https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124548
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |pinskia at gcc dot
gnu.org
Status|NEW |ASSIGNED
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Yes even clang says this is undefined.
ASM generation compiler returned: 0
Execution build compiler returned: 0
Program returned: 1
=================================================================
==1==ERROR: AddressSanitizer: stack-use-after-scope on address 0x7bc9be3f0060
at pc 0x5b1595e4cf6c bp 0x7ffc088c70d0 sp 0x7ffc088c70c8
READ of size 4 at 0x7bc9be3f0060 thread T0
#0 0x5b1595e4cf6b in my_coro(int, int&, int&&) (.resume)
/app/example.cpp:178:22
#1 0x5b1595e4e6d3 in
std::__1::coroutine_handle<coro1::promise_type>::resume[abi:nqe230000]() const
/cefs/a0/a0eac97a78a7814c1d665790_clang-trunk-20260317/bin/../include/c++/v1/__coroutine/coroutine_handle.h:144:5
#2 0x5b1595e4ca2d in main /app/example.cpp:193:12
#3 0x7fc9c0429d8f (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f) (BuildId:
095c7ba148aeca81668091f718047078d57efddb)
#4 0x7fc9c0429e3f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x29e3f) (BuildId:
095c7ba148aeca81668091f718047078d57efddb)
#5 0x5b1595d65394 in _start (/app/output.s+0x2d394)
Address 0x7bc9be3f0060 is located in stack of thread T0 at offset 96 in frame
#0 0x5b1595e4c88f in main /app/example.cpp:183
This frame has 4 object(s):
[32, 36) 'lvr' (line 186)
[48, 52) 'ref.tmp' (line 187)
[64, 72) 'x' (line 188)
[96, 100) 'ref.tmp' (line 188) <== Memory access at offset 96 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 /app/example.cpp:178:22 in
my_coro(int, int&, int&&) (.resume)
Shadow bytes around the buggy address:
0x7bc9be3efd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x7bc9be3efe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x7bc9be3efe80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x7bc9be3eff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x7bc9be3eff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x7bc9be3f0000: f1 f1 f1 f1 04 f2 04 f2 00 f2 f2 f2[f8]f3 f3 f3
0x7bc9be3f0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x7bc9be3f0100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x7bc9be3f0180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x7bc9be3f0200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x7bc9be3f0280: 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
