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encoding/xml: SEGFAULT: xml.Escape(*bytes.Buffer,... #3991

gopherbot opened this Issue Aug 22, 2012 · 1 comment


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gopherbot commented Aug 22, 2012

by mux2005:

What steps will reproduce the problem?
If possible, include a link to a program on


package main

import (
func main() {  
  var buffy *bytes.Buffer
  xml.Escape(buffy, []byte("foo"))

2. Save as test.go

3. go run test.go

What is the expected output?

An intelligible error message informing me that my variable is uninitialized

What do you see instead?

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x58 pc=0x415fa8]

goroutine 1 [running]:
bytes.(*Buffer).Write(0x0, 0xf84005b000, 0x300000003, 0x200000000, 0x0, ...)
    go/src/pkg/bytes/buffer.go:107 +0x30
encoding/xml.Escape(0xf840024570, 0x0, 0xf84005b000, 0x300000003, 0x0, ...)
    go/src/pkg/encoding/xml/xml.go:1673 +0x1a9
    /tmpfs/gosandbox-1ed22190_28b8d3ce_26e32609_9c0c9a0b_60e64093/prog.go:10 +0xa1
Which compiler are you using (5g, 6g, 8g, gccgo)?

Which operating system are you using?

Which version are you using?  (run 'go version')

Please provide any additional information below.

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robpike commented Aug 22, 2012

Comment 1:

Your uninitialized variable is a nil pointer, as the first line of the trace tells you.

Status changed to WorkingAsIntended.

@mikioh mikioh changed the title SEGFAULT: xml.Escape(*bytes.Buffer,... encoding/xml: SEGFAULT: xml.Escape(*bytes.Buffer,... Jan 9, 2015

@golang golang locked and limited conversation to collaborators Jun 24, 2016

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