Is.. is this a race condition when two goroutines are trying to write to the standard output?

goroutine

goroutine profile: total 6
1 @ 0x77952f 0x7792fa 0x774bdb 0x616d55 0x616f77 0x5246e1 0x525f84 0x526b45 0x5233f5 0x4818e1
#	0x77952f	runtime/pprof.writeRuntimeProfile+0xbf	C:/Go/src/runtime/pprof/pprof.go:545
#	0x7792fa	runtime/pprof.writeGoroutine+0x9a	C:/Go/src/runtime/pprof/pprof.go:507
#	0x774bdb	runtime/pprof.(*Profile).WriteTo+0xdb	C:/Go/src/runtime/pprof/pprof.go:236
#	0x616d55	net/http/pprof.handler.ServeHTTP+0x385	C:/Go/src/net/http/pprof/pprof.go:210
#	0x616f77	net/http/pprof.Index+0x207		C:/Go/src/net/http/pprof/pprof.go:222
#	0x5246e1	net/http.HandlerFunc.ServeHTTP+0x41	C:/Go/src/net/http/server.go:1618
#	0x525f84	net/http.(*ServeMux).ServeHTTP+0x184	C:/Go/src/net/http/server.go:1910
#	0x526b45	net/http.serverHandler.ServeHTTP+0x1a5	C:/Go/src/net/http/server.go:2081
#	0x5233f5	net/http.(*conn).serve+0xf35		C:/Go/src/net/http/server.go:1472

1 @ 0x45359c 0x45366b 0x4631ac 0x462dcd 0x662f6b 0x55f5cb 0x55ae17 0x486c1c 0x486cda 0x6f1fa3 0x6f2b30 0x6631db 0x6f09cc 0x57ed22 0x41070d 0x40ed89 0x41b92b 0x45318e 0x4818e1
#	0x462dcd	sync.runtime_Semacquire+0x2d					C:/Go/src/runtime/sema.go:47
#	0x662f6b	sync.(*Mutex).Lock+0x1cb					C:/Go/src/sync/mutex.go:83
#	0x55f5cb	os.(*File).write+0x7b						C:/Go/src/os/file_windows.go:395
#	0x55ae17	os.(*File).Write+0x97						C:/Go/src/os/file.go:136
#	0x486c1c	fmt.Fprint+0xac							C:/Go/src/fmt/print.go:223
#	0x486cda	fmt.Print+0x7a							C:/Go/src/fmt/print.go:232
#	0x6f1fa3	github.com/itchio/butler/pb.(*ProgressBar).write+0x15b3		C:/Multi-Runner/builds/58469115/1/itchio/butler/src/github.com/itchio/butler/pb/pb.go:331
#	0x6f2b30	github.com/itchio/butler/pb.(*ProgressBar).Finish.func1+0x70	C:/Multi-Runner/builds/58469115/1/itchio/butler/src/github.com/itchio/butler/pb/pb.go:196
#	0x6631db	sync.(*Once).Do+0xeb						C:/Go/src/sync/once.go:44
#	0x6f09cc	github.com/itchio/butler/pb.(*ProgressBar).Finish+0x4c		C:/Multi-Runner/builds/58469115/1/itchio/butler/src/github.com/itchio/butler/pb/pb.go:201
#	0x57ed22	github.com/itchio/butler/comm.EndProgress+0x92			C:/Multi-Runner/builds/58469115/1/itchio/butler/src/github.com/itchio/butler/comm/progress.go:149
#	0x41070d	main.doPush+0x194d						C:/Multi-Runner/builds/58469115/1/itchio/butler/src/github.com/itchio/butler/push.go:267
#	0x40ed89	main.push+0x79							C:/Multi-Runner/builds/58469115/1/itchio/butler/src/github.com/itchio/butler/push.go:24
#	0x41b92b	main.main+0xc8b							C:/Multi-Runner/builds/58469115/1/itchio/butler/src/github.com/itchio/butler/main.go:334
#	0x45318e	runtime.main+0x27e						C:/Go/src/runtime/proc.go:188

1 @ 0x4818e1

1 @ 0x45359c 0x44d065 0x44c527 0x4a5201 0x4a6417 0x4a99fc 0x4a9f63 0x4c5584 0x527d58 0x526e90 0x526cdd 0x5273ff 0x41f040 0x4818e1
#	0x44c527	net.runtime_pollWait+0x67			C:/Go/src/runtime/netpoll.go:160
#	0x4a5201	net.(*pollDesc).Wait+0x41			C:/Go/src/net/fd_poll_runtime.go:73
#	0x4a6417	net.(*ioSrv).ExecIO+0x177			C:/Go/src/net/fd_windows.go:183
#	0x4a99fc	net.(*netFD).acceptOne+0x26c			C:/Go/src/net/fd_windows.go:583
#	0x4a9f63	net.(*netFD).accept+0x173			C:/Go/src/net/fd_windows.go:613
#	0x4c5584	net.(*TCPListener).AcceptTCP+0x54		C:/Go/src/net/tcpsock_posix.go:254
#	0x527d58	net/http.tcpKeepAliveListener.Accept+0x48	C:/Go/src/net/http/server.go:2427
#	0x526e90	net/http.(*Server).Serve+0x130			C:/Go/src/net/http/server.go:2117
#	0x526cdd	net/http.(*Server).ListenAndServe+0x13d		C:/Go/src/net/http/server.go:2098
#	0x5273ff	net/http.ListenAndServe+0x9f			C:/Go/src/net/http/server.go:2195
#	0x41f040	main.setupHTTPDebug.func1+0x50			C:/Multi-Runner/builds/58469115/1/itchio/butler/src/github.com/itchio/butler/main.go:393

1 @ 0x460f30 0x41e76a 0x4818e1
#	0x41e76a	main.doPush.func2+0x7a	C:/Multi-Runner/builds/58469115/1/itchio/butler/src/github.com/itchio/butler/push.go:175

1 @ 0x424767 0x46d15c 0x5ffb21 0x55f3b2 0x55f649 0x55ae17 0x486c1c 0x486cda 0x6f1fa3 0x6f2879 0x6f29d1 0x4818e1
#	0x46d15c	syscall.Syscall6+0x5c					C:/Go/src/runtime/syscall_windows.go:139
#	0x5ffb21	syscall.WriteConsole+0xb1				C:/Go/src/syscall/zsyscall_windows.go:1250
#	0x55f3b2	os.(*File).writeConsole+0x512				C:/Go/src/os/file_windows.go:382
#	0x55f649	os.(*File).write+0xf9					C:/Go/src/os/file_windows.go:398
#	0x55ae17	os.(*File).Write+0x97					C:/Go/src/os/file.go:136
#	0x486c1c	fmt.Fprint+0xac						C:/Go/src/fmt/print.go:223
#	0x486cda	fmt.Print+0x7a						C:/Go/src/fmt/print.go:232
#	0x6f1fa3	github.com/itchio/butler/pb.(*ProgressBar).write+0x15b3	C:/Multi-Runner/builds/58469115/1/itchio/butler/src/github.com/itchio/butler/pb/pb.go:331
#	0x6f2879	github.com/itchio/butler/pb.(*ProgressBar).Update+0x69	C:/Multi-Runner/builds/58469115/1/itchio/butler/src/github.com/itchio/butler/pb/pb.go:355
#	0x6f29d1	github.com/itchio/butler/pb.(*ProgressBar).writer+0x101	C:/Multi-Runner/builds/58469115/1/itchio/butler/src/github.com/itchio/butler/pb/pb.go:372

WHY WINDOWS WHY

WHY WINDOWS WHY

pressing enter fixed it. Working theory involves scrolling. Still pretty poop.