https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102573
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC warns:
<source>: In function 'int main()':
<source>:9:19: warning: assignment from temporary 'initializer_list' does not
extend the lifetime of the underlying array [-Winit-list-lifetime]
9 | il = {111, 222};
| ^
Plus at runtime with -fsanitize=address:
=================================================================
==1==ERROR: AddressSanitizer: stack-use-after-scope on address 0x7ffcff6b4e10
at pc 0x00000040147d bp 0x7ffcff6b4dc0 sp 0x7ffcff6b4db8
READ of size 4 at 0x7ffcff6b4e10 thread T0
#0 0x40147c in main /app/example.cpp:13
#1 0x7f5915fc70b2 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
#2 0x40118d in _start (/app/output.s+0x40118d)
Address 0x7ffcff6b4e10 is located in stack of thread T0 at offset 32 in frame
#0 0x401255 in main /app/example.cpp:7
This frame has 2 object(s):
[32, 40) '<unknown>' <== Memory access at offset 32 is inside this variable
[64, 80) 'il' (line 8)
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 /app/example.cpp:13 in main
Shadow bytes around the buggy address:
0x10001fece970: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10001fece980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10001fece990: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10001fece9a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10001fece9b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1
=>0x10001fece9c0: f1 f1[f8]f2 f2 f2 00 00 f3 f3 00 00 00 00 00 00
0x10001fece9d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10001fece9e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10001fece9f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10001fecea00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10001fecea10: 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
==1==ABORTING
initializer_list size: 2
initializer_list underlying elements:
clang also errors out the same way.
