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segmentation fault due to initialize() function when changing the size of the huge page allocation


segmentation fault due to initialize() function when changing the size of the huge page allocation

By : user2953518
Date : November 21 2020, 01:01 AM
help you fix your problem When accessing set*LINE_SIZE+(ASSOC-1)*WAY_SIZE = set*64 + CACHE_SIZE - WAY_SIZE = set*64 + 4*1024*1024 - WAY_SIZE which is bigger than mmap length LENGTH = 4*1024 in the loop of initialize , you are accessing memory out of bound. That's the reason why you got segment fault when define LENGTH = 4*1024.
code :


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C++ segmentation fault on allocation

C++ segmentation fault on allocation


By : nealyi
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Ah, now I see the problem: You allocate a pointer in InitalizeUserActivity, pass it to readSQL which allocates again (causing a memory leak).
The bigger problem is that, as all arguments, the pointer is passed by value, i.e. the readSQL function is only operating on a copy of the pointer from InitalizeUserActivity. When the pointer is changed inside the readSQL function, only the copy is changed. This of course leads you to read data into memory that can't be accessed from outside the readSQL function.
Segmentation fault on large size array with heap allocation

Segmentation fault on large size array with heap allocation


By : Wira Done
Date : March 29 2020, 07:55 AM
this one helps. The problem is in countSort. The output and output1 arrays are local arrays, not dynamically allocated, and they're too big for local variables. You're also using the C feature of variable-length arrays, which aren't part of standard C++. Change them to:
code :
int *output = new int[n];
int *output1 = new int[n];
delete[] output;
delete[] output1;
Segmentation fault due to size() function of self-implemented data structure in C++

Segmentation fault due to size() function of self-implemented data structure in C++


By : Arun Thomas
Date : November 19 2020, 11:01 PM
seems to work fine This code is not enough to tell you what is happening, we can only make a guess.
I would say that your leak comes from the method data: you create a copy of the data and then return a pointer to this copy. It would be better to return an unique_ptr, so the memory is released automatically.
code :
int length = size(key);

if( length == -1 )
    return nullptr;

for( int i=0; i<pairs.size(); i++)
{
    if( pairs[i][0] == key )
    {
      return &pairs[i][1];
    }
}
return nullptr;
Stack allocation of character array causes Segmentation Fault while Heap allocation does not

Stack allocation of character array causes Segmentation Fault while Heap allocation does not


By : SirCAS
Date : March 29 2020, 07:55 AM
around this issue Are you running on a small platform where the available stack space is less than (2*999+1)*9999 = 19,988,001 bytes? Or maybe your compiler defaults to a stack smaller than that? For example, this thread says that Visual Studio's default stack size is only 1MB: C/C++ maximum stack size of program.
Exporting allocation function to subroutine resulting in segmentation fault.

Exporting allocation function to subroutine resulting in segmentation fault.


By : lorens13
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I have a device that requires a structure pointer be passed to an allocation function like such: ,
Am I doing something wrong,
code :
init_device(&params);
void init_device(snd_pcm_hw_params_t** params);

int main(){
  snd_pcm_hw_params_t* params; 
  init_device(&params); 
}
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