GCD tests are broken on Mac OS 10.6

[ramosian-glider]

Originally reported on Google Code with ID 35

asanbot has started reporting failures in GCD tests on Mac OS 10.6 today:
[  FAILED  ] AddressSanitizerMac.GCDDispatchAsync
[  FAILED  ] AddressSanitizerMac.GCDDispatchSync
[  FAILED  ] AddressSanitizerMac.GCDReuseWqthreadsAsync
[  FAILED  ] AddressSanitizerMac.GCDReuseWqthreadsSync
[  FAILED  ] AddressSanitizerMac.GCDDispatchAfter
[  FAILED  ] AddressSanitizerMac.GCDSourceEvent
[  FAILED  ] AddressSanitizerMac.GCDSourceCancel
[  FAILED  ] AddressSanitizerMac.GCDGroupAsync

This may be caused by issue 33 or by something else.

Reported by ramosian.glider on 2012-01-30 14:46:19

[ramosian-glider]

I can see that a very simple ObjC test does not work with O2 (on Linux).

% cat foo.mm 
#include <stdlib.h>
int main(int argc, char **argv) {
  int *a = (int*)malloc(10 * sizeof(int));
  int res = a[argc + 10];
  free(a);
  return res;
}
% clang -O1 -ObjC  foo.mm -faddress-sanitizer  && ./a.out 2>&1 | grep ERROR
==11562== ERROR: AddressSanitizer heap-buffer-overflow on address 0x7f91d5144fac at
pc 0x401e90 bp 0x7fffccf6c0b0 sp 0x7fffccf6c0a8
% clang -O2 -ObjC  foo.mm -faddress-sanitizer  && ./a.out 2>&1 | grep ERROR
% 

Reported by konstantin.s.serebryany on 2012-01-30 23:06:14

[ramosian-glider]

And most of the asan GCD tests pass if built with -O1. 
I guess the optimizer is being too smart. 

Reported by konstantin.s.serebryany on 2012-01-30 23:12:55

[ramosian-glider]

r149296 fixes the problem by not letting the optimizer to optimize away the test code.

Reported by konstantin.s.serebryany on 2012-01-30 23:29:40

• Status changed: Fixed

[ramosian-glider]

Adding Project:AddressSanitizer as part of GitHub migration.

Reported by ramosian.glider on 2015-07-30 09:12:58

• Labels added: ProjectAddressSanitizer