I encountered this error in my Triton instance
And the community at irc.freenode.org #smartos helped me solve it.
The error was related to running out of space and my dump device was not big enough,
so here are the steps to solve it:
- Add a new disk to your Triton instance and boot it using a SmartOS usb and select rescue mode then execute:
# zpool import zones
# zfs destroy zones/dump
# zfs create -V <your ram amount>G zones/dump
# dumpadm -y -d /dev/zvol/dsk/zones/dump
# reboot
Relevant information on how to fix this, is in this irc conversation :