Interrupted system call error

[nullproxy]

I encountered this error during testing locally with $ katana service action via CLI:

Callback error: Language error (shutdown) (1) Uncaught ZMQSocketException: Failed to get the option ZMQ::SOCKOPT_EVENTS value: Interrupted system call in /vendor/react/zmq/src/React/ZMQ/SocketWrapper.php:35
Stack trace:
#0 /vendor/react/zmq/src/React/ZMQ/SocketWrapper.php(35): ZMQSocket->getsockopt(15)
#1 [internal function]: React\ZMQ\SocketWrapper->handleEvent(Resource id #44, Object(React\EventLoop\StreamSelectLoop))
#2 /vendor/react/event-loop/src/StreamSelectLoop.php(236): call_user_func(Array, Resource id #44, Object(React\EventLoop\StreamSelectLoop))
#3 /vendor/react/event-loop/src/StreamSelectLoop.php(205): React\EventLoop\StreamSelectLoop->waitForStreamActivity(98379)
#4 /vendor/kusanagi/katana-sdk-php7/src/Executor/ZeroMqLoopExecutor.php(146): React\EventLoop\StreamSelectLoop->ru...

This happened randomly during various calls, with no change to the configuration or source code.

This was using version 1.1.12 of the framework, with system info below:

Linux work 4.2.0-42-generic #49~14.04.1-Ubuntu SMP Wed Jun 29 20:22:11 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux