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Bug 2051889 - "Weak" grub2.cfg file generated on PPC64LE platform
Summary: "Weak" grub2.cfg file generated on PPC64LE platform
Keywords:
Status: CLOSED MIGRATED
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: grub2
Version: 8.7
Hardware: ppc64le
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Bootloader engineering team
QA Contact: Release Test Team
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-02-08 09:58 UTC by Renaud Métrich
Modified: 2023-09-16 13:26 UTC (History)
7 users (show)

Fixed In Version: grub2-2.02-151.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2023-09-16 13:23:37 UTC
Type: Bug
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)
patch (1.46 KB, application/mbox)
2023-03-31 11:24 UTC, Marta Lewandowska
no flags Details


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker   RHEL-4314 0 None Migrated None 2023-09-16 13:23:32 UTC
Red Hat Issue Tracker RHELPLAN-111449 0 None None None 2022-02-08 10:09:00 UTC

Description Renaud Métrich 2022-02-08 09:58:41 UTC
Description of problem:

On PPC64LE platforms we disable GRUB_ENABLE_BLSCFG=true to force having a completely hardcoded grub2.cfg file with "menuentry" items.

This works fine except the $kernelopts variable is not designed as fallback in case grubenv is broken.

Following snippet is missing:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
# The kernelopts variable should be defined in the grubenv file. But to ensure that menu
# entries populated from BootLoaderSpec files that use this variable work correctly even
# without a grubenv file, define a fallback kernelopts variable if this has not been set.
#
# The kernelopts variable in the grubenv file can be modified using the grubby tool or by
# executing the grub2-mkconfig tool. For the latter, the values of the GRUB_CMDLINE_LINUX
# and GRUB_CMDLINE_LINUX_DEFAULT options from /etc/default/grub file are used to set both
# the kernelopts variable in the grubenv file and the fallback kernelopts variable.
if [ -z "${kernelopts}" ]; then
  set kernelopts="..."
fi
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------

Version-Release number of selected component (if applicable):

grub2-2.02-106.el8

How reproducible:

Always

Steps to Reproduce:
1. Generate the file on PPC64le

  # grub2-mkconfig -o /tmp/foo

2. Check content

  # grep kernelopts /tmp/foo
	 linux /vmlinuz-4.18.0-147.el8.ppc64le $kernelopts $tuned_params
	 linux /vmlinuz-0-rescue-3199ef9eefd840ffb6e94a87b592a6ea $kernelopts


Actual results:

No fallback "if [ -z "${kernelopts}" ]; then ... fi" code

Expected results:

Fallback snippet from /etc/grub.d/10_linux found on x86_64 systems

Comment 2 Renaud Métrich 2023-03-21 09:45:54 UTC
Hello,

It's now a long time I opened this and still nothing happened, even though the proposed fix is easy to implement.

Implementing such fix will definitely help getting less customer cases, when issue happens due to corrupted grubenv file.

Thank you for your understanding.

Renaud.

Comment 3 Marta Lewandowska 2023-03-24 13:24:46 UTC
Hi Renaud,
you're right that it's been a long time. We have a test build that we will run tests on for regressions and other unanticipated issues. Clearly this won't make it into the next release, so we'll target 8.9 instead. Sorry about that, and thanks for understanding. :)

Comment 4 Marta Lewandowska 2023-03-31 11:24:01 UTC
Created attachment 1954878 [details]
patch

Comment 5 Marta Lewandowska 2023-03-31 11:25:21 UTC
Removing /boot/grub2/grubenv or doing grub2-editenv - set kernelopts=
and keeping GRUB_ENABLE_BLSCFG=true in /etc/default/grub
and rebooting, causes kernel to lose its cmdline.

Installing Renaud's fix and running grub2-mkconfig -o /boot/grub2/grub.cfg enables successful boot on ppc even in the absence of grubenv.

Comment 7 RHEL Program Management 2023-09-16 13:23:20 UTC
Issue migration from Bugzilla to Jira is in process at this time. This will be the last message in Jira copied from the Bugzilla bug.

Comment 8 RHEL Program Management 2023-09-16 13:23:37 UTC
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