I ran into this on go 1.6.2 amd64, seems unlikely this is a core issue and 
I need to look else where in the project but has anyone seen this before?

fatal error: concurrent map read and map write

goroutine 21619 [running]:
runtime.throw(0xfefc00, 0x21)
        /usr/local/go/src/runtime/panic.go:547 +0x90 fp=0xc822727ac0 
sp=0xc822727aa8
runtime.mapaccess1(0xca4a00, 0xc828346120, 0xc822727c58, 0x1931c00)
        /usr/local/go/src/runtime/hashmap.go:289 +0x5a fp=0xc822727b08 
sp=0xc822727ac0
net/http.(*Transport).tryPutIdleConn(0xc822c00b40, 0xc82181fc70, 0x0, 0x0)
        /usr/local/go/src/net/http/transport.go:562 +0x41e fp=0xc822727c90 
sp=0xc822727b08
net/http.(*persistConn).readLoop.func2(0xc82181fc70)
        /usr/local/go/src/net/http/transport.go:1053 +0x32 fp=0xc822727cd0 
sp=0xc822727c90
net/http.(*persistConn).readLoop(0xc82181fc70)
        /usr/local/go/src/net/http/transport.go:1189 +0xc5d fp=0xc822727fa8 
sp=0xc822727cd0
runtime.goexit()
        /usr/local/go/src/runtime/asm_amd64.s:1998 +0x1 fp=0xc822727fb0 
sp=0xc822727fa8
created by net/http.(*Transport).dialConn
        /usr/local/go/src/net/http/transport.go:857 +0x10a6

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