fatal error: concurrent map read and map write

[nickdooley2016]

Using go 1.18.3 which seems to be the culprit. Any Ideas?

fatal error: concurrent map read and map write

goroutine 35790993 [running]:
runtime.throw({0xeca7f7?, 0xc000113000?})
C:/Program Files/Go/src/runtime/panic.go:992 +0x71 fp=0xc028462cc0 sp=0xc028462c90 pc=0x4343f1
runtime.mapaccess1_faststr(0xeafd82?, 0xc0356dc810?, {0xeafd82, 0x5})
C:/Program Files/Go/src/runtime/map_faststr.go:22 +0x3a5 fp=0xc028462d28 sp=0xc028462cc0 pc=0x412aa5
net/textproto.MIMEHeader.Get(0xc0356dc810, {0xeafd82?, 0x100000000?})
C:/Program Files/Go/src/net/textproto/header.go:34 +0x45 fp=0xc028462d58 sp=0xc028462d28 pc=0x689b25
net/http.Header.Get(...)
C:/Program Files/Go/src/net/http/header.go:49
golang.org/x/net/http2.(*clientStream).writeRequest(0xc00b4a8600, 0xc03438ed00)
C:/Users/work/go/pkg/mod/golang.org/x/net@v0.0.0-20220225172249-27dd8689420f/http2/transport.go:1254 +0x347 fp=0xc028462f90 sp=0xc028462d58 pc=0xaa7fc7
golang.org/x/net/http2.(*clientStream).doRequest(0xc02ce975c0?, 0x12?)
C:/Users/work/go/pkg/mod/golang.org/x/net@v0.0.0-20220225172249-27dd8689420f/http2/transport.go:1202 +0x1e fp=0xc028462fc0 sp=0xc028462f90 pc=0xaa7c3e
golang.org/x/net/http2.(*ClientConn).RoundTrip.func3()
C:/Users/work/go/pkg/mod/golang.org/x/net@v0.0.0-20220225172249-27dd8689420f/http2/transport.go:1131 +0x2a fp=0xc028462fe0 sp=0xc028462fc0 pc=0xaa7bea
runtime.goexit()
C:/Program Files/Go/src/runtime/asm_amd64.s:1571 +0x1 fp=0xc028462fe8 sp=0xc028462fe0 pc=0x4643c1
created by golang.org/x/net/http2.(*ClientConn).RoundTrip
C:/Users/work/go/pkg/mod/golang.org/x/net@v0.0.0-20220225172249-27dd8689420f/http2/transport.go:1131 +0x30a

[Gasoid]

Could you be so kind to send snippet of your code or example?

[Kamandlou]

Use sync.Map.
Visit this link:
https://stackoverflow.com/questions/59294816/converting-standard-golang-map-into-a-sync-map-to-avoid-race-condition