To continue with the simple and obvious suggestions (that you may have already tried), add "-vv" to your memcached command line. (I was also suspicious of your "-u root" as hsinclai highlighted but it'd also be interesting to learn of the mechanics of the failure.)
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The problem lay in the FilterHandler's invocation of other classes.
The code looked a little like this
$html =~ s/<\?KEYWORD\s+([^\?^>]+)\??>/$self->handle($1)/gme;
Changing this to
$html =~ s/<\?KEYWORD\s+([^\?^>]+)\??>/$self->handle($1)/ge;
# Removed multiline option 'm'
fixed the memcache problem.
It seems to alter memcache's behaviour in GetParser when checking $self->[BUF]
if ($self->[BUF] =~ /^END\r\n/) {
$self->[ON_ITEM] = undef;
return 1; # we're done successfully, return 1 to finish
}
Looks like m fighting with S*
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To be honest, that makes no sense. /m only impacts the meaning of ^ and the only '^'s in the regex you show are inside a character class and so aren't impacted by /m.
If this change fixed the mod_perl client, then it does remind me of mod_perl bugs I've seen before. Usually these bugs are heisenbugs, however, coming and going depending on how long a given Apache process has been running, though I guess I have seen some persistent ones (and rarely ones that persisted until the master Apache process was restarted).
In any case, bug(s) I've seen cause rather weird regex behavior. For example, /\d\d/g will sometimes fail on a string full of pairs of digits (and you'll see a node temporarily tagged as being written "never"). Or I've had several complex regexes that mod_perl refused to parse even though they were correct and worked outside of mod_perl. Changing to a different delimiter was the most common solution.
Although I don't understand your explanation of the workings of this bug, it certainly looks like a Perl bug if dropping /m does what you describe (note that Perl bugs are more likely to be visible in mod_perl because the Perl interpretter runs for so long). It sounds like perhaps the /m on the one regex is, in mod_perl, making the /^END\r\n/ behave as if it had a /m on it.
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Sir, I don't know where is the FilterHandler file is.
Could please tell me?
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