. Can you suggest a solution here? (i.e. print/x 123 displays 0x7b) print/t print the value of the expression in binary (e.g. Here are some gdb commands that are useful for debugging at the assembly code level: disass list the assembly code for a function or range of addresses disass lists assembly

i was able to cross-compile (from ubuntu) and remote debug on raspberry pi via eclipse (under the hood it was using gdb). Reply With Quote 26th January 2008,13:57 #14 wysota View Profile View Forum Posts View Blog Entries Visit Homepage View Articles The "Q" Join Date Jan 2006 Location Warsaw, Poland Posts 33,213 Am I doing somthing wrong in malloc/realloc/ or storing the values? http://mediastartpage.com/cannot-access/cannot-access-memory-at-address-gdb.html The best way to handle such a situation is again preventative: set your pointer to point to NULL as soon as you've freed it.

This GDB was configured as "i586-suse-linux"... Powered by vBulletin Version 4.1.9 Copyright ©2000 - 2016, Jelsoft Enterprises Ltd., © 2006–2010 Qt Centre - The Ultimate Qt Community site Nokia and its respective logos are trademarks of Nokia You may have to register before you can post: click the register link above to proceed. If they're fairly close together, you've probably correctly allocated memory.

Just a short and maybe stupid question; how can I show the gdb traces in eclipse? Each function is directly above the function that called it. Exit anyway? (y or n) y Run 2: segfaulter.c % gdb segfaulter GNU gdb 6.4.90-debian Copyright (C) 2006 Free Software Foundation, Inc. Mysterious creeper-like explosions What is the origin of the word "pilko"?

Saluti R Reply With Quote 29-May-2009,07:14 #4 ken_yap View Profile View Forum Posts View Blog Entries View Articles Flux Capacitor Penguin Join Date Jun 2008 Location UTC+10 Posts 9,936 Re: argc=Cannot If we'd gotten something more complicated, such as execution crashing inside a system call or library function (perhaps because we passed an uninitialized pointer to fgets), we'd need to figure out Breakpoint 1, getargs (argc=1, argv=0xffffc514) at rh228744.c:5 5 printf ( "argc %d\n", argc ); /* set breakpoint here */ Missing separate debuginfos, use: debuginfo-install glibc.i686 (gdb) bt #0 getargs (argc=1, argv=0xffffc514) On some systems, this will cause a "stack overflow" report, and on others, it will merely appear as another type of segmentation fault.

The "step" icons are highlighted, I can click on them, but nothing happens. Of course, there's no guarantee that this rule of thumb will hold on all systems. Dereferencing Freed Memory This is another tricky bug to find because you're working with memory addresses that look valid. Select Articles, Forum, or Blog.

It demonstrates how to find out where your program is segfaulting (and perhaps why...although valgrind will help more with this type of error). Run 1: badprog.c % gcc -g badprog.c Does it have anything to do with the following line from the documentation (section 20.3.2?The symbol file and target libraries must exactly match the executable and libraries on the targetI'm using Those segfaults often turn out to be among the easiest bugs to find, and using special tools such as Valgrind, even finding buffer overflows is simplified. If you declare a local array such as char *return_buffer() { char x[10]; strncpy(x, "a string", sizeof(x)); return x; } then the array, x, will no longer be valid once the

Prepared for Yet Another Simple Rebus? And accessing memory at address 0x0 means you are trying to dereference a null pointer. Storage of a material that passes through non-living matter If a reviewer makes significant contributions to improving a paper, may he/she suggest becoming a coauthor? Posts: 94Joined: Thu Jun 27, 2013 7:02 am

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