https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83118
--- Comment #16 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Compiling the reduced test
type :: any_vector
class(*), allocatable :: v(:)
end type
type(any_vector) :: x, y
x%v = ['foo','bar']
end
with -fsanitize=address gives
==54286==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x602000000150 at pc 0x000102fb38df bp 0x7ffeecc4d180 sp 0x7ffeecc4d178
READ of size 8 at 0x602000000150 thread T0
#0 0x102fb38de in MAIN__ (a.out:x86_64+0x1000018de)
#1 0x102fb3b9a in main (a.out:x86_64+0x100001b9a)
#2 0x7fff7512bed8 in start (libdyld.dylib:x86_64+0x16ed8)
0x602000000156 is located 0 bytes to the right of 6-byte region
[0x602000000150,0x602000000156)
allocated by thread T0 here:
#0 0x1032e784f in wrap_malloc sanitizer_malloc_mac.inc:114
#1 0x102fb37b3 in MAIN__ (a.out:x86_64+0x1000017b3)
#2 0x102fb3b9a in main (a.out:x86_64+0x100001b9a)
#3 0x7fff7512bed8 in start (libdyld.dylib:x86_64+0x16ed8)
SUMMARY: AddressSanitizer: heap-buffer-overflow (a.out:x86_64+0x1000018de) in
MAIN__
Shadow bytes around the buggy address:
0x1c03ffffffd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1c03ffffffe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1c03fffffff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1c0400000000: fa fa fd fd fa fa fd fd fa fa 00 00 fa fa 00 07
0x1c0400000010: fa fa 03 fa fa fa 00 00 fa fa 00 06 fa fa 06 fa
=>0x1c0400000020: fa fa 07 fa fa fa 07 fa fa fa[06]fa fa fa fa fa
0x1c0400000030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x1c0400000040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x1c0400000050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x1c0400000060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x1c0400000070: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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
