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From: "blubban at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/105804] New: List-initialized argument in await expression
 is doubly freed
Date: Wed, 01 Jun 2022 15:14:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105804

            Bug ID: 105804
           Summary: List-initialized argument in await expression is
                    doubly freed
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: blubban at gmail dot com
  Target Milestone: ---

#include <coroutine>
#include <memory>

struct my_params {
        std::unique_ptr<int> ptr; // or any other object with nontrivial dt=
or
};

static std::suspend_never take_params(my_params params)
{
        return {};
}

struct coro_t {
        struct promise_type {
                coro_t get_return_object() { return {}; }
                std::suspend_never initial_suspend() { return {}; }
                std::suspend_never final_suspend() noexcept { return {}; }
                void unhandled_exception() noexcept {}
        };
};

static coro_t my_coro()
{
        co_await take_params({ std::make_unique<int>(5) });
}

int main()
{
        my_coro();
}


Expected output: Same as /bin/true
Actual: free(): double free detected in tcache 2

https://godbolt.org/z/8f9d3TzYo

Probably same root cause as bug 98056 and/or bug 103871, but since the symp=
toms
are way different (it's a wrong-code, not just rejects-valid), I think it
warrants a separate report.=