Bug#864782: perl: Regexp matching crashes claiming string is malformed Utf8, despite it is valid.

[gregor herrmann]

On Wed, 14 Jun 2017 19:16:35 +0200, Benjamin Bayart wrote:

> In some cases, some valid utf-8 chinese (or japanese Kanji) chars
> in a perl string makes perl die on "Malformed UTF-8" while matching
> a regexp.
> 
> Here is the smallest programm (all in ascii, for safety) creating
> the problem.

Now that's interesting. I ran the script in a loop on my laptop
(amd64, Debian unstable), and it didn't error out a single time in
over 100_000 runs.

OTOH, on one of my raspis (armhf-ish, Raspbian stretch), it didn't
even succeed a single time in a couple of tries, and always fails
with

Failed Malformed UTF-8 character (fatal) at crash.pl line 8.

And on a third machine, a remote server (amd64, Debian stretch), I
got the first pass only after over 400 failures.

All with perl 5.24.1-3. 

So whatever is going on here seems a bit undeterministic …

Cheers,
gregor

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