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When adding text to mouse location on click giving segmentation fault


When adding text to mouse location on click giving segmentation fault

By : cribi
Date : October 16 2020, 06:10 PM
around this issue The actual problem is located in the mouse_Callback(...) function, more specifically here:
code :
cv::Vec3b vec = img.at<cv::Vec3b>(x, y);
cv::Vec3b vec = img.at<cv::Vec3b>(y, x);


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Why is this giving me a segmentation fault?

Why is this giving me a segmentation fault?


By : Joen Don
Date : March 29 2020, 07:55 AM
With these it helps I'm creating a simply program to lookup a word in a dictionary.
code :
for(i = 0; 1 < entries; i++)
Giving Segmentation fault and idk where

Giving Segmentation fault and idk where


By : Mr. Knister
Date : March 29 2020, 07:55 AM
To fix the issue you can do In general, compile for debug with gcc -g and then run the binary under gdb. When it coredumps, give gdb the where command to see the full call stack, showing the line number in your program where it failed.
Here, for example, is my gdb session figuring out the cause. I run the program in gdb with gdb ./a.out then enter a test value. When it crashes, it shows the error is in an (assembly) implementation of strcmp (I don't have that library source file, hence the "No such file or directory". I go up 1 to move the view up one level in the stack (into your within function) and there I print the values of the two arguments to strcmp. One of them is patently not what it should be.
code :
Reading symbols from ./a.out...done.
(gdb) run
Starting program: /tmp/p/a.out 
Enter a value: 10

Program received signal SIGSEGV, Segmentation fault.
__strcmp_sse2_unaligned () at ../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:31
31  ../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S: No such file or directory.
(gdb) up 1
#1  0x00005555555547f4 in within (str=0x0, biblio=0x7fffffffe450, size=24) at foo.c:11
11          if(strcmp(str, aux) == 0 )
(gdb) print (str)
$1 = 0x0
(gdb) print (aux)
$2 = 0x555555554a44 "mostarda"
Why fscanf is giving segmentation fault while reading the data into a text file?

Why fscanf is giving segmentation fault while reading the data into a text file?


By : user3223776
Date : March 29 2020, 07:55 AM
To fix the issue you can do Remove goto.
Refactor this part of your code please.
code :
while(c = fscanf(q,"%d %s %s %d %s %s %llu%[^\n]",&add.acc_no,add.password,add.name,&add.age,add.gender,add.address,&add.phone) == 7)
while((c = fscanf(q,"%d %s %s %d %s %s %llu%[^\n]",&add.acc_no,add.password,add.name,&add.age,add.gender,add.address,&add.phone)) == 7)
createBinaryTree is giving an infinite Loop and createBinarySearchTree is giving segmentation Fault

createBinaryTree is giving an infinite Loop and createBinarySearchTree is giving segmentation Fault


By : user3559459
Date : March 29 2020, 07:55 AM
hop of those help? For the BinarySearchTree. In the first iteration, you setting the new node to NULL in every iteration. It would be better to first check the value of the node and then decide, which direction to traverse the tree in. When you hit the root add the node. Something like the following.
Take input of root separately so that you can compare the next input.
code :
        case 1:
        printf("Enter Root Node\n");
        scanf(" %d", &tempvalue);
        NODE root;
        root = (NODE)malloc(sizeof(struct node));
        root->data = tempvalue;
        while (tempvalue != -1)
        {   
            printf("Enter Node Value\n");
            scanf(" %d", &value);
            if(value == -1){
                break;
            }
            root = createBinarySearchTree(root, value);
        }
        return 0;
NODE createBinarySearchTree(NODE root, int ele)
{
    NODE new_node;
    new_node = (NODE)malloc(sizeof(struct node));
    new_node->data = ele;

    if (root == NULL)
        return new_node;

    NODE curr = root;

    while (curr != NULL)
    {
        printf("%d\n",curr->data);
        if(ele < curr->data )
        {
            if(curr->lchild == NULL){
                printf("inserted %d as left child of %d\n",ele,curr->data );
                curr->lchild = new_node;
                return root;
            }
            curr=curr->lchild;
        }
        else if(ele > curr->data)
        {
            if(curr->rchild == NULL){
                printf("inserted %d as right child child of %d\n",ele,curr->data );
                curr->rchild = new_node;
                return root;
            }
             curr=curr->rchild;
        }
    }
    return root;
}
Segmentation Fault Example not giving Segmentation Fault

Segmentation Fault Example not giving Segmentation Fault


By : Alfonzo Vizcaya
Date : March 29 2020, 07:55 AM
Any of those help The sample code only segfaults, if malloc(1<<31) fails, returning NULL. However, malloc(1<<31) succeeds if your system is able to allocate 2 gigs of memory without failing. That segfault example code snippet is from a time when systems could not typically allocate that amount of memory. Whether that succeeds or not depends on the amount of physical memory, on the amount of memory used up by other processes, and on the kernel's memory overcommit strategy, plus possibly on the (libc and) kernel versions used. So the different behaviour you see can be the result of different settings for the overcommit sysctl's, of the different set of processes running, or, obviously, of a different amount of physical memory.
From /usr/src/linux/Documentation/vm/overcommit-accounting:
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