Date: Sun, 27 Nov 2022 20:24:56 -0800 From: Mel Pilgrim <list_freebsd@bluerosetech.com> To: freebsd-questions@freebsd.org Subject: kernel panic due to missing root when using boot environments Message-ID: <1c68d4e1-38ff-b820-f59e-a14fe3df0675@bluerosetech.com>
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I have a system running 12.3p6 with a GELI+ZFS root configuration that had a kernel panic on reboot because it wasn't mounting root correctly. The system has two pools involved in booting: bootkey: contains the UEFI partition, /boot, and the GELI keys for the devices under the nvme pool nvme: contains everything else Previously, the system set vfs.root.mountfrom in loader.conf. Then I reconfigured to use boot environments: # zfs get -s local all nvme/ROOT/freebsd12 NAME PROPERTY VALUE SOURCE nvme/ROOT/freebsd12 mountpoint / local nvme/ROOT/freebsd12 readonly off local nvme/ROOT/freebsd12 canmount noauto local # zpool get bootfs NAME PROPERTY VALUE SOURCE bootkey bootfs - default nvme bootfs nvme/ROOT/freebsd12 local With these settings, the kernel panics and reboots before it launches userland. I can't grab a log of the panic, but fast eyeballs caught: panic: no init Reboot again, set vfs.root.mountfrom manually from the loader prompt, and it boots fine. Thus a few queries: 1: In a configuration where the boot pool and root pool are not the same, how do I set bootfs? The obvious options of setting it the same on both pools or at least the boot pool won't work: # zpool set bootfs=nvme/ROOT/freebsd12 bootkey cannot set property for 'bootkey': 'nvme/ROOT/freebsd12' is an invalid name 1a: Why is the setting format bootfs=pool/dataset if I can't specify a different pool than the one on which I'm setting bootfs? 2. Why did the kernel panic instead of dropping to the mountroot prompt? Is it because the kernel assumed the filesystem containing /boot was / in absence of vfs.root.mountfrom and bootfs so there was no attempt to mount / to fail into the mountroot prompt?
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