LSan doesn't detect leaks with mmap

[ghost]

Hello, thank you for this project
While I'm using LSan I found that it doesn't detect leaks with mmap

Is there any reason why ?
It must be great if someone let me know !

test code is simple like below

#include <sys/mman.h>

int main() {
    int* ptr2 = (int*)mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
}

[kcc]

lsan is a heap (malloc) leak detector.

It's hard to even define what is an mmap leak, because mmap-ed data doesn't really ever leak - you can still find all the mappings in /proc/maps and unmap what you don't need, even if all pointers to that mapping are lost.

It should be possible to extend lsan to do the following:

• scan all memory to find all pointers to all currently mmap-ed regions (lsan does the full scan anyway).
• report mappings that no pointers are pointing to

I don't know how useful such tool is going to be.
(And we are not planing this work)

[ghost]

Thank you for the comment
I learned much^^