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ts2 / ts2-sim-server

TS2 SimServer, the core of the TS2 Simulator
https://ts2.github.io
GNU General Public License v2.0
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Concurrent access error in multiplayer #43

Open Sharpe49 opened 4 years ago

Sharpe49 commented 4 years ago

Log : INFO[01-19|19:36:26] Train 2C01 arrived on time at station LIVERPOOL STREET module=simulation msgType=2 INFO[01-19|19:36:52] Train 5U53 entered the area 2 minutes late module=simulation msgType=2 fatal error: concurrent map read and map write

goroutine 16 [running]: runtime.throw(0x888993, 0x21) C:/Go/src/runtime/panic.go:617 +0x79 fp=0xc00155f4c8 sp=0xc00155f498 pc=0x42ed89 runtime.mapaccess1_faststr(0x7f89c0, 0xc0000a2780, 0xc000238d3c, 0x3, 0x3) C:/Go/src/runtime/map_faststr.go:21 +0x470 fp=0xc00155f538 sp=0xc00155f4c8 pc=0x4126b0 github.com/ts2/ts2-sim-server/plugins/points.StandardManager.Direction(...) C:/Users/gniew/Desktop/ts2-sim-server/plugins/points/points.go:35 github.com/ts2/ts2-sim-server/plugins/points.(*StandardManager).Direction(0xc0000805c0, 0xc0003918c0, 0x3)

:1 +0x85 fp=0xc00155f590 sp=0xc00155f538 pc=0x576515 github.com/ts2/ts2-sim-server/simulation.(*PointsItem).Reversed(...) C:/Users/gniew/Desktop/ts2-sim-server/simulation/track_points.go:145 github.com/ts2/ts2-sim-server/simulation.(*PointsItem).MarshalJSON(0xc0003918c0, 0x86ed20, 0xc0003918c0, 0x3051bd0, 0xc0003918c0, 0xc000391801) C:/Users/gniew/Desktop/ts2-sim-server/simulation/track_points.go:229 +0x9f fp=0xc00155f9b8 sp=0xc00155f590 pc=0x56349f encoding/json.marshalerEncoder(0xc000576150, 0x86ed20, 0xc0003918c0, 0x16, 0xc000390100) C:/Go/src/encoding/json/encode.go:454 +0xcf fp=0xc00155fa38 sp=0xc00155f9b8 pc=0x4fc0ff encoding/json.(*encodeState).reflectValue(0xc000576150, 0x86ed20, 0xc0003918c0, 0x16, 0xc000390100) C:/Go/src/encoding/json/encode.go:334 +0x89 fp=0xc00155fa70 sp=0xc00155fa38 pc=0x4fb769 encoding/json.interfaceEncoder(0xc000576150, 0x7f6a40, 0xc0016bf9a0, 0x194, 0x100) C:/Go/src/encoding/json/encode.go:620 +0xb4 fp=0xc00155fab8 sp=0xc00155fa70 pc=0x4fdad4 encoding/json.structEncoder.encode(0xc00072ad80, 0x2, 0x2, 0xc000576150, 0x81f460, 0xc0016bf990, 0x199, 0x100) C:/Go/src/encoding/json/encode.go:660 +0x30b fp=0xc00155fb58 sp=0xc00155fab8 pc=0x4fdfdb encoding/json.structEncoder.encode-fm(0xc000576150, 0x81f460, 0xc0016bf990, 0x199, 0x100) C:/Go/src/encoding/json/encode.go:631 +0x7d fp=0xc00155fba8 sp=0xc00155fb58 pc=0x50a26d encoding/json.structEncoder.encode(0xc00072ac60, 0x2, 0x2, 0xc000576150, 0x81f640, 0xc0016bf980, 0x199, 0x4f0100) C:/Go/src/encoding/json/encode.go:660 +0x30b fp=0xc00155fc48 sp=0xc00155fba8 pc=0x4fdfdb encoding/json.structEncoder.encode-fm(0xc000576150, 0x81f640, 0xc0016bf980, 0x199, 0xc0016b0100) C:/Go/src/encoding/json/encode.go:631 +0x7d fp=0xc00155fc98 sp=0xc00155fc48 pc=0x50a26d encoding/json.ptrEncoder.encode(0xc000862760, 0xc000576150, 0x7c9dc0, 0xc0016bf980, 0x16, 0x7c0100) C:/Go/src/encoding/json/encode.go:806 +0xb9 fp=0xc00155fce0 sp=0xc00155fc98 pc=0x4ff4b9 encoding/json.ptrEncoder.encode-fm(0xc000576150, 0x7c9dc0, 0xc0016bf980, 0x16, 0xc001550100) C:/Go/src/encoding/json/encode.go:801 +0x6b fp=0xc00155fd20 sp=0xc00155fce0 pc=0x50a47b encoding/json.(*encodeState).reflectValue(0xc000576150, 0x7c9dc0, 0xc0016bf980, 0x16, 0xd40100) C:/Go/src/encoding/json/encode.go:334 +0x89 fp=0xc00155fd58 sp=0xc00155fd20 pc=0x4fb769 encoding/json.(*encodeState).marshal(0xc000576150, 0x7c9dc0, 0xc0016bf980, 0x800100, 0x0, 0x0) C:/Go/src/encoding/json/encode.go:306 +0xf5 fp=0xc00155fda0 sp=0xc00155fd58 pc=0x4fb205 encoding/json.(*Encoder).Encode(0xc00155fe80, 0x7c9dc0, 0xc0016bf980, 0x2e040d8, 0xc0008483c0) C:/Go/src/encoding/json/stream.go:200 +0x91 fp=0xc00155fe30 sp=0xc00155fda0 pc=0x507d41 github.com/gorilla/websocket.(*Conn).WriteJSON(0xc0003821a0, 0x7c9dc0, 0xc0016bf980, 0x0, 0x1) C:/Users/gniew/go/pkg/mod/github.com/gorilla/websocket@v1.4.0/json.go:28 +0x10e fp=0xc00155fee0 sp=0xc00155fe30 pc=0x72f14e github.com/ts2/ts2-sim-server/server.(*connection).processWrite(0xc0003821a0, 0xa6e020, 0xc000bd4c80) C:/Users/gniew/Desktop/ts2-sim-server/server/connection.go:95 +0x136 fp=0xc00155ffc8 sp=0xc00155fee0 pc=0x77eac6 runtime.goexit() C:/Go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00155ffd0 sp=0xc00155ffc8 pc=0x4589d1 created by github.com/ts2/ts2-sim-server/server.(*connection).loop C:/Users/gniew/Desktop/ts2-sim-server/server/connection.go:59 +0x51f goroutine 1 [chan receive, 11 minutes]: main.main() C:/Users/gniew/Desktop/ts2-sim-server/main.go:124 +0xbd8 goroutine 19 [syscall, 11 minutes]: os/signal.signal_recv(0x0) C:/Go/src/runtime/sigqueue.go:139 +0xa3 os/signal.loop() C:/Go/src/os/signal/signal_unix.go:23 +0x29 created by os/signal.init.0 C:/Go/src/os/signal/signal_unix.go:29 +0x48 goroutine 4 [IO wait, 11 minutes]: internal/poll.runtime_pollWait(0x304cda0, 0x72, 0xa66f80) C:/Go/src/runtime/netpoll.go:182 +0x5d internal/poll.(*pollDesc).wait(0xc0001081c8, 0x72, 0xd10400, 0x0, 0x0) C:/Go/src/internal/poll/fd_poll_runtime.go:87 +0xa2 internal/poll.(*ioSrv).ExecIO(0xd4af50, 0xc000108018, 0xc00037a0e0, 0x1, 0x0, 0x1c4) C:/Go/src/internal/poll/fd_windows.go:228 +0x124 internal/poll.(*FD).acceptOne(0xc000108000, 0x1c4, 0xc00030a000, 0x2, 0x2, 0xc000108018, 0xd4e0c0, 0xc0000a9ad0, 0x40c44f, 0x10) C:/Go/src/internal/poll/fd_windows.go:864 +0xa9 internal/poll.(*FD).Accept(0xc000108000, 0xc00010e060, 0x0, 0x0, 0x0, 0x0, 0xc000000000, 0x0, 0x0, 0x0, ...) C:/Go/src/internal/poll/fd_windows.go:898 +0x148 net.(*netFD).accept(0xc000108000, 0xc000036a70, 0xc000036a00, 0x40bb93) C:/Go/src/net/fd_windows.go:193 +0x81 net.(*TCPListener).accept(0xc00091c018, 0xc0000a9c90, 0x4f64ee8e, 0x3d6a964b8d76a9b9) C:/Go/src/net/tcpsock_posix.go:139 +0x39 net.(*TCPListener).AcceptTCP(0xc00091c018, 0xc0002f6230, 0x4be3fd, 0x5e249f31) C:/Go/src/net/tcpsock.go:247 +0x4f net/http.tcpKeepAliveListener.Accept(0xc00091c018, 0xc0000a9d08, 0x18, 0xc000073080, 0x6f759b) C:/Go/src/net/http/server.go:3264 +0x36 net/http.(*Server).Serve(0xc0002f61a0, 0xa6d860, 0xc00091c018, 0x0, 0x0) C:/Go/src/net/http/server.go:2859 +0x234 net/http.(*Server).ListenAndServe(0xc0002f61a0, 0xc0002f61a0, 0xd) C:/Go/src/net/http/server.go:2797 +0xeb net/http.ListenAndServe(...) C:/Go/src/net/http/server.go:3037 github.com/ts2/ts2-sim-server/server.HttpdStart(0x879b6f, 0x7, 0x878283, 0x5) C:/Users/gniew/Desktop/ts2-sim-server/server/http.go:102 +0x7cc github.com/ts2/ts2-sim-server/server.Run(0xc000072d80, 0x879b6f, 0x7, 0x878283, 0x5) C:/Users/gniew/Desktop/ts2-sim-server/server/http.go:63 +0x207 created by main.main C:/Users/gniew/Desktop/ts2-sim-server/main.go:115 +0x92d goroutine 6 [runnable]: github.com/ts2/ts2-sim-server/server.(*Hub).run(0xc000122000, 0xc0000745a0) C:/Users/gniew/Desktop/ts2-sim-server/server/hub.go:71 +0x212 created by github.com/ts2/ts2-sim-server/server.Run C:/Users/gniew/Desktop/ts2-sim-server/server/http.go:60 +0xfd goroutine 8 [IO wait, 1 minutes]: internal/poll.runtime_pollWait(0x304ccd0, 0x72, 0xa66f80) C:/Go/src/runtime/netpoll.go:182 +0x5d internal/poll.(*pollDesc).wait(0xc000108748, 0x72, 0xd10400, 0x0, 0x0) C:/Go/src/internal/poll/fd_poll_runtime.go:87 +0xa2 internal/poll.(*ioSrv).ExecIO(0xd4af50, 0xc000108598, 0x9f11d8, 0x197, 0x0, 0x0) C:/Go/src/internal/poll/fd_windows.go:228 +0x124 internal/poll.(*FD).Read(0xc000108580, 0xc000378000, 0x400, 0x400, 0x0, 0x0, 0x0) C:/Go/src/internal/poll/fd_windows.go:502 +0x26b net.(*netFD).Read(0xc000108580, 0xc000378000, 0x400, 0x400, 0x83b9a0, 0x0, 0x0) C:/Go/src/net/fd_windows.go:152 +0x56 net.(*conn).Read(0xc00091c028, 0xc000378000, 0x400, 0x400, 0x0, 0x0, 0x0) C:/Go/src/net/net.go:177 +0x70 bufio.(*Reader).fill(0xc0007bec60) C:/Go/src/bufio/bufio.go:100 +0x116 bufio.(*Reader).Peek(0xc0007bec60, 0x2, 0x0, 0x83b9a0, 0xc00149d280, 0xc0000e06c0, 0xc00126ae50) C:/Go/src/bufio/bufio.go:138 +0x56 github.com/gorilla/websocket.(*Conn).read(0xc000382000, 0x2, 0x4f2631, 0x8, 0xa, 0xc00126ae40, 0x2) C:/Users/gniew/go/pkg/mod/github.com/gorilla/websocket@v1.4.0/conn.go:357 +0x47 github.com/gorilla/websocket.(*Conn).advanceFrame(0xc000382000, 0x0, 0x0, 0x30) C:/Users/gniew/go/pkg/mod/github.com/gorilla/websocket@v1.4.0/conn.go:787 +0x63 github.com/gorilla/websocket.(*Conn).NextReader(0xc000382000, 0x4534e0, 0xc0000741e0, 0xc000a119b8, 0xc000a119b8, 0x40c44f) C:/Users/gniew/go/pkg/mod/github.com/gorilla/websocket@v1.4.0/conn.go:947 +0xa7 github.com/gorilla/websocket.(*Conn).ReadJSON(0xc000382000, 0x7c9d40, 0xc00080c5c0, 0x0, 0x1) C:/Users/gniew/go/pkg/mod/github.com/gorilla/websocket@v1.4.0/json.go:50 +0x36 github.com/ts2/ts2-sim-server/server.(*connection).processRead(0xc000382000, 0xa6e020, 0xc000bd43c0) C:/Users/gniew/Desktop/ts2-sim-server/server/connection.go:72 +0xac github.com/ts2/ts2-sim-server/server.(*connection).loop(0xc000382000, 0xa6e020, 0xc000bd4280) C:/Users/gniew/Desktop/ts2-sim-server/server/connection.go:60 +0x544 github.com/ts2/ts2-sim-server/server.serveWs(0xa6d420, 0xc000362000, 0xc0002c4100) C:/Users/gniew/Desktop/ts2-sim-server/server/websocket.go:53 +0x2e4 net/http.HandlerFunc.ServeHTTP(0x9f1070, 0xa6d420, 0xc000362000, 0xc0002c4100) C:/Go/src/net/http/server.go:1995 +0x4b net/http.(*ServeMux).ServeHTTP(0xd4d280, 0xa6d420, 0xc000362000, 0xc0002c4100) C:/Go/src/net/http/server.go:2375 +0x1dd net/http.serverHandler.ServeHTTP(0xc0002f61a0, 0xa6d420, 0xc000362000, 0xc0002c4100) C:/Go/src/net/http/server.go:2774 +0xaf net/http.(*conn).serve(0xc000086000, 0xa6e020, 0xc000bd4000) C:/Go/src/net/http/server.go:1878 +0x858 created by net/http.(*Server).Serve C:/Go/src/net/http/server.go:2884 +0x2fb goroutine 51 [runnable]: encoding/json.stateBeginValue(0xc000fdf6c0, 0xc000fdf67b, 0x0) C:/Go/src/encoding/json/scanner.go:176 +0x58e encoding/json.compact(0xc000306000, 0xc000a18680, 0x182, 0x1a0, 0x1, 0x0, 0xc000920650) C:/Go/src/encoding/json/indent.go:39 +0x335 encoding/json.marshalerEncoder(0xc000306000, 0x86ed20, 0xc0003918c0, 0x16, 0xc000390100) C:/Go/src/encoding/json/encode.go:457 +0x1d7 encoding/json.(*encodeState).reflectValue(0xc000306000, 0x86ed20, 0xc0003918c0, 0x16, 0xc000390100) C:/Go/src/encoding/json/encode.go:334 +0x89 encoding/json.interfaceEncoder(0xc000306000, 0x7f6a40, 0xc0016bf970, 0x194, 0x100) C:/Go/src/encoding/json/encode.go:620 +0xb4 encoding/json.structEncoder.encode(0xc00072ad80, 0x2, 0x2, 0xc000306000, 0x81f460, 0xc0016bf960, 0x199, 0x100) C:/Go/src/encoding/json/encode.go:660 +0x30b encoding/json.structEncoder.encode(0xc00072ac60, 0x2, 0x2, 0xc000306000, 0x81f640, 0xc0016bf950, 0x199, 0x4f0100) C:/Go/src/encoding/json/encode.go:660 +0x30b encoding/json.ptrEncoder.encode(0xc000862760, 0xc000306000, 0x7c9dc0, 0xc0016bf950, 0x16, 0x7c0100) C:/Go/src/encoding/json/encode.go:806 +0xb9 encoding/json.(*encodeState).reflectValue(0xc000306000, 0x7c9dc0, 0xc0016bf950, 0x16, 0xd40100) C:/Go/src/encoding/json/encode.go:334 +0x89 encoding/json.(*encodeState).marshal(0xc000306000, 0x7c9dc0, 0xc0016bf950, 0x800100, 0x0, 0x0) C:/Go/src/encoding/json/encode.go:306 +0xf5 encoding/json.(*Encoder).Encode(0xc000503e80, 0x7c9dc0, 0xc0016bf950, 0x2e040d8, 0xc000fe7ce0) C:/Go/src/encoding/json/stream.go:200 +0x91 github.com/gorilla/websocket.(*Conn).WriteJSON(0xc000382000, 0x7c9dc0, 0xc0016bf950, 0x0, 0x1) C:/Users/gniew/go/pkg/mod/github.com/gorilla/websocket@v1.4.0/json.go:28 +0x10e github.com/ts2/ts2-sim-server/server.(*connection).processWrite(0xc000382000, 0xa6e020, 0xc000bd43c0) C:/Users/gniew/Desktop/ts2-sim-server/server/connection.go:95 +0x136 created by github.com/ts2/ts2-sim-server/server.(*connection).loop C:/Users/gniew/Desktop/ts2-sim-server/server/connection.go:59 +0x51f goroutine 45 [IO wait]: internal/poll.runtime_pollWait(0x304cc00, 0x72, 0xa66f80) C:/Go/src/runtime/netpoll.go:182 +0x5d internal/poll.(*pollDesc).wait(0xc000108a08, 0x72, 0xd10400, 0x0, 0x0) C:/Go/src/internal/poll/fd_poll_runtime.go:87 +0xa2 internal/poll.(*ioSrv).ExecIO(0xd4af50, 0xc000108858, 0x9f11d8, 0x197, 0x0, 0x0) C:/Go/src/internal/poll/fd_windows.go:228 +0x124 internal/poll.(*FD).Read(0xc000108840, 0xc000378400, 0x400, 0x400, 0x0, 0x0, 0x0) C:/Go/src/internal/poll/fd_windows.go:502 +0x26b net.(*netFD).Read(0xc000108840, 0xc000378400, 0x400, 0x400, 0x83b9a0, 0x0, 0x0) C:/Go/src/net/fd_windows.go:152 +0x56 net.(*conn).Read(0xc000836000, 0xc000378400, 0x400, 0x400, 0x0, 0x0, 0x0) C:/Go/src/net/net.go:177 +0x70 bufio.(*Reader).fill(0xc000392cc0) C:/Go/src/bufio/bufio.go:100 +0x116 bufio.(*Reader).Peek(0xc000392cc0, 0x2, 0x0, 0x83b9a0, 0xc00085f980, 0xc0000e06c0, 0xc0008bec38) C:/Go/src/bufio/bufio.go:138 +0x56 github.com/gorilla/websocket.(*Conn).read(0xc0003821a0, 0x2, 0x4f2631, 0x8, 0xa, 0xc0008bec50, 0x2) C:/Users/gniew/go/pkg/mod/github.com/gorilla/websocket@v1.4.0/conn.go:357 +0x47 github.com/gorilla/websocket.(*Conn).advanceFrame(0xc0003821a0, 0x0, 0x0, 0x30) C:/Users/gniew/go/pkg/mod/github.com/gorilla/websocket@v1.4.0/conn.go:787 +0x63 github.com/gorilla/websocket.(*Conn).NextReader(0xc0003821a0, 0x4534e0, 0xc0000741e0, 0xc0015639b8, 0xc0015639b8, 0x40c44f) C:/Users/gniew/go/pkg/mod/github.com/gorilla/websocket@v1.4.0/conn.go:947 +0xa7 github.com/gorilla/websocket.(*Conn).ReadJSON(0xc0003821a0, 0x7c9d40, 0xc0015f7c00, 0x0, 0x1) C:/Users/gniew/go/pkg/mod/github.com/gorilla/websocket@v1.4.0/json.go:50 +0x36 github.com/ts2/ts2-sim-server/server.(*connection).processRead(0xc0003821a0, 0xa6e020, 0xc000bd4c80) C:/Users/gniew/Desktop/ts2-sim-server/server/connection.go:72 +0xac github.com/ts2/ts2-sim-server/server.(*connection).loop(0xc0003821a0, 0xa6e020, 0xc000bd4b80) C:/Users/gniew/Desktop/ts2-sim-server/server/connection.go:60 +0x544 github.com/ts2/ts2-sim-server/server.serveWs(0xa6d420, 0xc0003620e0, 0xc0002c4200) C:/Users/gniew/Desktop/ts2-sim-server/server/websocket.go:53 +0x2e4 net/http.HandlerFunc.ServeHTTP(0x9f1070, 0xa6d420, 0xc0003620e0, 0xc0002c4200) C:/Go/src/net/http/server.go:1995 +0x4b net/http.(*ServeMux).ServeHTTP(0xd4d280, 0xa6d420, 0xc0003620e0, 0xc0002c4200) C:/Go/src/net/http/server.go:2375 +0x1dd net/http.serverHandler.ServeHTTP(0xc0002f61a0, 0xa6d420, 0xc0003620e0, 0xc0002c4200) C:/Go/src/net/http/server.go:2774 +0xaf net/http.(*conn).serve(0xc0001441e0, 0xa6e020, 0xc000bd49c0) C:/Go/src/net/http/server.go:1878 +0x858 created by net/http.(*Server).Serve C:/Go/src/net/http/server.go:2884 +0x2fb goroutine 49 [select]: github.com/ts2/ts2-sim-server/simulation.(*Simulation).run(0xc000072d80) C:/Users/gniew/Desktop/ts2-sim-server/simulation/simulation.go:297 +0x106 created by github.com/ts2/ts2-sim-server/simulation.(*Simulation).Start C:/Users/gniew/Desktop/ts2-sim-server/simulation/simulation.go:288 +0x7a goroutine 59 [runnable]: github.com/ts2/ts2-sim-server/simulation.(*trackStruct).setActiveRoute(0xc0008227e0, 0xc000030c00, 0xa752c0, 0xc000270420) C:/Users/gniew/Desktop/ts2-sim-server/simulation/track_items.go:369 +0x11f github.com/ts2/ts2-sim-server/simulation.(*Route).Activate(0xc000030c00, 0xc00090cf00, 0xc00086a350, 0x2) C:/Users/gniew/Desktop/ts2-sim-server/simulation/routes.go:132 +0x5f3 github.com/ts2/ts2-sim-server/server.(*routeObject).dispatch(0xd680c8, 0xc000122000, 0x29, 0xc0008bec62, 0x5, 0xc0008bec68, 0x8, 0xc000176360, 0x21, 0x30, ...) C:/Users/gniew/Desktop/ts2-sim-server/server/hub_route.go:83 +0x2d50 github.com/ts2/ts2-sim-server/server.(*Hub).dispatchObject(0xc000122000, 0xc0003821a0) C:/Users/gniew/Desktop/ts2-sim-server/server/hub.go:177 +0x58d created by github.com/ts2/ts2-sim-server/server.(*Hub).run C:/Users/gniew/Desktop/ts2-sim-server/server/hub.go:77 +0x725
npiganeau commented 4 years ago

I've just pushed a fix on master branch for this. Hoping this will help.

Sharpe49 commented 4 years ago

Alright, there is no crash, but when the server seems to freeze at a moment. The GUI is responding but not the server. Perhaps a mutex is not unlocked properly. I also tested it without the patch for the other issue. Same problem. We should probably do a test session together.

Sharpe49 commented 3 years ago

@npiganeau Ok, it is still not fixed. It went back to the same error of the first message.

npiganeau commented 3 years ago

@Sharpe49 Do you have the stack trace? I suppose it is a different map where we have a concurrent read/write.

npiganeau commented 3 years ago

I removed two other copied mutexes.

Can you test multiplayer-fix branch ? (PR #52 )

Sharpe49 commented 3 years ago

Ok, we had a freeze with this version. It happened when a train entered the map. And some messages were received after the start of the freeze (a train entered the map).

npiganeau commented 3 years ago

@Sharpe49 I'm trying to reproduce with a unit test but I couldn't.

Do you have a way to reproduce the bug ? Or perhaps more information to help find the issue ?

Sharpe49 commented 3 years ago

We probably have to do tests together.

npiganeau commented 3 years ago

@Sharpe49 I finally managed to reproduce in unit tests. There were massive data races and locks. I rewrote almost all the concurrent logic to bring the simulation logic back on a single thread and removed almost all mutexes.

My tests do not race nor freeze anymore.

Can you test on your side too ?

Tell me also if you see bad side effects of this rewrite.

Sharpe49 commented 3 years ago

After pulling and compiling, we did a test with 2 players, we had a freeze during a route setting. Parts of the route were starting to become white on the screen when the server froze for us both.

npiganeau commented 3 years ago

Ok. We'll do tests together then. I send you an email.

npiganeau commented 3 years ago

@Sharpe49 Following our tests, I updated the multiplayer-fix branch with non-blocking client notifications.

Can you test again and tell me if you still encounter simulation freeze ?

Sharpe49 commented 3 years ago

We did two long tests on Gretz and London Liverpool Street. It seems to work. We will try to do some other tests sessions to confirm that.