[Nix-dev] NixOS hangs on boot after upgrading 15.09 -> 16.03; systemd update to blame?

[zimbatm]

Try re-running nixos-install to regenerate the hardware.nix file. If that
doesn't work I guess it depends on your config and hardware so more info on
that would be useful.

On Thu, 23 Jun 2016, 11:55 Tomasz Czyż, <tomasz.czyz at gmail.com> wrote:

> James, maybe it's worth to open the ticket on
> https://github.com/NixOS/nixpkgs/issues/
>
> 2016-06-23 4:08 GMT+01:00 James Cook <james.cook at utoronto.ca>:
>
>> On 22 June 2016 at 19:27, James Cook <james.cook at utoronto.ca> wrote:
>> > After updating my desktop from 15.09 to 16.03, it hangs on boot after
>> > printing the message "regenerating udev hardware database". I do not
>> > think the problem is directly related to that message; see below. Any
>> > ideas for debugging this?
>> >
>> > Here's what I've figured out so far:
>> >
>> > * Using git-bisect, it seems that the problem starts at commit
>> > ecbe04b4, "systemd: Update to 225". (I had to cherry-pick 3cc04956,
>> > "libseccomp: Fix hash", to got it to build.)
>> >
>> > * I don't think the script that prints "regenerating udev hardware
>> > database" is the one that hangs. I added a debugging echo command to
>> > the end of system.activationScripts.udevd (in
>> > nixos/modules/services/hardware/udev.nix), and I saw the extra message
>> > when I booted. So the hang happens after.
>> >
>> > My next step was going to be to add more debugging statements to the
>> > boot process, but I'm having trouble figuring out where any of that
>> > stuff is. I can't find where system.activationScripts.udevd is called
>> > from, and I was mystified to find that grep -R "egenerating udev"
>> > /nix/store/(...)-nixos-16.0.3.git.3cc0495M produces no output (except
>> > some errors, e.g. etc/zoneinfo/posix is a directoly loop).
>> >
>> > James
>>
>> Another note: the problem also happens on master (commit 0167eef9).
>> The "regenerating udev hardware database..." message is no longer
>> printed at master; the last messages before the hang are "setting up
>> /etc..." and a bunch of "removing obsolete symblink ..." and "removing
>> group ..." messages.
>>
>> James
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>>
>
>
>
> --
> Tomasz Czyż
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