s6-rc gets stuck easily (reboot doesn't work, or "s6-rc: fatal: unable to take locks") #9

New Issue

dan · 2024-02-08T17:50:41Z

dan commented

2024-02-08 17:50:41 +00:00

It seems all too common to get into a state where any s6-rc operation results in either nothing happening (e.g. when you type "reboot" and it doesn't) you get a message s6-rc: fatal: unable to take locks: Resource busy. Usually this is when some service has failed to start.

Hopefully this is some simple configuration thing I've messed up

It seems all too common to get into a state where any `s6-rc` operation results in either nothing happening (e.g. when you type "reboot" and it doesn't) you get a message `s6-rc: fatal: unable to take locks: Resource busy`. Usually this is when some service has failed to start. Hopefully this is some simple configuration thing I've messed up

dan added the

bug

label 2024-02-08 17:50:41 +00:00

dan commented

2024-02-17 11:21:15 +00:00

Poster

On devices with bridges, the reason we can't reboot is that there is a service to add each
lan device to the bridge which does ifwait $dev running, which doesn't
return until there's something plugged in. So s6-rc hangs indefinitely
until the lan switch is fully populated.

Another example of "thing that depends on other thing but which it
is actually OK if neither of them happen" might be "mount a
filesystem if there is a usb mass storage device attached"

We probably need some affordance for services (or bundles) that aren't part of the default target,
but are plumbed them into events of some kind (netlink?) to bring them up/down

(we can use s6-rc instanced services:
https://skarnet.org/software/s6/instances.html)

On devices with bridges, the reason we can't reboot is that there is a service to add each lan device to the bridge which does `ifwait $dev running`, which doesn't return until there's something plugged in. So s6-rc hangs indefinitely until the lan switch is fully populated. Another example of "thing that depends on other thing but which it is actually OK if neither of them happen" might be "mount a filesystem if there is a usb mass storage device attached" We probably need some affordance for services (or bundles) that aren't part of the default target, but are plumbed them into events of some kind (netlink?) to bring them up/down (we can use s6-rc instanced services: https://skarnet.org/software/s6/instances.html)

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