https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62017
Maxim Ostapenko <chefmax at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |chefmax at gcc dot gnu.org --- Comment #2 from Maxim Ostapenko <chefmax at gcc dot gnu.org> --- Here another reprocase (diamond inheritance): ====================== struct A { int x; virtual ~A() {} }; struct B: public virtual A { }; struct C: public virtual A { }; struct D: public B, virtual public C { }; int main() { D d; } ==24761==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7ffff1d86bf8 at pc 0x400e1b bp 0x7ffff1d86b70 sp 0x7ffff1d86b68 WRITE of size 24 at 0x7ffff1d86bf8 thread T0 #0 0x400e1a in C::~C() (/home/max/build/gcc-upstream-x86_64/a.out+0x400e1a) #1 0x401257 in D::~D() (/home/max/build/gcc-upstream-x86_64/a.out+0x401257) #2 0x400a8b in main (/home/max/build/gcc-upstream-x86_64/a.out+0x400a8b) #3 0x7f7487a1676c in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2176c) #4 0x400918 (/home/max/build/gcc-upstream-x86_64/a.out+0x400918) Address 0x7ffff1d86bf8 is located in stack of thread T0 at offset 56 in frame #0 0x400a17 in main (/home/max/build/gcc-upstream-x86_64/a.out+0x400a17) This frame has 1 object(s): [32, 64) 'd' <== Memory access at offset 56 partially overflows this variable HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext (longjmp and C++ exceptions *are* supported) SUMMARY: AddressSanitizer: stack-buffer-overflow ??:0 C::~C() Shadow bytes around the buggy address: 0x10007e3a8d20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007e3a8d30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007e3a8d40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007e3a8d50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007e3a8d60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x10007e3a8d70: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00[00] 0x10007e3a8d80: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 0x10007e3a8d90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007e3a8da0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007e3a8db0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007e3a8dc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Heap right redzone: fb Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack partial redzone: f4 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc ASan internal: fe ==24761==ABORTING Compiled with recent GCC version: GNU C++ (GCC) version 5.0.0 20140916 (experimental) (x86_64-unknown-linux-gnu)