我也碰到这个问题了，以下是崩溃栈信息： ``` fatal error: concurrent map writes fatal error: concurrent map writes goroutine 60 [running]: runtime.throw(0xede3e2, 0x15) c:/go/src/runtime/panic.go:774 +0x79 fp=0xc000422c58 sp=0xc000422c28 pc=0x434189 runtime.mapassign_faststr(0xddcc80, 0xc0003ea420, 0xece0ae, 0x1, 0xc0002b4b38) c:/go/src/runtime/map_faststr.go:291 +0x405 fp=0xc000422cc0 sp=0xc000422c58 pc=0x415515 github.com/casbin/casbin/v2.(*Enforcer).enforce(0xc0003c7ce0, 0x0, 0x0, 0xc0003de270, 0x3, 0x3, 0xd, 0x0, 0x1) <~>/Go//pkg/mod/github.com/casbin/casbin/v2@v2.1.0/enforcer.go:343 +0x1b2 fp=0xc000423020 sp=0xc000422cc0 pc=0x8d2142 github.com/casbin/casbin/v2.(*Enforcer).Enforce(...) <~>/Go//pkg/mod/github.com/casbin/casbin/v2@v2.1.0/enforcer.go:486 github.com/casbin/casbin/v2.(*SyncedEnforcer).Enforce(0xc0003e5da0, 0xc0003de270, 0x3, 0x3, 0xc0003bee00, 0x0, 0x0) <~>/Go//pkg/mod/github.com/casbin/casbin/v2@v2.1.0/enforcer_synced.go:111 +0xd7 fp=0xc0004230b0 sp=0xc000423020 pc=0x8d4817 go-mybase/internal/app/middleware.CasbinMiddleware.func1(0xc0003ce370) /internal/app/middleware/mw_casbin.go:26 +0x1ea fp=0xc000423138 sp=0xc0004230b0 pc=0xbe938a github.com/gin-gonic/gin.(*Context).Next(0xc0003ce370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 +0x42 fp=0xc000423158 sp=0xc000423138 pc=0xbcbff2 go-mybase/internal/app/middleware.UserAuthMiddleware.func1(0xc0003ce370) /internal/app/middleware/mw_auth.go:27 +0x561 fp=0xc000423630 sp=0xc000423158 pc=0xbe9131 github.com/gin-gonic/gin.(*Context).Next(0xc0003ce370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 +0x42 fp=0xc000423650 sp=0xc000423630 pc=0xbcbff2 github.com/gin-contrib/gzip.Gzip.func2(0xc0003ce370) <~>/Go//pkg/mod/github.com/gin-contrib/gzip@v0.0.1/gzip.go:47 +0x24e fp=0xc000423720 sp=0xc000423650 pc=0xbdf1be github.com/gin-gonic/gin.(*Context).Next(0xc0003ce370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 +0x42 fp=0xc000423740 sp=0xc000423720 pc=0xbcbff2 go-mybase/internal/app/middleware.RecoveryMiddleware.func1(0xc0003ce370) /internal/app/middleware/mw_recover.go:32 +0x62 fp=0xc000423790 sp=0xc000423740 pc=0xbeadc2 github.com/gin-gonic/gin.(*Context).Next(0xc0003ce370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 +0x42 fp=0xc0004237b0 sp=0xc000423790 pc=0xbcbff2 go-mybase/internal/app/middleware.LoggerMiddleware.func1(0xc0003ce370) /internal/app/middleware/mw_logger.go:53 +0x630 fp=0xc000423a78 sp=0xc0004237b0 pc=0xbe9b10 github.com/gin-gonic/gin.(*Context).Next(0xc0003ce370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 +0x42 fp=0xc000423a98 sp=0xc000423a78 pc=0xbcbff2 go-mybase/internal/app/middleware.TraceMiddleware.func1(0xc0003ce370) /internal/app/middleware/mw_trace.go:23 +0x11f fp=0xc000423ad8 sp=0xc000423a98 pc=0xbeaf0f github.com/gin-gonic/gin.(*Context).Next(0xc0003ce370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 +0x42 fp=0xc000423af8 sp=0xc000423ad8 pc=0xbcbff2 github.com/gin-gonic/gin.(*Engine).handleHTTPRequest(0xc000144000, 0xc0003ce370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/gin.go:389 +0x5b9 fp=0xc000423be0 sp=0xc000423af8 pc=0xbd59e9github.com/gin-gonic/gin.(*Engine).ServeHTTP(0xc000144000, 0x10087c0, 0xc000150700, 0xc00013e100) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/gin.go:351 +0x13b fp=0xc000423c18 sp=0xc000423be0 pc=0xbd520bnet/http.serverHandler.ServeHTTP(0xc00017a000, 0x10087c0, 0xc000150700, 0xc00013e100) c:/go/src/net/http/server.go:2802 +0xab fp=0xc000423c48 sp=0xc000423c18 pc=0x6e02db net/http.(*conn).serve(0xc0001600a0, 0x100ab00, 0xc0001301c0) c:/go/src/net/http/server.go:1890 +0x87c fp=0xc000423fc8 sp=0xc000423c48 pc=0x6dbaac runtime.goexit() c:/go/src/runtime/asm_amd64.s:1357 +0x1 fp=0xc000423fd0 sp=0xc000423fc8 pc=0x462e91 created by net/http.(*Server).Serve c:/go/src/net/http/server.go:2927 +0x395 goroutine 1 [chan receive, 876 minutes]: main.main() /cmd/server/main.go:64 +0x440 goroutine 6 [syscall, 876 minutes]: os/signal.signal_recv(0x0) c:/go/src/runtime/sigqueue.go:147 +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 34 [runnable]: github.com/tidwall/buntdb.(*DB).backgroundManager(0xc000334000) <~>/Go//pkg/mod/github.com/tidwall/buntdb@v1.1.0/buntdb.go:548 +0xdb created by github.com/tidwall/buntdb.Open <~>/Go//pkg/mod/github.com/tidwall/buntdb@v1.1.0/buntdb.go:171 +0x2c4 goroutine 35 [select, 876 minutes]: database/sql.(*DB).connectionOpener(0xc0002fa0c0, 0x100ab00, 0xc0002ace80) c:/go/src/database/sql/sql.go:1052 +0xef created by database/sql.OpenDB c:/go/src/database/sql/sql.go:722 +0x164 goroutine 36 [select, 876 minutes]: database/sql.(*DB).connectionResetter(0xc0002fa0c0, 0x100ab00, 0xc0002ace80) c:/go/src/database/sql/sql.go:1065 +0x102 created by database/sql.OpenDB c:/go/src/database/sql/sql.go:723 +0x19a goroutine 42 [IO wait]: internal/poll.runtime_pollWait(0x1d90ee8, 0x72, 0xff8fc0) c:/go/src/runtime/netpoll.go:184 +0x5c internal/poll.(*pollDesc).wait(0xc0001dc1c8, 0x72, 0xcaf500, 0x0, 0x0) c:/go/src/internal/poll/fd_poll_runtime.go:87 +0x4c internal/poll.(*ioSrv).ExecIO(0x15cb698, 0xc0001dc018, 0xc0003304c0, 0x1, 0x0, 0x248) c:/go/src/internal/poll/fd_windows.go:228 +0x121 internal/poll.(*FD).acceptOne(0xc0001dc000, 0x248, 0xc00009e000, 0x2, 0x2, 0xc0001dc018, 0xc, 0x0, 0x0, 0xc00022dca4) c:/go/src/internal/poll/fd_windows.go:896 +0xa9 internal/poll.(*FD).Accept(0xc0001dc000, 0xc00022dcb8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...) c:/go/src/internal/poll/fd_windows.go:930 +0x17a net.(*netFD).accept(0xc0001dc000, 0xc00022dd50, 0x6e12ab, 0xc00017a0a0) c:/go/src/net/fd_windows.go:193 +0x7b net.(*TCPListener).accept(0xc00011a620, 0x6e1255, 0x0, 0x499a6d) c:/go/src/net/tcpsock_posix.go:139 +0x39 net.(*TCPListener).Accept(0xc00011a620, 0xc00022dda0, 0x18, 0xc00033a300, 0x6e07b5) c:/go/src/net/tcpsock.go:261 +0x4e net/http.(*Server).Serve(0xc00017a000, 0x1008540, 0xc00011a620, 0x0, 0x0) c:/go/src/net/http/server.go:2896 +0x28d net/http.(*Server).ListenAndServe(0xc00017a000, 0xc00029e9f0, 0xef2a4a) c:/go/src/net/http/server.go:2825 +0xbe go-mybase/internal/app.InitHTTPServer.func1(0x100abc0, 0xc00029e9f0, 0xc00011f380, 0xf, 0xc00017a000) /internal/app/web.go:78 +0xbb created by go-mybase/internal/app.InitHTTPServer /internal/app/web.go:76 +0x209 goroutine 56 [select, 1 minutes]: database/sql.(*DB).connectionCleaner(0xc0002fa0c0, 0x68c61714000) c:/go/src/database/sql/sql.go:950 +0x377 created by database/sql.(*DB).startCleanerLocked c:/go/src/database/sql/sql.go:937 +0xae goroutine 12 [running]: goroutine running on other thread; stack unavailable created by net/http.(*Server).Serve c:/go/src/net/http/server.go:2927 +0x395 goroutine 22 [chan receive]: github.com/LyricTian/captcha/store.(*memoryStore).gc(0xc000131040) <~>/Go//pkg/mod/github.com/!lyric!tian/captcha@v0.0.0-20190614104510-11aff818cbf4/store/memory.go:39 +0x214 created by github.com/LyricTian/captcha/store.NewMemoryStore <~>/Go//pkg/mod/github.com/!lyric!tian/captcha@v0.0.0-20190614104510-11aff818cbf4/store/memory.go:18 +0xe8 goroutine 13 [IO wait]: internal/poll.runtime_pollWait(0x1d90d48, 0x72, 0xff8fc0) c:/go/src/runtime/netpoll.go:184 +0x5c internal/poll.(*pollDesc).wait(0xc0001af0c8, 0x72, 0xcaf500, 0x0, 0x0) c:/go/src/internal/poll/fd_poll_runtime.go:87 +0x4c internal/poll.(*ioSrv).ExecIO(0x15cb698, 0xc0001aef18, 0xf07350, 0xfddb60, 0x1869200, 0x4) c:/go/src/internal/poll/fd_windows.go:228 +0x121 internal/poll.(*FD).Read(0xc0001aef00, 0xc0003a6ac1, 0x1, 0x1, 0x0, 0x0, 0x0) c:/go/src/internal/poll/fd_windows.go:527 +0x31c net.(*netFD).Read(0xc0001aef00, 0xc0003a6ac1, 0x1, 0x1, 0xc0002acd58, 0xc000343f68, 0x471e03) c:/go/src/net/fd_windows.go:152 +0x56 net.(*conn).Read(0xc000006368, 0xc0003a6ac1, 0x1, 0x1, 0x0, 0x0, 0x0) c:/go/src/net/net.go:184 +0x6f net/http.(*connReader).backgroundRead(0xc0003a6ab0) c:/go/src/net/http/server.go:677 +0x5f created by net/http.(*connReader).startBackgroundRead c:/go/src/net/http/server.go:673 +0xdb goroutine 61 [IO wait]: internal/poll.runtime_pollWait(0x1d90e18, 0x72, 0xff8fc0) c:/go/src/runtime/netpoll.go:184 +0x5c internal/poll.(*pollDesc).wait(0xc000171ac8, 0x72, 0xcaf500, 0x0, 0x0) c:/go/src/internal/poll/fd_poll_runtime.go:87 +0x4c internal/poll.(*ioSrv).ExecIO(0x15cb698, 0xc000171918, 0xf07350, 0x101000000000000, 0x10101, 0x0) c:/go/src/internal/poll/fd_windows.go:228 +0x121 internal/poll.(*FD).Read(0xc000171900, 0xc000378251, 0x1, 0x1, 0x0, 0x0, 0x0) c:/go/src/internal/poll/fd_windows.go:527 +0x31c net.(*netFD).Read(0xc000171900, 0xc000378251, 0x1, 0x1, 0x10000010000, 0x0, 0x0) c:/go/src/net/fd_windows.go:152 +0x56 net.(*conn).Read(0xc000118018, 0xc000378251, 0x1, 0x1, 0x0, 0x0, 0x0) c:/go/src/net/net.go:184 +0x6f net/http.(*connReader).backgroundRead(0xc000378240) c:/go/src/net/http/server.go:677 +0x5f created by net/http.(*connReader).startBackgroundRead c:/go/src/net/http/server.go:673 +0xdb goroutine 12 [running]: runtime.throw(0xede3e2, 0x15) c:/go/src/runtime/panic.go:774 +0x79 fp=0xc000304c58 sp=0xc000304c28 pc=0x434189 runtime.mapassign_faststr(0xddcc80, 0xc0003ea420, 0xece0ae, 0x1, 0xc0002b4b38) c:/go/src/runtime/map_faststr.go:291 +0x405 fp=0xc000304cc0 sp=0xc000304c58 pc=0x415515 github.com/casbin/casbin/v2.(*Enforcer).enforce(0xc0003c7ce0, 0x0, 0x0, 0xc0003a6fc0, 0x3, 0x3, 0x12, 0x0, 0x1) <~>/Go//pkg/mod/github.com/casbin/casbin/v2@v2.1.0/enforcer.go:343 +0x1b2 fp=0xc000305020 sp=0xc000304cc0 pc=0x8d2142 github.com/casbin/casbin/v2.(*Enforcer).Enforce(...) <~>/Go//pkg/mod/github.com/casbin/casbin/v2@v2.1.0/enforcer.go:486 github.com/casbin/casbin/v2.(*SyncedEnforcer).Enforce(0xc0003e5da0, 0xc0003a6fc0, 0x3, 0x3, 0xc000154300, 0x0, 0x0) <~>/Go//pkg/mod/github.com/casbin/casbin/v2@v2.1.0/enforcer_synced.go:111 +0xd7 fp=0xc0003050b0 sp=0xc000305020 pc=0x8d4817 go-mybase/internal/app/middleware.CasbinMiddleware.func1(0xc0000ba370) /internal/app/middleware/mw_casbin.go:26 +0x1ea fp=0xc000305138 sp=0xc0003050b0 pc=0xbe938a github.com/gin-gonic/gin.(*Context).Next(0xc0000ba370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 +0x42 fp=0xc000305158 sp=0xc000305138 pc=0xbcbff2 go-mybase/internal/app/middleware.UserAuthMiddleware.func1(0xc0000ba370) /internal/app/middleware/mw_auth.go:27 +0x561 fp=0xc000305630 sp=0xc000305158 pc=0xbe9131 github.com/gin-gonic/gin.(*Context).Next(0xc0000ba370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 +0x42 fp=0xc000305650 sp=0xc000305630 pc=0xbcbff2 github.com/gin-contrib/gzip.Gzip.func2(0xc0000ba370) <~>/Go//pkg/mod/github.com/gin-contrib/gzip@v0.0.1/gzip.go:47 +0x24e fp=0xc000305720 sp=0xc000305650 pc=0xbdf1be github.com/gin-gonic/gin.(*Context).Next(0xc0000ba370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 +0x42 fp=0xc000305740 sp=0xc000305720 pc=0xbcbff2 go-mybase/internal/app/middleware.RecoveryMiddleware.func1(0xc0000ba370) /internal/app/middleware/mw_recover.go:32 +0x62 fp=0xc000305790 sp=0xc000305740 pc=0xbeadc2 github.com/gin-gonic/gin.(*Context).Next(0xc0000ba370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 +0x42 fp=0xc0003057b0 sp=0xc000305790 pc=0xbcbff2 go-mybase/internal/app/middleware.LoggerMiddleware.func1(0xc0000ba370) /internal/app/middleware/mw_logger.go:53 +0x630 fp=0xc000305a78 sp=0xc0003057b0 pc=0xbe9b10 github.com/gin-gonic/gin.(*Context).Next(0xc0000ba370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 +0x42 fp=0xc000305a98 sp=0xc000305a78 pc=0xbcbff2 go-mybase/internal/app/middleware.TraceMiddleware.func1(0xc0000ba370) /internal/app/middleware/mw_trace.go:23 +0x11f fp=0xc000305ad8 sp=0xc000305a98 pc=0xbeaf0f github.com/gin-gonic/gin.(*Context).Next(0xc0000ba370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 +0x42 fp=0xc000305af8 sp=0xc000305ad8 pc=0xbcbff2 github.com/gin-gonic/gin.(*Engine).handleHTTPRequest(0xc000144000, 0xc0000ba370) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/gin.go:389 +0x5b9 fp=0xc000305be0 sp=0xc000305af8 pc=0xbd59e9github.com/gin-gonic/gin.(*Engine).ServeHTTP(0xc000144000, 0x10087c0, 0xc00017a0e0, 0xc0002ae200) <~>/Go//pkg/mod/github.com/gin-gonic/gin@v1.4.0/gin.go:351 +0x13b fp=0xc000305c18 sp=0xc000305be0 pc=0xbd520bnet/http.serverHandler.ServeHTTP(0xc00017a000, 0x10087c0, 0xc00017a0e0, 0xc0002ae200) c:/go/src/net/http/server.go:2802 +0xab fp=0xc000305c48 sp=0xc000305c18 pc=0x6e02db net/http.(*conn).serve(0xc00016a140, 0x100ab00, 0xc0001e8240) c:/go/src/net/http/server.go:1890 +0x87c fp=0xc000305fc8 sp=0xc000305c48 pc=0x6dbaac runtime.goexit() c:/go/src/runtime/asm_amd64.s:1357 +0x1 fp=0xc000305fd0 sp=0xc000305fc8 pc=0x462e91 created by net/http.(*Server).Serve c:/go/src/net/http/server.go:2927 +0x395 exit status 2 ```

fatal error: concurrent map writes 崩溃 #51

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