Hello, This simple code demonstrates the problem: int main () { char* buffer1; char* buffer2; int size = 2*1024*1024 + 1; for(;;) { buffer1 = (char *) malloc(size); buffer2 = (char *) malloc(size); free(buffer1); free(buffer2); } } The second free() does not free allocated memory if size >2Mb. On 6.1-STABLE all is OK. Best Regards