Hi, I have a couple of systems, installed in 2012 and updated up to illumos 2019 (will have to update to 2024 later). They periodically (every 3-4 months, sometimes earlier) create a core dump under /var/fm/fmd. Looks like fmd core dumped, so no email notice is sent, and we end up filling the rpool. I found  this link: https://support.oracle.com/knowledge/Sun%20Microsystems/1020519_1.html So here I attach the pstack of one of the dumps.   Any idea? Gabriele     Sonicle S.r.l. : http://www.sonicle.com Music: http://www.gabrielebulfon.com eXoplanets : https://gabrielebulfon.bandcamp.com/album/exoplanets