Hello everyone. I had been following obarun for a while on the sidelines and finally decided to take it for a spin. Everything about this distro is great so far (congrats everyone involved!), with the one exception being a minor nuisance during boot.

In short, I get the "all-Runtime: fatal: crashed! -- Your machine is operational but some runtime service failed to start correctly" treatment every time I turn the machine on. I have to bring up the root tree manually (It only contains a custom dhcpcd service) because no other trees will start automatically after that message. But the system seems to work normally, i.e. no services in the boot tree fail to start.

I'm still learning about s6/66, and so far I've been unable to figure out why the boot tree is crashing.

Possibly relevant logs follow.
$ 66-intree -g
Name         : root
Initialized  : yes
Enabled      : no
Starts after : None
Current      : yes
Allowed      : root
Symlinks     : svc->source db->source
Contents     : /
               |-(1104,Enabled,classic) dhcpcd-custom-log
               `-(1105,Enabled,classic) dhcpcd-custom

Name         : boot
Initialized  : yes
Enabled      : yes
Starts after : None
Current      : no
Allowed      : root
Symlinks     : svc->source db->source
Contents     : /
               |-(391,Enabled,classic) tty-earlier@ tty12
               |-(up,Enabled,oneshot) system-hostname
               |-(up,Enabled,oneshot) mount-run
               |-(up,Enabled,oneshot) populate-run
               |-(up,Enabled,oneshot) mount-tmp
               |-(up,Enabled,oneshot) populate-tmp
               |-(up,Enabled,oneshot) mount-proc
               |-(up,Enabled,oneshot) mount-sys
               |-(up,Enabled,oneshot) populate-sys
               |-(up,Enabled,oneshot) mount-dev
               |-(up,Enabled,oneshot) mount-pts
               |-(up,Enabled,oneshot) mount-shm
               |-(up,Enabled,oneshot) populate-dev
               |-(up,Enabled,oneshot) mount-cgroups
               |-(up,Enabled,bundle) 00
               |-(up,Enabled,bundle) all-Mount
               |-(up,Enabled,oneshot) system-hwclock
               |-(up,Enabled,oneshot) modules-kernel
               |-(up,Enabled,oneshot) system-random
               |-(up,Enabled,oneshot) modules-system
               |-(up,Enabled,oneshot) system-sysctl
               |-(434,Enabled,longrun) udevd-log
               |-(611,Enabled,longrun) udevd
               |-(up,Enabled,oneshot) udevadm
               |-(up,Enabled,oneshot) system-fontnkey
               |-(up,Enabled,oneshot) system-fsck
               |-(up,Enabled,oneshot) mount-fstab
               |-(up,Enabled,bundle) all-System
               |-(up,Enabled,oneshot) mount-rw
               |-(up,Enabled,oneshot) mount-netfs
               |-(up,Enabled,oneshot) local-loop
               |-(up,Enabled,oneshot) local-sethostname
               |-(up,Enabled,oneshot) local-time
               |-(up,Enabled,oneshot) local-authfiles
               |-(up,Enabled,oneshot) local-tmpfiles
               |-(up,Enabled,oneshot) local-dmesg
               |-(up,Enabled,bundle) all-Local
               |-(up,Enabled,oneshot) all-Runtime
               |-(up,Enabled,bundle) All
               |-(874,Enabled,longrun) tty-rc@ tty1
               |-(873,Enabled,longrun) tty-rc@ tty2
               `-(up,Enabled,module) boot@ system
$ cat /run/66/log/0/current
2021-10-15 10:05:05.276125103  [Initiate db of tree boot...]
2021-10-15 10:05:05.276973434  66-init(src/lib66/rc_init.c: rc_init(): 121): tracing: initiate db of tree: boot ...
2021-10-15 10:05:05.289538829  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: system-hostname
2021-10-15 10:05:05.289546353  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: system-hostname
2021-10-15 10:05:05.289547996  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: mount-run
2021-10-15 10:05:05.289553026  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: mount-run
2021-10-15 10:05:05.289554449  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: populate-run
2021-10-15 10:05:05.289558827  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: populate-run
2021-10-15 10:05:05.289560119  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: mount-tmp
2021-10-15 10:05:05.289561371  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: mount-tmp
2021-10-15 10:05:05.289565499  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: populate-tmp
2021-10-15 10:05:05.289566832  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: populate-tmp
2021-10-15 10:05:05.289567994  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: mount-proc
2021-10-15 10:05:05.289571791  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: mount-proc
2021-10-15 10:05:05.289573073  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: mount-sys
2021-10-15 10:05:05.289576740  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: mount-sys
2021-10-15 10:05:05.289577993  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: populate-sys
2021-10-15 10:05:05.289581619  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: populate-sys
2021-10-15 10:05:05.289582842  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: mount-dev
2021-10-15 10:05:05.289586449  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: mount-dev
2021-10-15 10:05:05.289587631  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: mount-pts
2021-10-15 10:05:05.289591187  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: mount-pts
2021-10-15 10:05:05.289592390  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: mount-shm
2021-10-15 10:05:05.289595976  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: mount-shm
2021-10-15 10:05:05.289597219  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: populate-dev
2021-10-15 10:05:05.289600825  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: populate-dev
2021-10-15 10:05:05.289602048  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: mount-cgroups
2021-10-15 10:05:05.289605785  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: mount-cgroups
2021-10-15 10:05:05.289606937  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: 00
2021-10-15 10:05:05.289610444  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: 00
2021-10-15 10:05:05.289611696  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: system-hwclock
2021-10-15 10:05:05.289615293  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: system-hwclock
2021-10-15 10:05:05.289616515  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: modules-kernel
2021-10-15 10:05:05.289625061  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: modules-kernel
2021-10-15 10:05:05.289626273  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: system-random
2021-10-15 10:05:05.289633837  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: system-random
2021-10-15 10:05:05.289635120  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: modules-system
2021-10-15 10:05:05.289636312  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: modules-system
2021-10-15 10:05:05.289637484  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: system-sysctl
2021-10-15 10:05:05.289641642  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: system-sysctl
2021-10-15 10:05:05.289642864  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: udevd-log
2021-10-15 10:05:05.289646681  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: udevd-log
2021-10-15 10:05:05.289647814  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: udevd
2021-10-15 10:05:05.289653715  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: udevd
2021-10-15 10:05:05.289654887  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: udevadm
2021-10-15 10:05:05.289656039  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: udevadm
2021-10-15 10:05:05.289659726  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: system-fontnkey
2021-10-15 10:05:05.289661018  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: system-fontnkey
2021-10-15 10:05:05.289662150  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: all-Mount
2021-10-15 10:05:05.289665817  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: all-Mount
2021-10-15 10:05:05.289667010  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: system-fsck
2021-10-15 10:05:05.289670967  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: system-fsck
2021-10-15 10:05:05.289672159  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: mount-fstab
2021-10-15 10:05:05.289675846  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: mount-fstab
2021-10-15 10:05:05.289677028  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: all-System
2021-10-15 10:05:05.289680886  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: all-System
2021-10-15 10:05:05.289682038  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: mount-rw
2021-10-15 10:05:05.289685655  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: mount-rw
2021-10-15 10:05:05.289686887  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: local-sethostname
2021-10-15 10:05:05.289690764  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: local-sethostname
2021-10-15 10:05:05.289691956  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: mount-netfs
2021-10-15 10:05:05.289695663  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: mount-netfs
2021-10-15 10:05:05.289699220  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: local-loop
2021-10-15 10:05:05.289702847  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: local-loop
2021-10-15 10:05:05.289704029  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: local-time
2021-10-15 10:05:05.289707596  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: local-time
2021-10-15 10:05:05.289708838  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: local-authfiles
2021-10-15 10:05:05.289712455  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: local-authfiles
2021-10-15 10:05:05.289713657  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: local-tmpfiles
2021-10-15 10:05:05.289718717  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: local-tmpfiles
2021-10-15 10:05:05.289719979  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: local-dmesg
2021-10-15 10:05:05.289723646  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: local-dmesg
2021-10-15 10:05:05.289724878  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: all-Local
2021-10-15 10:05:05.289726060  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: all-Local
2021-10-15 10:05:05.289729637  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: all-Runtime
2021-10-15 10:05:05.289730899  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: all-Runtime
2021-10-15 10:05:05.289732022  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: All
2021-10-15 10:05:05.289735498  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: All
2021-10-15 10:05:05.289736670  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: tty-rc@ tty1
2021-10-15 10:05:05.289740237  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: tty-rc@ tty1
2021-10-15 10:05:05.289741409  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: tty-rc@ tty2
2021-10-15 10:05:05.289744976  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: tty-rc@ tty2
2021-10-15 10:05:05.289746188  66-init(src/lib66/rc_init.c: rc_init(): 147): tracing: Write state file of: boot@ system
2021-10-15 10:05:05.289749735  66-init(src/lib66/rc_init.c: rc_init(): 153): info: Initialized successfully: boot@ system
2021-10-15 10:05:05.290202494  [Start db services of tree boot...]
2021-10-15 10:05:05.294038037  s6-rc: info: bringing selected services up
2021-10-15 10:05:05.294329624  s6-rc: info: service s6rc-fdholder: starting
2021-10-15 10:05:05.294400968  s6-rc: info: service s6rc-oneshot-runner: starting
2021-10-15 10:05:05.297175281  s6-rc: info: service s6rc-oneshot-runner successfully started
2021-10-15 10:05:05.297392688  s6-rc: info: service system-hostname: starting
2021-10-15 10:05:05.297459484  s6-rc: info: service mount-tmp: starting
2021-10-15 10:05:05.297523313  s6-rc: info: service mount-run: starting
2021-10-15 10:05:05.297696158  s6-rc: info: service mount-proc: starting
2021-10-15 10:05:05.298178071  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.298182319  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.298218106  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.298220080  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.299798180  s6-rc: info: service s6rc-fdholder successfully started
2021-10-15 10:05:05.299864815  s6-rc: info: service udevd-log: starting
2021-10-15 10:05:05.301744400  mount-proc: info: starts...
2021-10-15 10:05:05.301843055  system-hostname: info: starts...
2021-10-15 10:05:05.301944615  mount-run: info: starts...
2021-10-15 10:05:05.302068377  mount-tmp: info: starts...
2021-10-15 10:05:05.303103769  s6-rc: info: service mount-run successfully started
2021-10-15 10:05:05.303379666  s6-rc: info: service populate-run: starting
2021-10-15 10:05:05.303396017  s6-rc: info: service mount-proc successfully started
2021-10-15 10:05:05.303465898  s6-rc: info: service mount-sys: starting
2021-10-15 10:05:05.303483942  s6-rc: info: service udevd-log successfully started
2021-10-15 10:05:05.303712250  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.303802249  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.305427447  populate-run: info: starts...
2021-10-15 10:05:05.306274245  mount-sys: info: starts...
2021-10-15 10:05:05.307219828  s6-rc: info: service system-hostname successfully started
2021-10-15 10:05:05.307229346  s6-rc: info: service mount-sys successfully started
2021-10-15 10:05:05.307332590  s6-rc: info: service populate-sys: starting
2021-10-15 10:05:05.307394135  s6-rc: info: service mount-dev: starting
2021-10-15 10:05:05.307692164  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.307749341  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.307873364  s6-rc: info: service mount-tmp successfully started
2021-10-15 10:05:05.308012505  s6-rc: info: service populate-tmp: starting
2021-10-15 10:05:05.308414048  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.309413452  populate-sys: info: starts...
2021-10-15 10:05:05.309637823  s6-rc: info: service populate-run successfully started
2021-10-15 10:05:05.310090682  mount-dev: info: starts...
2021-10-15 10:05:05.310189087  populate-tmp: info: starts...
2021-10-15 10:05:05.310903887  s6-rc: info: service mount-dev successfully started
2021-10-15 10:05:05.310981583  s6-rc: info: service populate-dev: starting
2021-10-15 10:05:05.311057556  s6-rc: info: service mount-shm: starting
2021-10-15 10:05:05.311139159  s6-rc: info: service mount-pts: starting
2021-10-15 10:05:05.311224078  s6-rc: info: service mount-cgroups: starting
2021-10-15 10:05:05.311249846  s6-rc: info: service populate-tmp successfully started
2021-10-15 10:05:05.311342169  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.311406330  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.311559377  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.311619950  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.313167072  populate-dev: info: starts...
2021-10-15 10:05:05.314021123  mount-shm: info: starts...
2021-10-15 10:05:05.314131240  mount-pts: info: starts...
2021-10-15 10:05:05.314229915  mount-cgroups: info: starts...
2021-10-15 10:05:05.315659306  s6-rc: info: service mount-shm successfully started
2021-10-15 10:05:05.316334041  s6-rc: info: service mount-pts successfully started
2021-10-15 10:05:05.318570576  s6-rc: info: service populate-dev successfully started
2021-10-15 10:05:05.320073855  s6-rc: info: service populate-sys successfully started
2021-10-15 10:05:05.432339819  s6-rc: info: service mount-cgroups successfully started
2021-10-15 10:05:05.432405161  s6-rc: info: service system-sysctl: starting
2021-10-15 10:05:05.432470494  s6-rc: info: service system-random: starting
2021-10-15 10:05:05.432540305  s6-rc: info: service system-hwclock: starting
2021-10-15 10:05:05.432610597  s6-rc: info: service modules-system: starting
2021-10-15 10:05:05.432682171  s6-rc: info: service modules-kernel: starting
2021-10-15 10:05:05.432751421  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.432805623  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.432864563  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.432940025  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.433050963  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:05.434477578  system-sysctl: info: starts...
2021-10-15 10:05:05.434574520  system-random: info: starts...
2021-10-15 10:05:05.434704924  modules-kernel: info: starts...
2021-10-15 10:05:05.437772568  modules-system: info: starts...
2021-10-15 10:05:05.437890619  system-hwclock: info: starts...
2021-10-15 10:05:05.438108407  kernel.sysrq = 1
2021-10-15 10:05:05.438110852  kernel.core_uses_pid = 1
2021-10-15 10:05:05.438112245  fs.protected_hardlinks = 1
2021-10-15 10:05:05.438113607  fs.protected_symlinks = 1
2021-10-15 10:05:05.438115471  fs.inotify.max_user_instances = 1024
2021-10-15 10:05:05.438117224  fs.inotify.max_user_watches = 524288
2021-10-15 10:05:05.438305948  s6-rc: info: service system-sysctl successfully started
2021-10-15 10:05:05.438387351  s6-rc: info: service system-random successfully started
2021-10-15 10:05:05.446748511  s6-rc: info: service system-hwclock successfully started
2021-10-15 10:05:05.472094555  Load modules snd-timer.ko.xz
2021-10-15 10:05:05.472098833  Load modules snd-pcm.ko.xz
2021-10-15 10:05:05.472100146  Load modules snd-aloop.ko.xz pcm_substreams=1
2021-10-15 10:05:05.472494826  s6-rc: info: service modules-system successfully started
2021-10-15 10:05:08.208918319  s6-rc: info: service modules-kernel successfully started
2021-10-15 10:05:08.209006915  s6-rc: info: service udevd: starting
2021-10-15 10:05:09.229052464  s6-rc: info: service udevd successfully started
2021-10-15 10:05:09.229118228  s6-rc: info: service udevadm: starting
2021-10-15 10:05:09.229433218  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:09.230914777  udevadm: info: starts...
2021-10-15 10:05:14.089189341  s6-rc: info: service udevadm successfully started
2021-10-15 10:05:14.089351956  s6-rc: info: service system-fontnkey: starting
2021-10-15 10:05:14.090082887  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:14.100771803  system-fontnkey: info: starts...
2021-10-15 10:05:14.124869356  s6-rc: info: service system-fontnkey successfully started
2021-10-15 10:05:14.124969353  s6-rc: info: service system-fsck: starting
2021-10-15 10:05:14.125674275  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:14.135726096  system-fsck: info: starts...
2021-10-15 10:05:14.153675699  system-fsck: info: /dev/mapper/dtopn-obarun: clean, 210093/1310720 files, 1331472/5242880 blocks
2021-10-15 10:05:14.158612017  system-fsck: info: /dev/mapper/dtopn-datafs: clean, 102100/13107200 files, 11794107/52428800 blocks
2021-10-15 10:05:14.162974338  s6-rc: info: service system-fsck successfully started
2021-10-15 10:05:14.163139969  s6-rc: info: service mount-fstab: starting
2021-10-15 10:05:14.163748149  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:14.166401876  mount-fstab: info: starts...
2021-10-15 10:05:14.173479349  s6-rc: info: service mount-fstab successfully started
2021-10-15 10:05:14.173587261  s6-rc: info: service mount-rw: starting
2021-10-15 10:05:14.174150798  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:14.176251157  mount-rw: info: starts...
2021-10-15 10:05:14.180814876  s6-rc: info: service mount-rw successfully started
2021-10-15 10:05:14.180973464  s6-rc: info: service mount-netfs: starting
2021-10-15 10:05:14.181114047  s6-rc: info: service local-tmpfiles: starting
2021-10-15 10:05:14.181230085  s6-rc: info: service local-time: starting
2021-10-15 10:05:14.181405043  s6-rc: info: service local-sethostname: starting
2021-10-15 10:05:14.181570443  s6-rc: info: service local-loop: starting
2021-10-15 10:05:14.181721446  s6-rc: info: service local-authfiles: starting
2021-10-15 10:05:14.181865657  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:14.181885444  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:14.182142296  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:14.182249116  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:14.182415969  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:14.182530434  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:14.185047594  mount-netfs: info: starts...
2021-10-15 10:05:14.185302843  local-tmpfiles: info: starts...
2021-10-15 10:05:14.186207540  local-sethostname: info: starts...
2021-10-15 10:05:14.186586981  local-loop: info: starts...
2021-10-15 10:05:14.186785193  s6-rc: info: service mount-netfs successfully started
2021-10-15 10:05:14.186793468  local-time: info: starts...
2021-10-15 10:05:14.186940745  local-authfiles: info: starts...
2021-10-15 10:05:14.188462569  s6-rc: info: service local-authfiles successfully started
2021-10-15 10:05:14.189868916  s6-rc: info: service local-loop successfully started
2021-10-15 10:05:14.192822826  s6-rc: info: service local-time successfully started
2021-10-15 10:05:14.193894616  _d /run/dbus 0755 0 0 0
2021-10-15 10:05:14.197842480  s6-rc: info: service local-sethostname successfully started
2021-10-15 10:05:14.199280086  _d /run/dhcpcd 0755 root root 0
2021-10-15 10:05:14.203013788  _d /var/lib/geoclue 0755 geoclue geoclue 0
2021-10-15 10:05:14.206755395  _w /sys/devices/system/cpu/microcode/reload - 0 0 0 1
2021-10-15 10:05:14.207596563  _d /run/initramfs 0755 root root 0
2021-10-15 10:05:14.210780744  _d /run/nscd 0755 root root 0
2021-10-15 10:05:14.214447100  _C /etc/crypttab  0 0 0
2021-10-15 10:05:14.214698973  _C /etc/fstab  0 0 0
2021-10-15 10:05:14.214926640  _C /etc/group  0 0 0
2021-10-15 10:05:14.215151101  _C /etc/gshadow  0 0 0
2021-10-15 10:05:14.215386191  _C /etc/host.conf  0 0 0
2021-10-15 10:05:14.215617706  _C /etc/hosts  0 0 0
2021-10-15 10:05:14.215847146  _C /etc/issue  0 0 0
2021-10-15 10:05:14.216074673  _C /etc/ld.so.conf  0 0 0
2021-10-15 10:05:14.216303211  _C /etc/motd  0 0 0
2021-10-15 10:05:14.216531089  _C /etc/nsswitch.conf  0 0 0
2021-10-15 10:05:14.216754027  _C /etc/passwd  0 0 0
2021-10-15 10:05:14.216974210  _C /etc/profile  0 0 0
2021-10-15 10:05:14.217205063  _C /etc/securetty  0 0 0
2021-10-15 10:05:14.217434693  _C /etc/shadow  0 0 0
2021-10-15 10:05:14.217663162  _C /etc/shells  0 0 0
2021-10-15 10:05:14.218030481  _d /run/faillock 0755 root root 0
2021-10-15 10:05:14.221631394  _d /var/empty 0755 root root 0
2021-10-15 10:05:14.224742568  _d /run/sudo 0711 root root 0
2021-10-15 10:05:14.228152183  _D /run/sudo/ts 0700 root root 0
2021-10-15 10:05:14.231958812  s6-rc: info: service local-tmpfiles successfully started
2021-10-15 10:05:14.232072134  s6-rc: info: service local-dmesg: starting
2021-10-15 10:05:14.232701064  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:14.236467247  local-dmesg: info: starts...
2021-10-15 10:05:14.246877581  s6-rc: info: service local-dmesg successfully started
2021-10-15 10:05:14.247011452  s6-rc: info: service all-Runtime: starting
2021-10-15 10:05:14.247544181  s6-ipcclient: connected to /run/66/tree/0/boot/servicedirs/s6rc-oneshot-runner/s
2021-10-15 10:05:14.251494148  all-Runtime: info: starts...
2021-10-15 10:05:14.254638195  66-all(src/lib66/svc_init.c: svc_init(): 72): info: Initialization aborted -- tty-earlier@ tty12 already initialized
2021-10-15 10:05:14.254641932  66-all(src/lib66/svc_init.c: svc_init(): 73): tracing: Write state file of: tty-earlier@ tty12
2021-10-15 10:05:14.254743102  66-all(src/lib66/ssexec_init.c: ssexec_init(): 163): warning: db of tree: boot already initialized
2021-10-15 10:05:14.254746328  66-all(src/lib66/ssexec_all.c: ssexec_all(): 350): tracing: reload scandir: /run/66/scandir/0
2021-10-15 10:05:14.257328721  66-all(src/lib66/ssexec_start.c: ssexec_start(): 344): tracing: sanitize classic services list...
2021-10-15 10:05:14.257331626  66-all(src/lib66/ssexec_start.c: ssexec_start(): 347): tracing: start classic services list ...
2021-10-15 10:05:14.257406386  66-all(src/lib66/ssexec_svctl.c: ssexec_svctl(): 580): info: Already up: tty-earlier@ tty12
2021-10-15 10:05:14.257421344  66-all(src/lib66/ssexec_start.c: ssexec_start(): 359): tracing: switch classic service list of: boot to source
2021-10-15 10:05:14.257463063  66-all(src/lib66/ssexec_start.c: ssexec_start(): 367): tracing: sanitize atomic services list...
2021-10-15 10:05:14.257471969  66-all(src/lib66/ssexec_start.c: ssexec_start(): 372): tracing: start atomic services list ...
2021-10-15 10:05:14.261936973  66-all(src/lib66/ssexec_dbctl.c: rebuild_list(): 69): info: Already up: udevd-log
2021-10-15 10:05:14.261946641  66-all(src/lib66/ssexec_dbctl.c: rebuild_list(): 69): info: Already up: udevd
2021-10-15 10:05:14.262517432  s6-rc: fatal: unable to take locks: Device or resource busy
2021-10-15 10:05:14.262584167  66-all(src/lib66/ssexec_dbctl.c: ssexec_dbctl(): 349): fatal: unable to start services selection
2021-10-15 10:05:14.263918229  all-Runtime: fatal: crashed! -- Your machine is operational but some runtime service failed to start correctly. Please see the complete boot log at /run/66/log/0/current for further information.
2021-10-15 10:05:14.264141057  s6-rc: info: service all-Runtime successfully started
2021-10-15 10:05:14.264293382  s6-rc: info: service tty-rc@ tty2: starting
2021-10-15 10:05:14.264427253  s6-rc: info: service tty-rc@ tty1: starting
2021-10-15 10:05:14.266398610  s6-rc: info: service tty-rc@ tty2 successfully started
2021-10-15 10:05:14.266561766  s6-rc: info: service tty-rc@ tty1 successfully started
2021-10-15 10:05:14.266732016  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: system-hostname
2021-10-15 10:05:14.266756762  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: system-hostname
2021-10-15 10:05:14.266759948  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: mount-run
2021-10-15 10:05:14.266777531  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: mount-run
2021-10-15 10:05:14.266780637  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: populate-run
2021-10-15 10:05:14.266797909  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: populate-run
2021-10-15 10:05:14.266800885  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: mount-tmp
2021-10-15 10:05:14.266817296  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: mount-tmp
2021-10-15 10:05:14.266820221  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: populate-tmp
2021-10-15 10:05:14.266836962  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: populate-tmp
2021-10-15 10:05:14.266839888  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: mount-proc
2021-10-15 10:05:14.266858373  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: mount-proc
2021-10-15 10:05:14.266861188  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: mount-sys
2021-10-15 10:05:14.266881797  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: mount-sys
2021-10-15 10:05:14.266884682  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: populate-sys
2021-10-15 10:05:14.266899810  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: populate-sys
2021-10-15 10:05:14.266902716  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: mount-dev
2021-10-15 10:05:14.266919066  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: mount-dev
2021-10-15 10:05:14.266921922  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: mount-pts
2021-10-15 10:05:14.266937862  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: mount-pts
2021-10-15 10:05:14.266940657  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: mount-shm
2021-10-15 10:05:14.266956937  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: mount-shm
2021-10-15 10:05:14.266959903  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: populate-dev
2021-10-15 10:05:14.266975683  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: populate-dev
2021-10-15 10:05:14.266978628  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: mount-cgroups
2021-10-15 10:05:14.266991432  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: mount-cgroups
2021-10-15 10:05:14.266999467  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: 00
2021-10-15 10:05:14.267007502  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: 00
2021-10-15 10:05:14.267015517  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: system-hwclock
2021-10-15 10:05:14.267023422  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: system-hwclock
2021-10-15 10:05:14.267031577  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: modules-kernel
2021-10-15 10:05:14.267039683  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: modules-kernel
2021-10-15 10:05:14.267047658  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: system-random
2021-10-15 10:05:14.267055853  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: system-random
2021-10-15 10:05:14.267063868  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: modules-system
2021-10-15 10:05:14.267072184  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: modules-system
2021-10-15 10:05:14.267080219  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: system-sysctl
2021-10-15 10:05:14.267088234  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: system-sysctl
2021-10-15 10:05:14.267106778  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: udevd-log
2021-10-15 10:05:14.267122909  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: udevd-log
2021-10-15 10:05:14.267130814  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: udevd
2021-10-15 10:05:14.267150030  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: udevd
2021-10-15 10:05:14.267152835  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: udevadm
2021-10-15 10:05:14.267169236  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: udevadm
2021-10-15 10:05:14.267172171  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: system-fontnkey
2021-10-15 10:05:14.267188241  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: system-fontnkey
2021-10-15 10:05:14.267191147  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: all-Mount
2021-10-15 10:05:14.267206626  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: all-Mount
2021-10-15 10:05:14.267209431  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: system-fsck
2021-10-15 10:05:14.267224129  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: system-fsck
2021-10-15 10:05:14.267227024  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: mount-fstab
2021-10-15 10:05:14.267242493  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: mount-fstab
2021-10-15 10:05:14.267245378  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: all-System
2021-10-15 10:05:14.267260717  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: all-System
2021-10-15 10:05:14.267263522  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: mount-rw
2021-10-15 10:05:14.267280154  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: mount-rw
2021-10-15 10:05:14.267283189  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: local-sethostname
2021-10-15 10:05:14.267300562  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: local-sethostname
2021-10-15 10:05:14.267303477  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: mount-netfs
2021-10-15 10:05:14.267319918  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: mount-netfs
2021-10-15 10:05:14.267322774  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: local-loop
2021-10-15 10:05:14.267339174  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: local-loop
2021-10-15 10:05:14.267342030  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: local-time
2021-10-15 10:05:14.267358450  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: local-time
2021-10-15 10:05:14.267361506  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: local-authfiles
2021-10-15 10:05:14.267369651  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: local-authfiles
2021-10-15 10:05:14.267372527  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: local-tmpfiles
2021-10-15 10:05:14.267380362  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: local-tmpfiles
2021-10-15 10:05:14.267383347  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: local-dmesg
2021-10-15 10:05:14.267391232  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: local-dmesg
2021-10-15 10:05:14.267394137  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: all-Local
2021-10-15 10:05:14.267401932  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: all-Local
2021-10-15 10:05:14.267404827  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: all-Runtime
2021-10-15 10:05:14.267412612  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: all-Runtime
2021-10-15 10:05:14.267415357  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: All
2021-10-15 10:05:14.267423462  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: All
2021-10-15 10:05:14.267431568  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: tty-rc@ tty1
2021-10-15 10:05:14.267439633  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: tty-rc@ tty1
2021-10-15 10:05:14.267449712  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: tty-rc@ tty2
2021-10-15 10:05:14.267459300  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: tty-rc@ tty2
2021-10-15 10:05:14.267462856  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 163): tracing: Write state file of: boot@ system
2021-10-15 10:05:14.267472585  66-dbctl(src/lib66/ssexec_dbctl.c: check_status(): 169): info: Started successfully: boot@ system
I don't know if it's relevant, but this is a minimal install which was done manually from the live usb following the procedure mentioned here.
Galeano wrotesudo 66-tree -D boot
Thank you, this is the solution. My mistake was that I wanted to explicitly mark the root tree to run after the boot tree, and one can only do that if both trees are enabled. I assumed that it was ok for the boot tree to remain enabled.

For others finding this thread in the future with a similar problem: the boot tree must remain disabled as Galeano said and it is brought up before every other tree regardless, so there is no need to explicitly mark trees to run after boot.

EDIT: Eric's explanation of the peculiarities of the boot tree is here.

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