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mkosi-mainline "Failed to start initrd-switch-root.service - Switch Root." #287

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solardiz opened this issue Sep 13, 2023 · 7 comments · Fixed by #288
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mkosi-mainline "Failed to start initrd-switch-root.service - Switch Root." #287

solardiz opened this issue Sep 13, 2023 · 7 comments · Fixed by #288
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testing A testing task or issue (e.g., with CI)

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@solardiz
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@vt-alt mkosi-mainline is failing for 2 days with:

 [  OK  ] Reached target initrd-switch-root.target - Switch Root.
         Starting initrd-switch-root.service - Switch Root...
[FAILED] Failed to start initrd-switch-root.service - Switch Root.
See 'systemctl status initrd-switch-root.service' for details.

Generating "/run/initramfs/rdsosreport.txt"
@solardiz solardiz added the testing A testing task or issue (e.g., with CI) label Sep 13, 2023
@vt-alt
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vt-alt commented Sep 13, 2023

Looks like boot failure. Ubuntu seems diverging more and more from that old mkosi we use.

@vt-alt
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vt-alt commented Sep 18, 2023 •
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It seems that GitHub does not even plan to add Ubuntu newer than 22.04 on runners in foreseeable future, so we still cannot start to use latest mkosi again.

@solardiz
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@vt-alt So we need to use mkosi v14 tag, right? Will you please make this change? Thanks!

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vt-alt commented Sep 18, 2023

We already using v14.

I thought - maybe we finally can switch to a newer mkosi to fix the issue, but it's not time yet.

@solardiz
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@vt-alt Ah, so since we have to stay with v14, we should also stay with older Ubuntu? Can we?

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vt-alt commented Sep 18, 2023

Cannot, because (the) mainline kernels are for bleeding edge Ubuntu-s by design.

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vt-alt commented Sep 20, 2023 •
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I debugged the boot process and found that the immediate cause of the boot failure is Dracut not mounting the root filesystem even though all devices are present.

Dracut does not say why but with debug enabled (rd.debug rd.debugverbose) it says too much and it's still unclear why.

Instead of delving deeper and becoming Dracut expert, it occurs to me that we can simply pass root=LABEL=root into cmdline, as mkosi creates root fs with the label root. And the experiment shows that this works.

ps. When failure first occurred dracut version is unchanged being dracut-059-4ubuntu2.
pps. What is changed:

-Preparing to unpack .../systemd_253.5-1ubuntu4_amd64.deb ...
+Preparing to unpack .../systemd_253.5-1ubuntu5_amd64.deb ...

Perhaps we are affected by this change backporting https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=a366279a84730e92ed734710560ea833709f359d deleting systemd-gpt-auto-generator for unspecified reasons.

vt-alt added a commit to vt-alt/lkrg that referenced this issue Sep 20, 2023
@vt-alt
CI: mkosi: Fix mainline boot on Ubuntu mantic
2c6bb13 
Ubuntu removed 'systemd-gpt-auto-generator' from systemd_253.5-1ubuntu5,
causing dracut to be unable to find the root partition without
assistance. It appears that specifying the root label could be a good
solution.

Fixes: lkrg-org#287
Signed-off-by: Vitaly Chikunov <[email protected]>
@vt-alt vt-alt mentioned this issue Sep 20, 2023
Merged
solardiz pushed a commit that referenced this issue Sep 20, 2023
@vt-alt @solardiz
CI: mkosi: Fix mainline boot on Ubuntu mantic
73840d7 
Ubuntu removed 'systemd-gpt-auto-generator' from systemd_253.5-1ubuntu5,
causing dracut to be unable to find the root partition without
assistance. It appears that specifying the root label could be a good
solution.

Fixes: #287
Signed-off-by: Vitaly Chikunov <[email protected]>
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CI: mkosi: Fix mainline boot on Ubuntu mantic vt-alt/lkrg
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@solardiz @vt-alt