Status: Accepted
Owner: [email protected]
Labels: Type-Defect Priority-Medium
New issue 360 by [email protected]: Using Obj-C blocks triggers a
false-positive ODR violation
https://code.google.com/p/address-sanitizer/issues/detail?id=360
On OS X top-of-tree Clang+AddressSanitizer, the following produces a false
positive ODR violation during initialization:
void f() {
int y = 7;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND,
0), ^{
dispatch_sync(dispatch_get_main_queue(), ^{
printf("num = %d\n", y);
});
});
}
=================================================================
==98053==ERROR: AddressSanitizer: odr-violation (0x00010cb4ae20):
[1] size=1 'OBJC_CLASS_NAME_2'
/tmp/llvm/projects/compiler-rt/test/asan/TestCases/Darwin/objc-odr.mm
[2] size=1 'OBJC_CLASS_NAME_'
/tmp/llvm/projects/compiler-rt/test/asan/TestCases/Darwin/objc-odr.mm
These globals were registered at these points:
[1]:
#0 0x10cb5989c
(/tmp/llvm-cmake-debug/lib/clang/3.6.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x889c)
#1 0x10cb4ac2b
(/tmp/llvm-cmake-debug/projects/compiler-rt/test/asan/64bitConfig/TestCases/Darwin/Output/objc-odr.mm.tmp+0x100001c2b)
#2 0x7fff67e5acea (<unknown module>)
#3 0x7fff67e5ae77 (<unknown module>)
...
Apparently, something changed in the way Obj-C globals are generated or
instrumented. See the attached test case.
Attachments:
objc-odr.mm 458 bytes
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