NetMQ Version: 4.0.1.13 with [PR 1087](https://github.com/zeromq/netmq/pull/1087) debug mode
Operating System: Alpine Linux
.NET Version: standard 2.0
Expected behaviour
Mailbox.TryRead should not throw when returning a command for debug mode.
Actual behaviour
When run in debug mode Debug.Assert(ok); may throw since m_commandPipe.TryRead may return false:
Process terminated. Assertion failed.
at NetMQ.Core.Mailbox.TryRecv(Int32 timeout, Command& command)
at NetMQ.Core.SocketBase.ProcessCommands(Int32 timeout, Boolean throttle, CancellationToken cancellationToken)
at NetMQ.Core.SocketBase.GetSocketOptionX(ZmqSocketOption option)
at NetMQ.NetMQSocket.GetSocketOptionX[T](ZmqSocketOption option)
at NetMQ.NetMQSocket.get_HasIn()
Steps to reproduce the behaviour
A one-off on Alpine Linux, most probably when DNS disappears.
How to potentially fix
Remove Debug.Assert(ok);, just return value of m_commandPipe.TryRead. I'm not certain if caller of Mailbox.TryRead may check if command.Destination to be not zero when processing the command, i.e., reading a command with CommandType.Done sent by ZObject.SendDone(), which has no destination.
Environment
Expected behaviour
Mailbox.TryRead should not throw when returning a command for debug mode.
Actual behaviour
When run in debug mode
Debug.Assert(ok);may throw sincem_commandPipe.TryReadmay return false:Steps to reproduce the behaviour
A one-off on Alpine Linux, most probably when DNS disappears.
How to potentially fix
Remove
Debug.Assert(ok);, just return value ofm_commandPipe.TryRead. I'm not certain if caller ofMailbox.TryReadmay check ifcommand.Destinationto be not zero when processing the command, i.e., reading a command withCommandType.Donesent by ZObject.SendDone(), which has no destination.