The error messages highlighted in #21933 (comment) , which used to appear in both Linux and Windows logs have been fixed by this PR.

However, there is still a different spurious error log in the 64-bit linux run (reproduced below).

EOFError()CapturedException(EOFError()CapturedException(EOFError(), EOFError(), 
Any[(Any[(unsafe_read(::Base.AbstractIOBuffer{Array{UInt8,1}}, ::Ptr{UInt8}, ::UInt64) at iobuffer.jl:105, 1), (unsafe_read(::TCPSocket, ::Ptr{UInt8}, ::UInt64) at stream.jl:752, 1), 
(unsafe_read(::TCPSocket, ::Base.RefValue{NTuple{4,Int64}}, ::Int64) at io.jl:362, 1), (read at 
io.jl:364 [inlined], 1), (deserialize_hdr_raw at messages.jl:170 [inlined], 1), \(message_handler_loop(::TCPSocket, ::TCPSocket, ::Bool) at process_messages.jl:157, 1), 
(process_tcp_streams(::TCPSocket, ::TCPSocket, ::Bool) at process_messages.jl:118, 1), 
(EOFError()CapturedException((::Base.Distributed.##99#100{TCPSocket,TCPSocket,Bool})
()EOFError(), Any[(

I'll go ahead and merge this PR in a day as it fixes one known issue.

BTW, should these make CI fail maybe? Otherwise, they can easily go unnoticed.

No, they are not errors. Any spurious connection attempt to a worker will result in a Unknown remote, closing connection. error message being displayed. I don't know why/who in the Travis/AV setup is attempting a connection.

I do not see them on my local OSX setup, nor did I see it during a test I ran on a Linux system.

This is still happening - https://travis-ci.org/JuliaLang/julia/jobs/244155807. Looks pretty alarming in the logs, and I've seen it locally too.

I think this is the same issue: https://travis-ci.org/JuliaLang/julia/jobs/244336112