Sometimes crashes in scheduler::run

[romanholidaypancakes]

Version of Beast

BOOST_BEAST_VERSION 347

Steps necessary to reproduce the problem

The code is similar to

int main(int argc, char* argv[])
{
    // The io_context is required for all I/O
    net::io_context ioc{threads};

    // Create and launch a listening port
    std::make_shared<listener>(
        ioc,
        tcp::endpoint{address, port},
        doc_root)->run();

    // Run the I/O service on the requested number of threads
    std::vector<std::thread> v;
    v.reserve(threads - 1);
    for(auto i = threads - 1; i > 0; --i)
        v.emplace_back(
        [&ioc]
        {
            ioc.run();
        });
    ioc.run();

    return EXIT_SUCCESS;
}

Sometimes it crashes here

#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at ./nptl/pthread_kill.c:44
#1  0x00007f1f5d3cad9f in __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
#2  0x00007f1f5d37bf32 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#3  0x00007f1f5d366472 in __GI_abort () at ./stdlib/abort.c:79
#4  0x00007f1f5d69d919 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
#5  0x00007f1f5d6a8e1a in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x00007f1f5d6a8e85 in std::terminate() () from /lib/x86_64-linux-gnu/libstdc++.so.6
#7  0x00007f1f5d6a8e0e in std::rethrow_exception(std::__exception_ptr::exception_ptr) () from /lib/x86_64-linux-gnu/libstdc++.so.6
#8  0x0000558b9fa36644 in boost::asio::detail::scheduler::run(boost::system::error_code&) [clone .isra.0] ()
#9  0x0000558b9fa366cf in std::thread::_State_impl<std::thread::_Invoker<std::tuple<BeastServer::run()::{lambda()#1}> > >::_M_run() ()
#10 0x00007f1f5d6d44a3 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
#11 0x00007f1f5d3c9044 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
#12 0x00007f1f5d44961c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

All relevant compiler information

gcc-12

[ashtum]

It seems that an exception is thrown by one of the completion handlers in your code and rethrown by io_context::run(): Effect of exceptions thrown from handlers.

It would be helpful to see the contents of the exception, you can catch it like this:

try
{
  io_context.run();
}
catch (const std::exception& e)
{
  std::cerr << "Exception: " << e.what() << "\n";
}