Public bug reported:
A dracut generated initrd on Questing Quokka does not contain the
mlx5_core, as a result, boot via a network based device will fail if our
NIC uses that module.
As an example, Oracle Cloud uses iSCSI based boot devices. On bare metal
instances, it is very common to use the mlx5_core module. The same image
that works well in a virtualized disk, will fail to boot in an iSCSI
based device and drop into a shell prompt. Checking 'ip a' command, you
can see that the only listed network interface is lo0 (due to the
missing module for the physical nic):
sh-5.2# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host noprefixroute
valid_lft forever preferred_lft forever
Re-generating the initrd with the following command fixes the issue:
sudo dracut -f --regenerate-all -H --hostonly-mode=sloppy --add-drivers
"mlx5_core"
As a workaround, you can create the following config file, so that you
always include that module when generating an initrd:
$ sudo cat /etc/dracut.conf.d/ubuntu-vfio.conf
add_drivers+=" mlx5_core "
The versions being used in this instance are:
$ sudo lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Questing Quokka (development branch)
Release: 25.10
Codename: questing
$ sudo dpkg -l | grep dracut
ii dracut-core 107-1ubuntu1
amd64 dracut is an event driven initramfs infrastructure (core
tools)
ii dracut-install 107-1ubuntu1
amd64 dracut is an event driven initramfs infrastructure
(dracut-install)
ii dracut-network 107-1ubuntu1
all dracut is an event driven initramfs infrastructure (network
modules)
$ sudo uname -a
Linux fabio-questing-amd64-golden 6.14.0-1007-oracle #7+25.10.1-Ubuntu SMP Thu
Jun 19 13:30:49 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
And cmdline option being configured on grub for the iscsi boot is:
GRUB_CMDLINE_LINUX_DEFAULT="console=tty1 console=ttyS0
nvme_core.shutdown_timeout=10 crash_kexec_post_notifiers rd.luks=0
rd.md=0 rd.dm=0 rd.net.timeout.carrier=5
rd.iscsi.param=node.session.timeo.replacement_timeout=6000 net.ifnames=1
ipmi_si.tryacpi=0 ipmi_si.trydmi=0 libiscsi.debug_libiscsi_eh=1
rd.net.timeout.dhcp=10 ip=dhcp netroot=iscsi rd.iscsi.firmware=1"
** Affects: dracut (Ubuntu)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2116259
Title:
dracut generated initramfs doesn't include mlx5_core module
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/dracut/+bug/2116259/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
