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From: "dboles.src at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/113460] New: Segfault in __builtin_coro_destroy when
 using std::generator to concate ranges
Date: Wed, 17 Jan 2024 20:57:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113460

            Bug ID: 113460
           Summary: Segfault in __builtin_coro_destroy when using
                    std::generator to concate ranges
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dboles.src at gmail dot com
  Target Milestone: ---

Created attachment 57120
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D57120&action=3Dedit
.ii, .o, .s files

Using

   g++ (Debian 20240101-1) 14.0.0 20240101 (experimental) [master
r14-6875-g3a7dd24eade]=20

Running this:

```cpp
#include <array>
#include <generator>
#include <ranges>
#include <vector>

using namespace std;

template <ranges::input_range... Ranges>
[[nodiscard]] auto
concat(Ranges&&... ranges) -> generator<int, int>
{
        (co_yield ranges::elements_of(ranges), ...);
}

auto
main() -> int
{
        auto const numbers1 =3D array{0};
        auto const numbers2 =3D vector{0};
        for (auto const _: concat(numbers1, numbers2) ) {}
}
```

gives this:

```none
Program received signal SIGSEGV, Segmentation fault.
0x0000000000403e8e in std::__n4861::coroutine_handle<std::generator<int con=
st&,
int, std::allocator<std::byte> >::promise_type>::destroy (this=3D0x41c320) =
at
/usr/lib/gcc-snapshot/include/c++/14/coroutine:244
244           void destroy() const { __builtin_coro_destroy(_M_fr_ptr); }
(ins)(gdb) bt
#0  0x0000000000403e8e in std::__n4861::coroutine_handle<std::generator<int
const&, int, std::allocator<std::byte> >::promise_type>::destroy
(this=3D0x41c320) at /usr/lib/gcc-snapshot/include/c++/14/coroutine:244
#1  0x000000000040367c in std::generator<int const&, int,
std::allocator<std::byte> >::~generator (this=3D0x41c320,=20
    __in_chrg=3D<optimized out>) at
/usr/lib/gcc-snapshot/include/c++/14/generator:700
#2  0x0000000000402cd0 in std::__gen::_Promise_erased<int
const&>::_Recursive_awaiter<std::generator<int const&, int,
std::allocator<std::byte> > >::~_Recursive_awaiter (this=3D0x41c320,
__in_chrg=3D<optimized out>) at
/usr/lib/gcc-snapshot/include/c++/14/generator:360
#3  0x0000000000401b8a in
concat(_Z6concatITpTkNSt6ranges11input_rangeEJRKSt5arrayIiLm1EERKSt6vectorI=
iSaIiEEEESt9generatorIiivEDpOT_.Frame
*) (frame_ptr=3D0x41c2d0) at concatWC.cpp:13
#4  0x000000000040186f in
operator()(_ZZNSt5__gen15_Promise_erasedIRKiE11yield_valueIRKSt6vectorIiSaI=
iEESaISt4byteEEEDaNSt6ranges11elements_ofIT_T0_EEENKUlSt15allocator_arg_tSB=
_N9__gnu_cxx17__normal_iteratorIPS1_S7_EESL_E_clESH_SB_SL_SL_.Frame
*) (frame_ptr=3D0x41c3e0)
    at /usr/lib/gcc-snapshot/include/c++/14/generator:160
#5  0x000000000040409b in
std::__n4861::coroutine_handle<std::__gen::_Promise_erased<int const&>
>::resume (this=3D0x41c2e0)
    at /usr/lib/gcc-snapshot/include/c++/14/coroutine:242
#6  0x0000000000403b62 in std::generator<int, int, void>::_Iterator::_M_next
(this=3D0x7fffffffdd58)
    at /usr/lib/gcc-snapshot/include/c++/14/generator:793
#7  0x00000000004032e6 in std::generator<int, int, void>::_Iterator::operat=
or++
(this=3D0x7fffffffdd58)
    at /usr/lib/gcc-snapshot/include/c++/14/generator:767
#8  0x00000000004012e4 in main () at concatWC.cpp:20
(ins)(gdb)=20
```

Outputs of -freport-bug -save-temps are attached. Let me know if I can help
with any more info.

Thanks for implementing std::generator and all the other work on GCC and C+=
+!=