https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102769
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Clang I have (12) reports that as well:
clang-12 pr102769.c -g -fsanitize=address,undefined && ./a.out
/usr/bin/ld: warning: Cannot export local symbol '__asan_extra_spill_area'
=================================================================
==30045==ERROR: AddressSanitizer: stack-use-after-scope on address
0x7fffffffdcd0 at pc 0x0000004cbe5e bp 0x7fffffffdc30 sp 0x7fffffffdc28
READ of size 4 at 0x7fffffffdcd0 thread T0
#0 0x4cbe5d in main /home/marxin/Programming/testcases/pr102769.c:5:19
#1 0x7ffff7cbd53f in __libc_start_call_main
/usr/src/debug/glibc-2.34-2.1.x86_64/csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#2 0x7ffff7cbd5eb in __libc_start_main@GLIBC_2.2.5
/usr/src/debug/glibc-2.34-2.1.x86_64/csu/../csu/libc-start.c:409:3
#3 0x41f814 in _start
/home/abuild/rpmbuild/BUILD/glibc-2.34/csu/../sysdeps/x86_64/start.S:116
Address 0x7fffffffdcd0 is located in stack of thread T0 at offset 144 in frame
#0 0x4cbccf in main /home/marxin/Programming/testcases/pr102769.c:2
This frame has 2 object(s):
[32, 112) 'g' (line 3)
[144, 148) 'h' (line 7) <== Memory access at offset 144 is inside this
variable
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/pr102769.c:5:19 in main
Shadow bytes around the buggy address:
0x10007fff7b40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10007fff7b50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10007fff7b60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10007fff7b70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10007fff7b80: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00
=>0x10007fff7b90: 00 00 00 00 00 00 f2 f2 f2 f2[f8]f3 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: 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
==30045==ABORTING
