Symptoms

The wamd process can core under heavy pdf linearization or image optimization load if disk or RAM resources abruptly become low.

Impact

wamd cores and restarts

Conditions

If a disk or ram shortfall occurs abruptly and OWS is slow enough in responding, WAM may initially decide it has enough disk and ram to optimize but discover later it does not. This is mostly handled properly but there was one unlikely corner case which was not.

Workaround

If the shortfall is disk, free more space in /shared. If the shortfall is RAM, increasing RAM may help slightly.

Fix Information

When RAM or disk space becomes low abruptly while under heavy image optimization or pdf linearization load, wamd will no longer core.

Behavior Change