I can't reproduce this with just the code you provide:
#!perl
$rc = syswrite $socket, pack("N",$self->{'length'}+length($SP_MAGIC)),
+ 4;
print "Ok";
prints: "Ok"
I'm not disregarding the possibility of some bug in perl, but it's likely that the bug originates somewhere else. First up, what's in $self->{length}, $socket and $SP_MAGIC?
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