crashes in production but not development

[andrewarrow]

here is code, on the TypeByBuffer call I get the panic:

       err := magicmime.Open(magicmime.MAGIC_MIME_TYPE)
       mime, err := magicmime.TypeByBuffer(buffer)
       if err != nil {
               return err
       }
       magicmime.Close()

fatal error: unexpected signal during runtime execution
Jun 05 07:36:23 : /usr/lib/golang/src/runtime/panic.go:503 +0x8e
Jun 05 07:36:23 : runtime.sigpanic()
Jun 05 07:36:23 : /usr/lib/golang/src/runtime/sigpanic_unix.go:14 +0x5e
Jun 05 07:36:23 : goroutine 6581214 [syscall, locked to thread]:
Jun 05 07:36:23 : runtime.cgocall_errno(0x401610, 0xc2080e1698, 0xc200000000)
Jun 05 07:36:23 : /usr/lib/golang/src/runtime/cgocall.go:130 +0xf5 fp=0xc2080e16
Jun 05 07:36:23 : github.com/rakyll/magicmime._Cfunc_magic_buffer(0x7fece80008c0
Jun 05 07:36:23 : github.com/rakyll/magicmime/_obj/_cgo_gotypes.go:76 +0x44 fp=0
Jun 05 07:36:23 : github.com/rakyll/magicmime.TypeByBuffer(0xc2085fda00, 0x200,
Jun 05 07:36:23 : /home/aa/go/src/github.com/rakyll/magicmime/magicmime.go:151

[andrewarrow]

it might be something as silly as the buffer is empty? I'm not sure yet what casues it but I see it every fews days in the production logs.

[andrewarrow]

well just noticed in code:

  if len(buffer) == 0 {
    return errors.New("mime type checked failed zero bytes")
  }

so buffer len is not zero.