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Hexxeh / rpi-update

An easier way to update the firmware of your Raspberry Pi
MIT License
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Boot fails in encrypted sdcard after running `rpi-update` #314

Closed jzazo closed 3 years ago

jzazo commented 3 years ago

Hi! I recently got an RP4 and was experimenting with it and trying LUKS encryption following the steps described in this pot: https://www.raspberrypi.org/forums/viewtopic.php?t=219867

After completing the steps, with encrypted sdcard, RP4 could boot normally. I then ran sudo rpi-update as part of other set of instructions and after reboot I would get the following error:

Cannot initialize device-mapper. Is dm_mod kernel module loaded?

I tried fixing it by rebuilding initramfs following this procedure, but it did not work. I will fall back to not using rpi-update after encryption, but wanted report this error as suggested in the original thread.

pelwell commented 3 years ago

Your forum post includes the following:

Everything worked perfectly, until I did "sudo apt full-upgrade" and "sudo rpi-update"

and yet you omitted the "apt full-upgrade" part from this Issue...

jzazo commented 3 years ago

You are right, thanks for the correction. The set of instructions I linked specified that, and sudo apt update.

pelwell commented 3 years ago

Because you performed both steps you now can't tell which was the cause of the breakage.

rpi-update is just an app that downloads over a network interface and writes files to an SD card or USB device. Provided it downloads and writes files to completion, it can't be blamed for any resulting errors. If the firmware or kernel is bad then the fault lies with the firmware or kernel. If the SD card/USB device gets corrupted then the fault lies with the device or the kernel.

jzazo commented 3 years ago

I will try to reproduce at the end of the day today doing the first command only and rebooting; then the second, if you think that is meaningful.

My thought was that as a new kernel is installed, the modules change and initramfs is not updated accordingly. Also, I thought the old kernel might be removed and that's why it can no longer boot. I also thought that rpi-update was the one responsible for updating the kernel, but I will confirm if in this occasion it is the case.

I have a very shallow understanding of what could be happening, though.

jzazo commented 3 years ago

I reinstalled the system and repeated the steps. The boot definitely fails after running sudo rpi-update. I understand that the failure is not rpi-update's fault, rather the kernel's, so I am happy to close this issue and reopen where it corresponds. Is the raspberry's kernel repo the right place to do this? Any idea of what is the issue also? Thanks.