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Valgrind Invalid Read of Size 8 for insertion sort


By : Djratinho Reliquia
Date : October 18 2020, 06:10 PM
Any of those help Note that i and j are unsigned types. Hence your j loop is full of problems:
When i is 0:
code :


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valgrind | Invalid read of size 8 | Address 0x7a41270 is 0 bytes inside a block of size 4 alloc'd


By : Jordan Crow
Date : March 29 2020, 07:55 AM
may help you . since several days I am trying to find a memory bug in my software. , On line 201 in utf_8_decoder.c, you have
code :
fwprintf(stdout, L"TEST decoder *ds: %i\n", *((int*) ds));
fwprintf(stdout, L"TEST decoder *ds pre mbsnrtowcs as size_t: %i\n", *((size_t*) ds));

int n = mbsnrtowcs((wchar_t*) dd, (const char**) &sd, *((size_t*) sc), *((size_t*) ds), (mbstate_t*) *NULL_POINTER_STATE_CYBOI_MODEL);

Valgrind: invalid read of size 4 -> sigsegv, works fine without valgrind and in visual studio


By : Denis
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I have implemented a compression algorithm (using huffman coding) which uses a priority queue of nodes (a struct i defined). Now, when i just run the code in linux or in visual studio, everything works fine. When I check for memory leaks in visual studio, none are given. , I'll explain the first error to you.
code :
==1893== Invalid read of size 4
==1893==    at 0x80498E0: delete_min (huffman.c:331)
==1893==    by 0x80492DA: huffman_encode (huffman.c:196)
==1893==    by 0x8049DDE: encode_file (main.c:94)
==1893==    by 0x8049BBE: main (main.c:32)
==1893==  Address 0x441d9a8 is 0 bytes inside a block of size 452 free'd
==1893==    at 0x402BC70: realloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==1893==    by 0x8049922: delete_min (huffman.c:335)
==1893==    by 0x80492CC: huffman_encode (huffman.c:195)
==1893==    by 0x8049DDE: encode_file (main.c:94)
==1893==    by 0x8049BBE: main (main.c:32)
==1893==

valgrind gives invalid read of size 1


By : efren petarte
Date : March 29 2020, 07:55 AM
I wish this help you I have gone through several similarly asked questions regarding the same error code, most concern with passing invalid pointer addresses in return. However, this looks not to be the case here as my program correctly works with whatever address is passed in return. , In
code :
for (i = 0; string[i] != '\0'; i++) {
    if (string[i-1]) {
for(i = 1; ...
if (string[0] == 0) return string;
while (string[--i]==' '); string[++i]='\0';
while(i-- > 0 && string[i] == ' ');
string[++i] = 0;

Invalid read of size 8, Invalid write of size 8 (Valgrind)


By : Tiago Justino
Date : March 29 2020, 07:55 AM
it fixes the issue I've been playing around with the following code for several hours this evening and I am just scratching my head with it.
code :
std::cin >> rawScores[k];
studentInfo[j].score += rawScores[k]/scores[k] * weights[k];
$ valgrind --tool=memcheck --db-attach=yes ./a.out

C++ Invalid read size 4 valgrind


By : Kartheesan .R
Date : March 29 2020, 07:55 AM
wish help you to fix your issue It looks to me as if s is a null pointer because Dlist::findElement is returning a null pointer.
The big clue is the address valgrind is complaining about. Do you see it says "Address 0x10 is not stack'd, malloc'd or recently free'd"? It's extremely unusual (read: pretty much completely unheard-of) for genuine addresses to be so close to zero; what this almost always means is that your code encountered a null pointer, which happens to be represented by an address of zero on most systems, and then did some arithmetic on it (e.g., if a Stock is at address 0 then where is its amountOfShares? At address 16 = 0x10, perhaps).
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