net/textproto: ReadLineBytes() returns strange []byte

[Chipsterjulien]

What version of Go are you using (go version)?

1.10.1

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

linux on x86 (64 bits). Testing same code on android and it's ok

What did you do?

with 1.9.4, it works

With my bot on irc, sometimes, it reads some things with the code as follow:

reader := bufio.NewReader(bot.conn)
tp := textproto.NewReader(reader)
line, err = tp.ReadLineBytes()
…

I try with tp.ReadLine() to get a string but it's the same error.

Sometimes, i have this:

ircbot[1179]: [202B blob data]
ircbot[1179]: [125B blob data]

If possible, provide a recipe for reproducing the error.
yes and no. If my friend speaks yes, it's me, no:

As i said before, my code works with go-1.9.4

11:46:03.872 event ▶ DEBU 0a2 > :nheir!~nheir@died.re PRIVMSG #archlinux-fr :ça pourrait arriver en construisant une page web avec le bon titre par exemple
panic: runtime error: slice bounds out of range
ircbot[1049]: goroutine 11 [running]:
ircbot[1049]: main.(*Bot).searchToManyHL(0xc42009e5a0, 0xc4203c6020, 0xc42004fd78, 0xc420056600)
ircbot[1049]: /home/julien/ircbot/event.go:465 +0x970
ircbot[1049]: main.event(0xc42009e5a0, 0xc4200565a0, 0xc420056600, 0xc420056660, 0xc420060120, 0xc42004fef8)
ircbot[1049]: /home/julien/ircbot/event.go:153 +0xccd
ircbot[1049]: main.eventManagement(0xc42009e5a0, 0xc4200565a0, 0xc420056600, 0xc420056660, 0xc420060120)
ircbot[1049]: /home/julien/ircbot/readWriteEventProcess.go:45 +0x1c9
ircbot[1049]: created by main.main
ircbot[1049]: /home/julien/ircbot/app.go:52 +0x2ac
systemd[1]: ircbot.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
systemd[1]: ircbot.service: Failed with result 'exit-code'.

[agnivade]

yes and no. If my friend speaks yes, it's me, no:

I'm sorry, what does that supposed to mean ?

Please post a self-contained working code which reproduces the issue.

Also, the error message that you have posted shows a panic on slice bounds out of range. But the issue you have reported is about ReadLineBytes() returning unexpected output. So which is the issue ? the panic or the unexpected output ?

Label suggestions - WaitingForInfo

[bcmills]

It's not clear to me what issue you are reporting here. The panic trace you have posted is not a panic in the standard library, and we don't know what the ircbot output lines mean.

Do you believe that (*textproto.Reader).ReadLineBytes is returning something that is not, in fact, the next line from the underlying buffer? If so, it would help if you can provide an input that triggers that behavior. (You can log an arbitrary string in quoted Go syntax using the %q format specifier.)

As i said before, my code works with go-1.9.4

The only recent changes to the textproto package in 1.10 relate to leading whitespace (#22464, CC: @tombergan).

[Chipsterjulien]

My bad, i found my big mistake. Sorry for the inconvenience