double-free

Confusing double free error message/memory leak in iPhone app

由 只愿长相守 提交于 2019-12-24 11:02:00
问题 EDIT - added .h file I'm having difficulty trying to find the cause of a double free error. Steps taken to solve 1) Used the Zombies tool. Zombies reports that tid is being double freed 2) Set a breakpoint on malloc_error_break. This identifitied the following code segment as faulty: - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; [connection release]; [ldestination release]; [ldeparts_from release]; [ltime release]; [lcs_id release]; /// It breaks here

double free*** set a breakpoint in malloc_error_break to debug in ARC

由 南笙酒味 提交于 2019-12-17 21:05:34
问题 I am using ARC in my application with core data and threading etc, after doing all that hard work to get core data work with threading without any crashes now I am getting a new crash with the reason- double free*** set a breakpoint in malloc_error_break to debug How am I supposed to handle this? I have no control on the objects' retain counts. 回答1: Enable Zombie Follow this link : http://iphone2020.wordpress.com/2012/02/23/capturing-exceptions-while-debugging/. This will suggest exact point

What does “double free” mean?

由 邮差的信 提交于 2019-12-17 19:17:42
问题 As the title suggests I am new to C and have a mid-term coming up shortly. I am revising from past papers currently and a recurring theme is double free problem. I understand that it is the process of calling free() on the same memory location twice, but I have a couple of questions that I'm not 100% sure how to answer: Question 1: What is the result of a double free in C, and why is it such a problem? This will cause a double free: char* ptr = malloc(sizeof(char)); *ptr = 'a'; free(ptr);

double free or corruption (fasttop)

由 邮差的信 提交于 2019-12-03 16:14:19
问题 The following section of my code gives me this messege when executing * glibc detected ./a.out: double free or corruption (fasttop): 0x08e065d0 ** i have gone through the code many times but i cant clealry see how i am misusing the free (temp2) bool found= false; int x=0; for ( x=0; x<=312500; x++) { while (count <=32) { fscanf (file, "%d", &temp->num); temp->ptr=NULL; newNode = (NODE *)malloc(sizeof(NODE)); newNode->num=temp->num; newNode->ptr=NULL; if (first != NULL) { temp2=(NODE *)malloc

Static library loaded twice

由 一个人想着一个人 提交于 2019-11-28 21:59:59
I have shared object A.so which statically links to libssl.a & another shared object B.so which also statically links libssl.a . A.so & B.so has symbols from libssl.a in GLOBAL scope. I checked this by readelf -s A.so I have an executable a.out which loads A.so and B.so. When a.out terminated I get a double free error in one of the symbols from libssl.a in A.so. Even though libssl.a is statically linked to each shared object, since they are exposed globally is it possible that the same symbol is shared instead of picking it's local copy. What is the workaround this ? How to make the symbols

What does “double free” mean?

由 那年仲夏 提交于 2019-11-28 09:42:40
As the title suggests I am new to C and have a mid-term coming up shortly. I am revising from past papers currently and a recurring theme is double free problem. I understand that it is the process of calling free() on the same memory location twice, but I have a couple of questions that I'm not 100% sure how to answer: Question 1: What is the result of a double free in C, and why is it such a problem? This will cause a double free: char* ptr = malloc(sizeof(char)); *ptr = 'a'; free(ptr); free(ptr); My response to this would be, would it return a 0x0 memory address and cause a system

Static library loaded twice

由 ε祈祈猫儿з 提交于 2019-11-27 14:10:20
问题 I have shared object A.so which statically links to libssl.a & another shared object B.so which also statically links libssl.a . A.so & B.so has symbols from libssl.a in GLOBAL scope. I checked this by readelf -s A.so I have an executable a.out which loads A.so and B.so. When a.out terminated I get a double free error in one of the symbols from libssl.a in A.so. Even though libssl.a is statically linked to each shared object, since they are exposed globally is it possible that the same symbol
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