Assertion failed after poll

[cacharle]

I get the following assertion when receiving on a pull socket:

Assertion failed: pfd.revents & POLLIN (C:\Users\...\vcpkg\buildtrees\zeromq\src\v4.3.5-37c87b6b8c.clean\src\signaler.cpp:238)

Here is the code that raises the assertion:

void Foo::run(std::stop_token stopToken)
{
    _injester = zmq::socket_t(_context, zmq::socket_type::pull);
    _publisher = zmq::socket_t(_context, zmq::socket_type::pub);
    _publisher.bind("inproc://foo");
    _injester.bind("inproc://bar");
    _injester.set(zmq::sockopt::rcvtimeo, 1000);

    while (!stopToken.stop_requested()) {
        zmq::message_t message;
        auto recvResult = _injester.recv(message); // Assert failed here
        if (!recvResult.has_value()) // Timeout
            continue;
        // do stuff
    }
}

I see the assertion is raised in that file:

libzmq/src/signaler.cpp

Line 238 in 3e5ce5c

zmq_assert (pfd.revents & POLLIN);

I'm not too familiar with poll so I'm not sure how it's possible to get something else in that place.

I am on Windows This happens on Windows and Linux, running the v4.3.5 version of libzmq.