Crash from log?

I have a program and this program stops. I don’t understand this crash. Here is the error message:

goroutine 90 [running]:
runtime.throw(0xdf7680, 0x21)
/root/go/src/runtime/panic.go:547 +0x90 fp=0xc8216195a8 sp=0xc821619590
runtime.mapaccess2(0xb30b40, 0xc8202f8ab0, 0xc820d24318, 0x1, 0x1)
/root/go/src/runtime/hashmap.go:343 +0x5a fp=0xc8216195f0 sp=0xc8216195a8
reflect.mapaccess(0xb30b40, 0xc8202f8ab0, 0xc820d24318, 0xc8202f8ab0)
/root/go/src/runtime/hashmap.go:993 +0x35 fp=0xc821619620 sp=0xc8216195f0
reflect.Value.MapIndex(0xb30b40, 0xc8202f4cd8, 0x1b5, 0xb2fc40, 0xc820d24318, 0xa6, 0x0, 0x0, 0x0)
/root/go/src/reflect/value.go:1041 +0x14a fp=0xc8216196a8 sp=0xc821619620
fmt.(*pp).printReflectValue(0xc821caf5f0, 0xb30b40, 0xc8202f4cd8, 0x1b5, 0xc800000076, 0x2, 0x0)
/root/go/src/fmt/print.go:904 +0x2887 fp=0xc821619e60 sp=0xc8216196a8
fmt.(*pp).printValue(0xc821caf5f0, 0xb30b40, 0xc8202f4cd8, 0x1b5, 0x76, 0x2, 0x1b5)
/root/go/src/fmt/print.go:848 +0x440 fp=0xc821619f50 sp=0xc821619e60
fmt.(*pp).printReflectValue(0xc821caf5f0, 0xcce0a0, 0xc8202f4cd0, 0x199, 0xc800000076, 0x1, 0x0)
/root/go/src/fmt/print.go:932 +0x3b79 fp=0xc82161a708 sp=0xc821619f50
fmt.(*pp).printValue(0xc821caf5f0, 0xcce0a0, 0xc8202f4cd0, 0x199, 0xc800000076, 0x1, 0x0)
/root/go/src/fmt/print.go:848 +0x440 fp=0xc82161a7f8 sp=0xc82161a708
fmt.(*pp).printReflectValue(0xc821caf5f0, 0xced300, 0xc8202f4cd0, 0x16, 0x76, 0x0, 0x2e05c59cf6c70800)
/root/go/src/fmt/print.go:1009 +0x351e fp=0xc82161afb0 sp=0xc82161a7f8
fmt.(*pp).printArg(0xc821caf5f0, 0xced300, 0xc8202f4cd0, 0x76, 0x0, 0xc81ff96d00)
/root/go/src/fmt/print.go:810 +0x540 fp=0xc82161b138 sp=0xc82161afb0
fmt.(*pp).doPrint(0xc821caf5f0, 0xc82161bad0, 0x3, 0x3, 0x101)
/root/go/src/fmt/print.go:1273 +0x24d fp=0xc82161b238 sp=0xc82161b138
fmt.Sprintln(0xc82161bad0, 0x3, 0x3, 0x0, 0x0)
/root/go/src/fmt/print.go:271 +0x62 fp=0xc82161b288 sp=0xc82161b238
log.Println(0xc82161bad0, 0x3, 0x3)
/root/go/src/log/log.go:295 +0x35 fp=0xc82161b2d0 sp=0xc82161b288
main.(*EnvoieMsg).TraiteEnvoieMsg(0xc820100000, 0xc8203bf080)
/root/workspace/go/src/client/envoieMsg.go:781 +0x48aa fp=0xc82161bf70 sp=0xc82161b2d0
/root/go/src/runtime/asm_amd64.s:1998 +0x1 fp=0xc82161bf78 sp=0xc82161bf70
created by main.(*EnvoieMsg).EnvoieMsg
/root/workspace/go/src/client/envoieMsg.go:406 +0x46b

goroutine 1 [chan receive, 909 minutes]:
/root/workspace/go/src/client/client.go:512 +0x4898

goroutine 17 [syscall, 909 minutes, locked to thread]:
/root/go/src/runtime/asm_amd64.s:1998 +0x1

goroutine 5 [syscall, 909 minutes]:
/root/go/src/runtime/sigqueue.go:116 +0x132

Line blocking:
log.Println(“EnvoieMsg: Fin de envoieMsg==>”,this.variable, typeMsg)

The function is a goroutine and can call many time and this.variable is variable use on readonly in all goroutine.

It is a problem this.variable ?
I have to put a mutex to use the log.Println ?

thanks for response :slight_smile:

I can corrected my message :
502 Bad Gateway

The forum don"t work ???

What are the types of this.variable and of typeMsg? (Especially, is one of them a complex data structure, like a struct with slices, arrays, or pointers?)

And have you already run the race detector? You say that all goroutines access the variables only for reading, but still…

Yes this.variable is a pointeur of structure.
I make just log.println. I think that the println print all variables on structure and this variable can change.
I wanted a confirmation that it is.
I delete this.variable form log.println() because I do not need it and I’m retesting.

Thanks you, I knew all along.

Good approach. If log.Println then does not error out anymore then Println seems to have some problem while trying to examine the structure of this.variable.

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