https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98419
Martin Liška <marxin at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |marxin at gcc dot gnu.org --- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> --- It seems you invoke a use-after-scope: g++ pr98419.C -fsanitize=address,undefined && ./a.out ================================================================= ==31013==ERROR: AddressSanitizer: stack-use-after-scope on address 0x7fffffffdf30 at pc 0x000000401532 bp 0x7fffffffdec0 sp 0x7fffffffdeb8 WRITE of size 4 at 0x7fffffffdf30 thread T0 #0 0x401531 in B::~B() (/home/marxin/Programming/testcases/a.out+0x401531) #1 0x401293 in foo() (/home/marxin/Programming/testcases/a.out+0x401293) #2 0x4012fb in main (/home/marxin/Programming/testcases/a.out+0x4012fb) #3 0x7ffff676e151 in __libc_start_main (/lib64/libc.so.6+0x28151) #4 0x4010fd in _start (/home/marxin/Programming/testcases/a.out+0x4010fd) Address 0x7fffffffdf30 is located in stack of thread T0 at offset 48 in frame #0 0x4011b5 in foo() (/home/marxin/Programming/testcases/a.out+0x4011b5) This frame has 2 object(s): [48, 52) '<unknown>' <== Memory access at offset 48 is inside this variable [64, 72) 'b' (line 17) HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork (longjmp and C++ exceptions *are* supported) SUMMARY: AddressSanitizer: stack-use-after-scope (/home/marxin/Programming/testcases/a.out+0x401531) in B::~B() Shadow bytes around the buggy address: 0x10007fff7b90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7ba0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7bb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7bc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7bd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x10007fff7be0: f1 f1 f1 f1 f1 f1[f8]f2 00 f3 f3 f3 00 00 00 00 0x10007fff7bf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7c10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7c20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7c30: 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 Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb Shadow gap: cc ==31013==ABORTING