Since memory limits are based on counting memory pages and since memory pages are 4096 bytes, not 4000 bytes shouldn the default mem limit setting of 1 GB:
<mem limit="262144"></mem>
instead be:
<mem limit="256000"></mem>
# getconf PAGESIZE
4096
<mem limit="262144"></mem>
instead be:
<mem limit="256000"></mem>
# getconf PAGESIZE
4096
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