C++ Debug assertion failed, using Windows.h mutex - c++

Question

I have a problem caused by this code:
char KernelFS::mount(Partition* part) {
WaitForSingleObject(mutexFS,INFINITE);
int pos;
for(pos=0; pos<26; pos++)
if(mountedPartitions[pos] == 0)
break;
if(pos < 26) {
mountedPartitions[pos] = part;
bitVectors[pos] = new BitVector(part);
fileEvidention[pos] = new ListHandler();
openedFiles[pos] = 0;
forbidOpening[pos] = false;
ReleaseMutex(mutexFS);
return intToChar(pos);
}
else {
ReleaseMutex(mutexFS);
return '0';
}
}
and
char KernelFS::format(char part){
WaitForSingleObject(mutexFS,INFINITE);
forbidOpening[charToInt(part)] = true;
ReleaseMutex(mutexFS);
while(openedFiles[charToInt(part)]>0)
WaitForSingleObject(unmountSem,INFINITE);
WaitForSingleObject(mutexFS,INFINITE);
// write fresh bit vector to cluster 0 of partition
bitVectors[charToInt(part)]->formatBitVector();
openedFiles[charToInt(part)] = 0;
forbidOpening[charToInt(part)] = false;
delete fileEvidention; //!!***!!
fileEvidention[charToInt(part)] = new ListHandler();
// some other stuff, irrelevant
ReleaseMutex(mutexFS);
return 1;
}
There are 3 thread executing, 1 is blocked and two are running through this code;
they first call mount, then format (each has its own argument Partition object, p1 and p2).
The first time mount is called, it always goes through - then there is an assertion failure at random during one of the next calls of mount/format by any of the two running threads.
Usually, it fails during thread 1 - it calls mount(..) completes it, then calls format(...) and fails around:
delete fileEvidention[charToInt(pos)];
(in debug mode, when I reach this instruction, even if I try to go into with F11, there is an assertion failure)
In case it matters... this is the initialization:
char KernelFS::firstLetter = 'A'; // 'A' = 65
Partition* KernelFS::mountedPartitions[26] = {0}; // init. no partitions are mounted
BitVector* KernelFS::bitVectors[26] = {0}; // init. no partitions are mounted
bool KernelFS::forbidOpening[26] = {false};
long KernelFS::openedFiles[26] = {0};
ListHandler* KernelFS::fileEvidention[26] = {0};
HANDLE KernelFS::mutexFS = CreateMutex(0,0,0);
HANDLE KernelFS::unmountSem = CreateSemaphore(0,0,INFINITE,0);
I have never had this error before, I have no idea how to debug this nor what could cause it.
Thanks for the help, in advance.
EDIT:
when i remove the marked line of code (and ignore the memory leak) there is no assertion failure. What is this witchcraft ?
! :)

Answer 1

Solved. should be
delete fileEvidention[charToInt(part)];
......