Reservoir increase, a bridge too far?

I'm beginning to suspect the increase in reservoir size may have increased memory pressure a bit too far.
I'm opening this as a tracker issue to collect other issues and data to determine if we need to claw back some memory for the rest of the system.

Some issues that may be related:

https://github.com/oxidecomputer/stlouis/issues/1033
https://github.com/oxidecomputer/stlouis/issues/1034 This has been integrated from upstream as oxidecomputer/illumos-gate@8d9c1e6
https://github.com/oxidecomputer/omicron/issues/10871

There are some still to be triaged kernel cores from dogfood in /staff/core/dogfood-2026-07-29-misc-cores/ as well as several userland cores to be inspected (locating forthcoming)

More possibly related issues, though these are their own unique issues, I suspect the lower free memory may have increased the chance of us seeing them:
https://github.com/oxidecomputer/omicron/issues/10980
https://github.com/oxidecomputer/omicron/issues/10981

And older issue that I believe we stumbled across:
https://www.illumos.org/issues/14131