[SOLVED]kernel -> error: out of memory with dm-crypt enabled

archenroot · Loading kernel 4.18.10 error: out of memory

Hi guys,

I went trough https://wiki.gentoo.org/wiki/Full_Disk_Encryption_From_Scratch_Simplified tutorial about how to enable encryption on root partition.
I have initramfs built-in within kernel image (not 2 separate files).

After enabling all required configuration when I try to boot from grub I get error:

khayyam · Posted: Thu Oct 04, 2018 10:31 am Post subject:

archenroot ...

how are you supplying the INITRAMFS_SOURCE? Sounds as though you may be providing a compressed cpio image (which I think is what genkernel outputs by default), when it should either be an uncompressed cpio or a directory tree.

best ... khay

archenroot · Posted: Thu Oct 04, 2018 12:53 pm Post subject:

Ok, nice catch, make sense to me.

When I check content of /usr/src/linux/.config file I get:

khayyam · Posted: Thu Oct 04, 2018 1:24 pm Post subject:

archenroot · Posted: Fri Oct 05, 2018 7:39 am Post subject:

Thanks for hints, but I think you interpret COMPRESSION_NONE wrong or I don't understand your statement. NONE means no compression will be used, so I cannot sellect any compression method.

Additionally I just compared my 2 machines. I have workstation with 64GB ram and this Dell XPS 15 laptop 32GB ram which I am now installing, but that one with encrypted ROOT partition.

Workstation is configured as:
1. genkernel.conf

archenroot · Posted: Fri Oct 05, 2018 8:27 am Post subject:

Not sure if that is the case, but I found following issue on other cpu platform:
https://bugzilla.redhat.com/show_bug.cgi?id=1615969

Also noticed my kernel on laptop is quite big, about 200MB vs about 60MB on workstation.
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khayyam · Posted: Fri Oct 05, 2018 9:01 am Post subject:

archenroot · Posted: Tue Oct 09, 2018 11:02 am Post subject:

I was busy by joining new job onboard, but, the size of kernel was so big because:
1. I have lot of things enabled as running on laptop and need simply lot of drivers
2. I had an option to all modules in ram disk

As I had issues with my own kernel config which was 2 years old. I simply did excersize to use Live DVD config and just cut off as much as possible, this resulted in following sizes:
5.1M Oct 8 23:51 kernel-genkernel-x86_64-4.14.65-gentoo
75M Oct 8 23:55 initramfs-genkernel-x86_64-4.14.65-gentoo

So it is much better I think, lol.

I will now try to integrate initramfs into kernel to build stub, so in the end I don't need grub and can boot directly via UEFI motherboard loader. Still initramfs are quite big against yours :-)

, I build those via:

archenroot · Posted: Tue Oct 09, 2018 11:03 am Post subject:

Anyway thx for your helping hints about how to get out!
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Emperor wants to control outer space Yoda wants to explore inner space that's the fundamental difference between good and bad sides of the Force

khayyam · Posted: Tue Oct 09, 2018 1:50 pm Post subject:

archenroot ...

my initramfs is built with better-initramfs ... and so cryptsetup, lvm2, etc, are built, and statically linked to, musl. Your genkernel built initramfs will use the host libc, and so linked against glibc. Some of the size difference is due to this, the rest is due to better-initramfs not including kernel modules, everything needed to boot is builtin to the kernel.

You could give the pre-built initramfs a shot ... but you would need to make sure that your kernel has =y for those drivers needed to access AHCI, and mount your filesystem.

You're welcom & best ... khay

archenroot · Posted: Thu Oct 11, 2018 9:21 am Post subject:

So here we are, thx for detailed explanation, I learned something new and thx for tip with better-initramfs links, etc.

Have a good day!

Ladislav
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Emperor wants to control outer space Yoda wants to explore inner space that's the fundamental difference between good and bad sides of the Force