How do I debug memory related errors? panic serving [::1]:59182: runtime error: invalid memory address or nil pointer dereference

[deepak]

Hi all, 

I am new to go programming, I just wrote a http server program based on the tutorial here. The code is working fine in linux ( I am using linux mint 14 with go version 1.0.2). But when I demoed it to my friend in a mac machine with go version 1.1.2 it crashed while serving the request. My question is how do I debug these sort of errors, what tools can be used? Any articles on inspecting these sort of errors would be helpful. Also right now I have no idea how to fix this.

code is here

when running the code I am getting this error ( go version 1.1.2 mac os x 10.7.5)

2013/08/26 18:09:36 GET HTTP/1.1 /

2013/08/26 18:09:36 http: panic serving [::1]:59182: runtime error: invalid memory address or nil pointer dereference

goroutine 4 [running]:

net/http.func·007()

/usr/local/go/src/pkg/net/http/server.go:1022 +0x9c

main.handleRoute(0x18a368, 0x5, 0x11469de0, 0x11478400, 0x11475310, ...)

/Users/deepak/Work/Go/programs/server/server.go:61 +0x1c1

main.router(0x11469de0, 0x11478400, 0x11453850)

/Users/deepak/Work/Go/programs/server/server.go:69 +0x11a

net/http.HandlerFunc.ServeHTTP(0x1c80cc, 0x11469de0, 0x11478400, 0x11453850)

/usr/local/go/src/pkg/net/http/server.go:1149 +0x39

net/http.(*ServeMux).ServeHTTP(0x11469660, 0x11469de0, 0x11478400, 0x11453850)

/usr/local/go/src/pkg/net/http/server.go:1416 +0xda

net/http.serverHandler.ServeHTTP(0x1146d270, 0x11469de0, 0x11478400, 0x11453850)

/usr/local/go/src/pkg/net/http/server.go:1517 +0x11e

net/http.(*conn).serve(0x114722d0)

/usr/local/go/src/pkg/net/http/server.go:1096 +0x650

created by net/http.(*Server).Serve

/usr/local/go/src/pkg/net/http/server.go:1564 +0x23f

^[[A^[[A^Cexit status 2

Thanks

Deepak

[Kyle Lemons]

Upgrade to go 1.1.1, add debug prints for the values used in that line, and try the race tool.

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[Kyle Lemons]

whoops, 1.1.2*

[Dave Cheney]

Please ensure you handle all errors. Your program is crashing on line 61 because your program assumes that load("404") always succeeds. It is failing because you are making assumptions about the working directory your program is running from. 

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[deepak kumar]

sorry for the delay in response, I was out of station.

@Kyle could you be more specific about the race tool. 

In this code the error message didn't gave me any insight about the wrong directory path, it was saying something related to network, so I was kind of confused.

Thanks Dave, I didn't notice the path while showing it to my friend I just forgot to use /Users in mac as users directory.

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Thanks & Regards

Deepak Kumar

+91-9895821948 | skype: deepakkumarnd | twitter: @_deepak0