Precompilation spits out Task object, followed by segfaults during runtime, on 1.9

[IanButterworth]

See #1195 (comment)

(HTTP) pkg> precompile
Precompiling project...
  1 dependency successfully precompiled in 9 seconds. 16 already precompiled.
  1 dependency had output during precompilation:
┌ HTTP [cd3eb016-35fb-5094-929b-558a96fad6f3]
│  Task
│  Task(next=Task(next=nothing, queue=Base.IntrusiveLinkedList{Task}(head=<circular reference @-3>, tail=<circular reference @-2>), storage=nothing, donenotify=Base.GenericCondition{Base.Threads.SpinLock}(waitq=Base.IntrusiveLinkedList{Task}(head=nothing, tail=nothing), lock=Base.Threads.SpinLock(owned=0)), result=nothing, logstate=nothing, code=HTTP.Servers.var"#16#17"{HTTP.Handlers.var"#1#2"{HTTP.var"#50#52"}, HTTP.Servers.Listener{MbedTLS.SSLConfig, Sockets.TCPServer}, Base.Set{HTTP.Connections.Connection{IO_t} where IO_t<:IO}, Int64, Nothing, Base.ReentrantLock, Int64, Base.Semaphore, HTTP.Connections.Connection{MbedTLS.SSLContext}}(f=HTTP.Handlers.var"#1#2"{HTTP.var"#50#52"}(handler=HTTP.var"#50#52"()), listener=HTTP.Servers.Listener{MbedTLS.SSLConfig, Sockets.TCPServer}(addr=Sockets.InetAddr{Sockets.IPv4}(host=Sockets.IPv4(host=0x00000000), port=0xe1d5), hostname="0.0.0.0", hostport="57813", ssl=MbedTLS.SSLConfig(data=0x0000000144f155d0, rng=MbedTLS.CtrDrbg(data=0x0000000144f160b0, entropy=MbedTLS.Entropy(data=0x0000000138200000, sources=Array{Any, (0,)}[])), chain=#<null>, dbg=MbedTLS.tls_dbg, cert=MbedTLS.CRT(data=0x0000000144f14870), key=MbedTLS.PKContext(data=0x00006000022b4be0), alpn_protos=#<null>), server=Sockets.TCPServer(handle=0x0000600001d3bde0, status=6, cond=Base.GenericCondition{Base.Threads.SpinLock}(waitq=Base.IntrusiveLinkedList{Task}(head=nothing, tail=nothing), lock=Base.Threads.SpinLock(owned=0)))), conns=Base.Set{HTTP.Connections.Connection{IO_t} where IO_t<:IO}(dict=Base.Dict{HTTP.Connections.Connection{IO_t} where IO_t<:IO, Nothing}(slots=Array{UInt8, (16,)}[0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xec, 0x00, 0x00, 0x00], keys=Array{HTTP.Connections.Connection{IO_t} where IO_t<:IO, (16,)}[
│    #<null>,
│    #<null>,
│    #<null>,
│    #<null>,
│    #<null>,
│    #<null>,
│    #<null>,
│    #<null>,
│    #<null>,
│    #<null>,
│    #<null>,
│    #<null>,
│    HTTP.Connections.Connection{MbedTLS.SSLContext}(host="0.0.0.0", port="57813", idle_timeout=0, require_ssl_verification=true, keepalive=true, peerip=Sockets.IPv4(host=0x7f000001), peerport=0xfa41, localport=0xe1d5, io=MbedTLS.SSLContext(data=0x0000000144f6b5b0, datalock=Base.ReentrantLock(locked_by=nothing, reentrancy_cnt=0x00000000, havelock=0x00, cond_wait=Base.GenericCondition{Base.Threads.SpinLock}(waitq=Base.IntrusiveLinkedList{Task}(head=nothing, tail=nothing), lock=Base.Threads.SpinLock(owned=0)), _=(0, 0, 0)), waitlock=Base.ReentrantLock(locked_by=nothing, reentrancy_cnt=0x00000000, havelock=0x00, cond_wait=Base.GenericCondition{Base.Threads.SpinLock}(waitq=Base.IntrusiveLinkedList{Task}(head=nothing, tail=nothing), lock=Base.Threads.SpinLock(owned=0)), _=(0, 0, 0)), config=MbedTLS.SSLConfig(data=0x0000000144f155d0, rng=MbedTLS.CtrDrbg(data=0x0000000144f160b0, entropy=MbedTLS.Entropy(data=0x0000000138200000, sources=Array{Any, (0,)}[])), chain=#<null>, dbg=MbedTLS.tls_dbg, cert=MbedTLS.CRT(data=0x0000000144f14870), key=MbedTLS.PKContext(data=0x00006000022b4be0), alpn_protos=#<null>), isreadable=false, bytesavailable=0, close_notify_sent=true, bio=Sockets.TCPSocket(handle=0x0000600001d30000, status=6, buffer=Base.GenericIOBuffer{Array{UInt8, 1}}(data=Array{UInt8, (65536,)}[0x17, 0x03, 0x03, 0x00, 0x8b, 0x4c, 0xab, 0x32, 0x27, 0
...