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mmap(PROT_NONE) failed

hello everyone, my demo4.cr is:

require "gzip"

class ReadsMapPositionStat
  def initialize()
	output_content = "AB" * 1000
	output_stat = File.new("./demo4.pos.stat.gz", "w")
	fasta = {} of String => Int32
	num = 22254436
	while num > 0
		fasta["OJEBLLGB_00006.#{num}"] = 1000
		num -=1
	end

	l = 60953398
	while l > 0
		write_to_gzip(output_stat, output_content)
		l -=1
	end
	output_stat.close
	puts "end at #{Time.new}"

  end

  def write_to_gzip(outgzip : IO, content : String)
	Gzip::Writer.open(outgzip) do |gzip|
		gzip.puts(content)
	end
  end

end

ReadsMapPositionStat.new()

after build crystal build demo4.cr --release ,then run that code, get error:
mmap(PROT_NONE) failed

$crystal --version
Crystal 0.32.1 [41bd18fbe] (2019-12-18)

LLVM: 8.0.0
Default target: x86_64-unknown-linux-gnu
$cat /etc/centos-release
CentOS Linux release 7.6.1810 (Core) 

but if change to:

require "gzip"

class ReadsMapPositionStat
  def initialize()
	output_content = "AB" * 1000
	output_stat = File.new("./demo4.pos.stat.gz", "w")

	fasta = {} of String => Int32
	num = 22254436
	while num > 0
		fasta["OJEBLLGB_00006.#{num}"] = 1000
		num -=1
	end

	Gzip::Writer.open(output_stat) do |gzip|
		l =  60953398
		while l > 0
			gzip.puts(output_content)
			l -=1
		end
	end

	output_stat.close
  end
end

ReadsMapPositionStat.new()

will get no error~

@straight-shoota thanks for the help~