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gnolang / gnochess

User-friendly chess dApp in Gno ecosystem
https://gnochess.com
GNU General Public License v3.0
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Backend: Error: VM call panic: unexpected object with id c00e762742cf910938141c9647849974ef56ce9d:30 #97

Closed ajnavarro closed 9 months ago

ajnavarro commented 9 months ago

I got that error after having a match stuck, trying to refresh the browsers to start over.

thehowl commented 9 months ago

I believe this was related to 7da3a8d, as the panic seems to be an issue with realm storage and this panic seemed to occur in relation to that. If nobody has seen this anymore I think we can close this

thehowl commented 9 months ago

Nope, confirming this still happens. (always with the same hash.) I don't precise steps to follow, though this seems to happen on LobbyJoin from time to time.

Some more information:

This is the stacktrace I get:

'msg:0,success:false,log:--= Error =--
Data: &errors.errorString{s:"unexpected object with id c00e762742cf910938141c9647849974ef56ce9d:29"}
Msg Traces:
    0  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/gno.land/pkg/sdk/vm/keeper.go:266 - VM call panic: unexpected object with id c00e762742cf910938141c9647849974ef56ce9d:29
Machine:
    CheckTypes: false
    Op: [OpHalt OpExec OpBody OpPopResults OpExec OpBody OpRangeIter OpPopBlock OpBody OpPopResults OpExec OpBody OpDefine OpBody OpDefine OpRef OpStructLit OpEval OpEval OpEval OpEval OpBody OpReturn OpStructLit OpEval OpEval OpBody OpReturn]
    Values: (len: 12)
          #11 (NewBoard func()( gno.land/r/demo/chess.Board))
          #10 (typeval{gno.land/r/demo/chess.Position (0xc009766a80)} type{})
          #9 (NewPosition func()( gno.land/r/demo/chess.Position))
          #8 ("g1qw75vnhcmma85qpyupdde2ecv6fu0cs45flev7" std.Address)
          #7 ("g1malmzy5qlfe0d35l70axscmqm6nwc3aywm26xy" std.Address)
          #6 ("000000002" string)
          #5 (typeval{gno.land/r/demo/chess.Game (0xc009766a20)} type{})
          #4 (newGame func(caller std.Address,opponent std.Address,seconds int,increment int)( *gno.land/r/demo/chess.Game))
          #3 (lobbyMatch func(tc gno.land/r/demo/chess.tcLobby,p1 int,p2 int)())
          #2 (slice[(struct{(ref(c00e762742cf910938141c9647849974ef56ce9d:52) time.Time),(struct{(13924100730999799808 uint64),(1695606750000000001 int64),(%!!(MISSING)v(PANIC=String method: runtime error: invalid memory address or nil pointer dereference) *time.Location)} time.Time),(&0xc00cdec210.(*gno.land/r/demo/chess.Player) *gno.land/r/demo/chess.Player)} gno.land/r/demo/chess.lobbyPlayer),(struct{(struct{(13924100733147283456 uint64),(1695606752000000001 int64),(&0xc006d2e808.(*time.Location) *time.Location)} time.Time),(struct{(13924100733147283456 uint64),(1695606752000000001 int64),(&0xc006d2e808.(*time.Location) *time.Location)} time.Time),(&0xc00ce39980.(*gno.land/r/demo/chess.Player) *gno.land/r/demo/chess.Player)} gno.land/r/demo/chess.lobbyPlayer)] []gno.land/r/demo/chess.lobbyPlayer)
          #1 (refreshLobby func(tc gno.land/r/demo/chess.tcLobby)())
          #0 (LobbyJoin func(seconds int,increment int)())
    Exprs:
          #8 (const (make func(t type{},z ...interface{})( []gno.land/r/demo/chess.Move)))([]Move<VPBlock(3,4)>, (const (0 int)), (const (80 int)))
          #7 [](const-type uint64){(const (1957848132405881468 uint64))}
          #6 Position<VPBlock(3,1)>{B<VPField(0,0,B)>: NewBoard<VPBlock(3,69)>(), Moves<VPField(0,1,Moves)>: (const (make func(t type{},z ...interface{})( []gno.land/r/demo/chess.Move)))([]Move<VPBlock(3,4)>, (const (0 int)), (const (80 int))), Hashes<VPField(0,4,Hashes)>: [](const-type uint64){(const (1957848132405881468 uint64))}}
          #5 (const (1 gno.land/r/demo/chess.GameState))
          #4 caller<VPBlock(1,0)>
          #3 time<VPBlock(2,4)>.Now()
          #2 NewTimeControl<VPBlock(3,72)>(seconds<VPBlock(1,2)>, increment<VPBlock(1,3)>)
          #1 Game<VPBlock(3,0)>{ID<VPField(0,0,ID)>: id<VPBlock(1,7)>, White<VPField(0,1,White)>: caller<VPBlock(1,0)>, Black<VPField(0,2,Black)>: opponent<VPBlock(1,1)>, Position<VPField(0,3,Position)>: NewPosition<VPBlock(3,66)>(), State<VPField(0,4,State)>: (const (1 gno.land/r/demo/chess.GameState)), Creator<VPField(0,6,Creator)>: caller<VPBlock(1,0)>, CreatedAt<VPField(0,7,CreatedAt)>: time<VPBlock(2,4)>.Now(), Time<VPField(0,10,Time)>: NewTimeControl<VPBlock(3,72)>(seconds<VPBlock(1,2)>, increment<VPBlock(1,3)>)}
          #0 &(Game<VPBlock(3,0)>{ID<VPField(0,0,ID)>: id<VPBlock(1,7)>, White<VPField(0,1,White)>: caller<VPBlock(1,0)>, Black<VPField(0,2,Black)>: opponent<VPBlock(1,1)>, Position<VPField(0,3,Position)>: NewPosition<VPBlock(3,66)>(), State<VPField(0,4,State)>: (const (1 gno.land/r/demo/chess.GameState)), Creator<VPField(0,6,Creator)>: caller<VPBlock(1,0)>, CreatedAt<VPField(0,7,CreatedAt)>: time<VPBlock(2,4)>.Now(), Time<VPField(0,10,Time)>: NewTimeControl<VPBlock(3,72)>(seconds<VPBlock(1,2)>, increment<VPBlock(1,3)>)})
    Stmts:
          #10 bodyStmt[0/0/1]=(end)
          #9 bodyStmt[0/0/1]=(end)
          #8 bodyStmt[0/0/8]=if isBlack<VPBlock(2,6)> { g<VPBlock(2,8)>.White, g<VPBlock(2,8)>.Black = g<VPBlock(2,8)>.Black, g<VPBlock(2,8)>.White }*
          #7 bodyStmt[0/0/3]=if (const-type bool)(p1<VPBlock(2,1)> > p2<VPBlock(2,2)>) { p1<VPBlock(2,1)>, p2<VPBlock(2,2)> = p2<VPBlock(2,2)>, p1<VPBlock(2,1)> }*
          #6 return
          #5 bodyStmt[0/0/1]=return
          #4 bodyStmt[2/0/3]=(end)
          #3 bodyStmt[0/0/13]=(end)
          #2 return
          #1 bodyStmt[0/0/11]=(end)
          #0 return
    Blocks:
          @(1) Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc0043a9680,Source:func NewBoard()  Board<VPBlock(2...,Parent:0xc003f361e0)
            .res_0: (array[0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000] gno.land/r/demo/chess.Board)
 (s vals) @(1) Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc009348020,Source:func NewBoard()  Board<VPBlock(2...,Parent:0xc00cc118e0)
            .res_0: (nil gno.land/r/demo/chess.Board)
 (s typs) @(1) [gno.land/r/demo/chess.Board]
          @(2) Block(ID:c00e762742cf910938141c9647849974ef56ce9d:8,Addr:0xc003f361e0,Source:ref(gno.land/r/demo/chess/rules....,Parent:0xc003455680)
            (RefNode names not shown)
 (s vals) @(2) Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc00cc118e0,Source:file{ package chess; import erro...,Parent:0xc00cf5cde0)
            errors: (package(errors errors) package{})
            sort: (package(sort sort) package{})
            strconv: (package(strconv strconv) package{})
            strings: (package(strings strings) package{})
 (s typs) @(2) [package{} package{} package{} package{}]
          @(3) gno.land/r/demo/chess
    Blocks (other):
          #7 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc0043a94a0,Source:func NewPosition()  Position<VPB...,Parent:0xc003f361e0)
            .res_0: (struct{(array[0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000] gno.land/r/demo/chess.Board),(nil []gno.land/r/demo/chess.Move),(0 gno.land/r/demo/chess.PositionFlags),(0 uint16),(nil []uint64)} gno.land/r/demo/chess.Position)
 (static) #7 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc009202c20,Source:func NewPosition()  Position<VPB...,Parent:0xc00cc118e0)
            .res_0: (nil gno.land/r/demo/chess.Position)
          #6 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc004393860,Source:func newGame(caller std<VPBlock(...,Parent:0xc003455860)
            caller: ("g1malmzy5qlfe0d35l70axscmqm6nwc3aywm26xy" std.Address)
            opponent: ("g1qw75vnhcmma85qpyupdde2ecv6fu0cs45flev7" std.Address)
            seconds: (600 int)
            increment: (5 int)
            .res_0: (nil *gno.land/r/demo/chess.Game)
            games: (slice[(&0xc00cdd6ae0.(*gno.land/r/demo/chess.Game) *gno.land/r/demo/chess.Game)] []*gno.land/r/demo/chess.Game)
            isBlack: (true bool)
            id: ("000000002" string)
            g: (undefined)
 (static) #6 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc00cf5ac20,Source:func newGame(caller std<VPBlock(...,Parent:0xc001a58b20)
            caller: ( std.Address)
            opponent: ( std.Address)
            seconds: (0 int)
            increment: (0 int)
            .res_0: (nil *gno.land/r/demo/chess.Game)
            games: (nil []*gno.land/r/demo/chess.Game)
            isBlack: (false bool)
            id: ( string)
            g: (nil *gno.land/r/demo/chess.Game)
          #5 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc0043932c0,Source:func lobbyMatch(tc tcLobby<VPBlo...,Parent:0xc003f36000)
            tc: (1 gno.land/r/demo/chess.tcLobby)
            p1: (1 int)
            p2: (0 int)
            secs: (600 int)
            incr: (5 int)
            a1: ("g1malmzy5qlfe0d35l70axscmqm6nwc3aywm26xy" std.Address)
            a2: ("g1qw75vnhcmma85qpyupdde2ecv6fu0cs45flev7" std.Address)
            game: (undefined)
            nl: (undefined)
 (static) #5 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc009094820,Source:func lobbyMatch(tc tcLobby<VPBlo...,Parent:0xc0039f6b20)
            tc: (0 gno.land/r/demo/chess.tcLobby)
            p1: (0 int)
            p2: (0 int)
            secs: (0 int)
            incr: (0 int)
            a1: ( std.Address)
            a2: ( std.Address)
            game: (nil *gno.land/r/demo/chess.Game)
            nl: (nil []gno.land/r/demo/chess.lobbyPlayer)
          #4 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc0043930e0,Source:if (const-type bool)(force<VPBlo...,Parent:0xc0043925a0)
 (static) #4 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc0090af020,Source:if (const-type bool)(force<VPBlo...,Parent:0xc00be74020)
          #3 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc0043925a0,Source:for i<VPBlock(1,0)>, player<VPBl...,Parent:0xc0043745a0)
            i: (0 int)
            player: (struct{(struct{(13924100634363035648 uint64),(1695606660000000001 int64),(%!!(MISSING)v(PANIC=String method: runtime error: invalid memory address or nil pointer dereference) *time.Location)} time.Time),(struct{(13924100730999799808 uint64),(1695606750000000001 int64),(%!!(MISSING)v(PANIC=String method: runtime error: invalid memory address or nil pointer dereference) *time.Location)} time.Time),(&0xc00cdec210.(*gno.land/r/demo/chess.Player) *gno.land/r/demo/chess.Player)} gno.land/r/demo/chess.lobbyPlayer)
            force: (true bool)
 (static) #3 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc00be74020,Source:for i<VPBlock(1,0)>, player<VPBl...,Parent:0xc009094420)
            i: (0 int)
            player: (nil gno.land/r/demo/chess.lobbyPlayer)
            force: (false <untyped> bool)
          #2 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc0043745a0,Source:func refreshLobby(tc tcLobby<VPB...,Parent:0xc003f36000)
            tc: (1 gno.land/r/demo/chess.tcLobby)
            callerAddr: ("g1malmzy5qlfe0d35l70axscmqm6nwc3aywm26xy" std.Address)
            now: (struct{(13924100733147283456 uint64),(1695606752000000001 int64),(&0xc006d2e808.(*time.Location) *time.Location)} time.Time)
            sublob: (slice[(struct{(ref(c00e762742cf910938141c9647849974ef56ce9d:52) time.Time),(struct{(13924100730999799808 uint64),(1695606750000000001 int64),(%!!(MISSING)v(PANIC=String method: runtime error: invalid memory address or nil pointer dereference) *time.Location)} time.Time),(&0xc00cdec210.(*gno.land/r/demo/chess.Player) *gno.land/r/demo/chess.Player)} gno.land/r/demo/chess.lobbyPlayer),(struct{(struct{(13924100733147283456 uint64),(1695606752000000001 int64),(&0xc006d2e808.(*time.Location) *time.Location)} time.Time),(struct{(13924100733147283456 uint64),(1695606752000000001 int64),(&0xc006d2e808.(*time.Location) *time.Location)} time.Time),(&0xc00ce39980.(*gno.land/r/demo/chess.Player) *gno.land/r/demo/chess.Player)} gno.land/r/demo/chess.lobbyPlayer)] []gno.land/r/demo/chess.lobbyPlayer)
            callerPos: (1 int)
            caller: (struct{(struct{(13924100733147283456 uint64),(1695606752000000001 int64),(&0xc006d2e808.(*time.Location) *time.Location)} time.Time),(struct{(13924100733147283456 uint64),(1695606752000000001 int64),(&0xc006d2e808.(*time.Location) *time.Location)} time.Time),(&0xc00ce39980.(*gno.land/r/demo/chess.Player) *gno.land/r/demo/chess.Player)} gno.land/r/demo/chess.lobbyPlayer)
            cat: (2 gno.land/r/demo/chess.Category)
            callerRating: (1675.0722613335827 float64)
            callerForce: (false bool)
 (static) #2 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc009094420,Source:func refreshLobby(tc tcLobby<VPB...,Parent:0xc0039f6b20)
            tc: (0 gno.land/r/demo/chess.tcLobby)
            callerAddr: ( std.Address)
            now: (nil time.Time)
            sublob: (nil []gno.land/r/demo/chess.lobbyPlayer)
            callerPos: (0 int)
            caller: (undefined)
            cat: (0 gno.land/r/demo/chess.Category)
            callerRating: (0 float64)
            callerForce: (false <untyped> bool)
          #1 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc003f36f00,Source:func LobbyJoin(seconds (const-ty...,Parent:0xc003f36000)
            seconds: (600 int)
            increment: (5 int)
            tc: (1 gno.land/r/demo/chess.tcLobby)
            caller: ("g1malmzy5qlfe0d35l70axscmqm6nwc3aywm26xy" std.Address)
            games: (slice[(&0xc00cdd6ae0.(*gno.land/r/demo/chess.Game) *gno.land/r/demo/chess.Game)] []*gno.land/r/demo/chess.Game)
            now: (struct{(13924100733147283456 uint64),(1695606752000000001 int64),(&0xc006d2e808.(*time.Location) *time.Location)} time.Time)
 (static) #1 Block(ID:0000000000000000000000000000000000000000:0,Addr:0xc008b2bc20,Source:func LobbyJoin(seconds (const-ty...,Parent:0xc0039f6b20)
            seconds: (0 int)
            increment: (0 int)
            tc: (undefined)
            caller: ( std.Address)
            games: (nil []*gno.land/r/demo/chess.Game)
            now: (nil time.Time)
    Frames:
          #6 [FRAME FUNC:NewBoard RECV:(undefined) (0 args) 26/11/9/10/8 LASTPKG:gno.land/r/demo/chess LASTRLM:Realm{Path:"gno.land/r/demo/chess",Time:218}#C00E762742CF910938141C9647849974EF56CE9D]
          #5 [FRAME FUNC:NewPosition RECV:(undefined) (0 args) 21/9/6/9/7 LASTPKG:gno.land/r/demo/chess LASTRLM:Realm{Path:"gno.land/r/demo/chess",Time:218}#C00E762742CF910938141C9647849974EF56CE9D]
          #4 [FRAME FUNC:newGame RECV:(undefined) (4 args) 13/4/0/8/6 LASTPKG:gno.land/r/demo/chess LASTRLM:Realm{Path:"gno.land/r/demo/chess",Time:218}#C00E762742CF910938141C9647849974EF56CE9D]
          #3 [FRAME FUNC:lobbyMatch RECV:(undefined) (3 args) 10/3/0/6/5 LASTPKG:gno.land/r/demo/chess LASTRLM:Realm{Path:"gno.land/r/demo/chess",Time:218}#C00E762742CF910938141C9647849974EF56CE9D]
          #2 [FRAME LABEL:  6/2/0/4/3]
          #1 [FRAME FUNC:refreshLobby RECV:(undefined) (1 args) 4/1/0/2/2 LASTPKG:gno.land/r/demo/chess LASTRLM:Realm{Path:"gno.land/r/demo/chess",Time:218}#C00E762742CF910938141C9647849974EF56CE9D]
          #0 [FRAME FUNC:LobbyJoin RECV:(undefined) (2 args) 1/0/0/0/1 LASTPKG:main LASTRLM:Realm(nil)]
    Realm:
      gno.land/r/demo/chess
    Exceptions:
      []

Stack Trace:
    0  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/errors/errors.go:20
    1  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/gno.land/pkg/sdk/vm/keeper.go:266
    2  /usr/lib/go/src/runtime/panic.go:884
    3  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/gnovm/pkg/gnolang/store.go:252
    4  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/gnovm/pkg/gnolang/values.go:2479
    5  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/gnovm/pkg/gnolang/values.go:2292
    6  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/gnovm/pkg/gnolang/values.go:2322
    7  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/gnovm/pkg/gnolang/op_eval.go:39
    8  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/gnovm/pkg/gnolang/machine.go:1272
    9  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/gnovm/pkg/gnolang/machine.go:735
   10  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/gno.land/pkg/sdk/vm/keeper.go:272
   11  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/gno.land/pkg/sdk/vm/handler.go:64
   12  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/gno.land/pkg/sdk/vm/handler.go:29
   13  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/sdk/baseapp.go:644
   14  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/sdk/baseapp.go:823
   15  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/sdk/baseapp.go:580
   16  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/bft/abci/client/local_client.go:82
   17  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/bft/proxy/app_conn.go:73
   18  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/bft/state/execution.go:253
   19  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/bft/state/execution.go:102
   20  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/bft/consensus/state.go:1347
   21  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/bft/consensus/state.go:1275
   22  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/bft/consensus/state.go:1221
   23  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/bft/consensus/state.go:1252
   24  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/bft/consensus/state.go:1637
   25  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/bft/consensus/state.go:1483
   26  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/bft/consensus/state.go:691
   27  /home/howl/go/pkg/mod/github.com/gnolang/gno@v0.0.0-20230922075615-67b75bafbe3c/tm2/pkg/bft/consensus/state.go:650
   28  /usr/lib/go/src/runtime/asm_amd64.s:1598
--= /Error =--
,events:[]'

Since the GnoVM state seems to point to the execution of NewBoard, it seems to me there's a problem resolving defaultBoard, which might get deleted at some point in previous executions of the realm?

I'm going to make a PR to make it create a new value of Board, instead of attempting to re-use Board.

thehowl commented 9 months ago

testdir.tar.gz

culprit testdir

thehowl commented 9 months ago

Found a way to consistently reproduce:

https://github.com/gnolang/gnochess/assets/4681308/3c963b38-8e54-4acc-ada3-1a8c85984224

Steps:

  1. Make P1 and P2 join the lobby. Start a new game.
  2. Play for a while. P1 resigns.
  3. Make P1 and P2 join the lobby, again.
  4. P2 gets the panic.

As I suspected, this is because we're reusing defaultBoard as a value.

PR fixing this incoming.