Can your provide the terminal output of running update-initramfs with
the -v switch? Thanks in advance.
** Changed in: initramfs-tools (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1729836
Title:
update-initramfs generating unbootable initrd files
Status in initramfs-tools package in Ubuntu:
Incomplete
Bug description:
After running 'update-initramfs -u -k $(uname -r)', Linux will not
boot. With 'quiet splash' set in grub, it appears to freeze after the
'Loading ramdisk...' message, and if booted in recovery mode, I see
the following kernel panic:
Freeing unused kernel memory: 948k
Freeing unused kernel memory: 104K
x86/mm: Chcked W+X mappings: passed, no W+X pages found.
Failed to execute /init (error -2)
Kernel panic - not syncing: No working init found. Try passing init= optin
to kernel. See Linux Documentation/admin-guide/init.rst for guidance.
CPU: 6 PID: 1 Comm: swapper/0 Not tainted 4.13.0-16-generic #19-Ubuntu
Hardware name: Dell Inc. OptiPlex 990/0D6H9T, BIOS A07 09/10/2011
Call Trace:
dump_stack+0x63/0x8b
? rest_init+0xb0/0xc0
panic+0xe4/0x23d
? putname+0x4b/0x50
? rest_init+0xc0/0xc0
kernel_init+0xeb/0xfc
ret_from_fork0x25/0x30
Kernel Offset: 0x1fc00000 from 0xffffffff8a000000 (relocation range:
0xffffffff80000000-0xffffffffbfffffff)
---[ end Kernel panic - no syncing: No working init found. Try passing init=
option to kernel. See Linux Documentation/admin-guide/init.rst for guidance.
(full screenshot at https://photos.app.goo.gl/XLNKOM3cDNHsfyFt2).
Examining the initrd files, here is a good one, as installed by the
Ubuntu 17.10 installer:
# file /boot/initrd.img-4.13.0-16-generic
/boot/initrd.img-4.13.0-16-generic: ASCII cpio archive (SVR4 with no CRC)
# ls -la /boot/initrd.img-4.13.0-16-generic
-rw-r--r-- 1 root root 50764087 Nov 3 21:02
/boot/initrd.img-4.13.0-16-generic
and here is the file after 'update-initramfs -u -k 4.13.0-16-generic':
# file /boot/initrd.img-4.13.0-16-generic
/boot/initrd.img-4.13.0-16-generic: gzip compressed data, last modified: Thu
Nov 2 10:51:42 2017, from Unix
root@jturner-home:/boot# ls -la /boot/initrd.img-4.13.0-16-generic
-rw-r--r-- 1 root root 50895514 Nov 3 21:01
/boot/initrd.img-4.13.0-16-generic
Good and bad initrds can be downloaded from
https://drive.google.com/drive/folders/1reMWj1TohrQ4K5EbBMJPhw4xXUdBi0K9?usp=sharing
After downloading initrd.img-4.13.0-16-generic-broken, the panic can
be replicated in qemu with:
kvm -m 1G -kernel /boot/vmlinuz-4.13.0-16-generic -initrd
/boot/initrd.img-4.13.0-16-generic-broken
(tip obtained from https://lists.debian.org/debian-
kernel/2016/02/msg00323.html)
I've experienced this problem with Ubuntu 17.04 and 17.10 on two
separate PCs (both Dell OptiPlex 990s). Ubuntu boots fine initially,
until one day I update the kernel or something, and a .deb postinst
script calls update-initramfs and trashes that kernel's initrd file.
If I run 'update-initramfs -u -k all', all my old initrd files are
toast.
The "good" initrd format "ASCII cpio archive (SVR4 with no CRC)" is
strange. I'm not getting many google hits on it. None of my other
Ubuntu/Debian servers use that format in their initrds.
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: initramfs-tools 0.125ubuntu12
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
Date: Fri Nov 3 21:33:12 2017
InstallationDate: Installed on 2017-08-05 (90 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
PackageArchitecture: all
SourcePackage: initramfs-tools
UpgradeStatus: Upgraded to artful on 2017-10-24 (10 days ago)
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