nntp: regexp always consumes rbuf if "\n" exists

We don't want to get hung into a state where we see "\n" via
index(), yet cannot consume rbuf in the while loop.  So tweak
the regexp to ensure we always consume rbuf.

I suspect this is what causes occasional 100% CPU usage of
-nntpd, but reproducing it's been difficult..

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 41f1e9c1..c0496852 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -995,7 +995,7 @@ sub event_step {
                 my $off = bytes::length($$rbuf);
                 $r = $self->do_read($rbuf, LINE_MAX, $off) or return;
         }
-        while ($r > 0 && $$rbuf =~ s/\A[ \t\r\n]*([^\r\n]*)\r?\n//) {
+        while ($r > 0 && $$rbuf =~ s/\A[ \t]*([^\n]*?)\r?\n//) {
                 my $line = $1;
                 return $self->close if $line =~ /[[:cntrl:]]/s;
                 my $t0 = now();