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Bug 1782321

Summary: zipl: BOOT_IMAGE=0 should not be added to /boot/loader/entries
Product: Red Hat Enterprise Linux 8 Reporter: Thomas Huth <thuth>
Component: s390utilsAssignee: Dan Horák <dhorak>
Status: CLOSED ERRATA QA Contact: Vilém Maršík <vmarsik>
Severity: medium Docs Contact:
Priority: medium    
Version: 8.2CC: dhorak, fmartine, javierm, jhlavac, rvr
Target Milestone: rcFlags: pm-rhel: mirror+
Target Release: 8.2   
Hardware: s390x   
OS: Linux   
Whiteboard:
Fixed In Version: s390utils-2.6.0-25.el8 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-04-28 16:49:37 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
PATCH] - skip BOOT_IMAGE param when copying the cmdline to BLS snippets none

Description Thomas Huth 2019-12-11 14:19:43 UTC 
Description of problem:
I'm facing an issue how zipl handles the BOOT_IMAGE=... parameters on my LPAR in RHEL8 (btw, this did not used to be a problem in RHEL7): zipl apparently adds a BOOT_IMAGE=0 to the kernel command line, as you can see in /proc/cmdline. Now when installing a new kernel, zipl adds this BOOT_IMAGE=0 to the new entry in /boot/loader/entries/. After the next reboot, zipl adds an additional BOOT_IMAGE=0 to the kernel command line, so that there are now two "BOOT_IMAGE=0" strings in /proc/cmdline. If you now install another kernel, its entry in /boot/loader/entries/ has two "BOOT_IMAGE=0" strings, too. And then, after the next reboot, you have three "BOOT_IMAGE=0" in /proc/cmdline, i.e. each time you reboot and install a new kernel afterwards, you have one additional "BOOT_IMAGE=0" in your kernel parameters.
When I noticed the problem for the first time, I had already lots of these in my boot loader entries:

# cd /boot/loader/entries/
# grep BOOT_IMAGE *
f6d92c23a77d4d3994e45865208f28af-4.18.0-160.el8.s390x.conf:options root=/dev/mapper/rhel_kerneldev9-root crashkernel=auto rd.dasd=0.0.7000 rd.dasd=0.0.7100 rd.dasd=0.0.7200 rd.dasd=0.0.7300 rd.lvm.lv=rhel_kerneldev9/root rd.lvm.lv=rhel_kerneldev9/swap cio_ignore=all,!condev,!0.0.7008-0.0.700f rd.znet=qeth,0.0.0900,0.0.0901,0.0.0902,layer2=1,portno=0 LANG=en_DK.UTF-8 BOOT_IMAGE=0 BOOT_IMAGE=0 $tuned_params BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0 BOOT_IMAGE=0

Version-Release number of selected component (if applicable):
s390utils-base-2.6.0-23.el8.s390x

How reproducible:
100%

Steps to Reproduce:
1. Start with a clean system: "grep BOOT_IMAGE /boot/loader/entries/*" does not show any occurances.
2. Note that there is a "BOOT_IMAGE=0" in /proc/cmdline (likely added by zipl during boot)
3. Install a new kernel: yum install kernel*.rpm
4. The BOOT_IMAGE=0 got added to the new entry:

# grep BOOT_IMAGE /boot/loader/entries/*
/boot/loader/entries/f6d92c23a77d4d3994e45865208f28af-4.18.0-163.el8.s390x.conf:options root=/dev/mapper/rhel_kerneldev9-root crashkernel=auto rd.dasd=0.0.7000 rd.dasd=0.0.7100 rd.dasd=0.0.7200 rd.dasd=0.0.7300 rd.lvm.lv=rhel_kerneldev9/root rd.lvm.lv=rhel_kerneldev9/swap cio_ignore=all,!condev,!0.0.7008-0.0.700f rd.znet=qeth,0.0.0900,0.0.0901,0.0.0902,layer2=1,portno=0 LANG=en_DK.UTF-8 $tuned_params BOOT_IMAGE=0

5. Reboot, and you can now see two "BOOT_IMAGE=0" strings in /proc/cmdline, e.g.:

# cat /proc/cmdline 
root=/dev/mapper/rhel_kerneldev9-root crashkernel=auto rd.dasd=0.0.7000 rd.dasd=0.0.7100 rd.dasd=0.0.7200 rd.dasd=0.0.7300 rd.lvm.lv=rhel_kerneldev9/root rd.lvm.lv=rhel_kerneldev9/swap cio_ignore=all,!condev,!0.0.7008-0.0.700f rd.znet=qeth,0.0.0900,0.0.0901,0.0.0902,layer2=1,portno=0 LANG=en_DK.UTF-8 $tuned_params BOOT_IMAGE=0 BOOT_IMAGE=0

6. Go back to step 3 if you want to see yet another occurance of the string in your kernel command line.


Actual results:
"BOOT_IMAGE=0" shows up in the files in /boot/loader/entries/

Expected results:
"BOOT_IMAGE=..." should not be added to the files in /boot/loader/entries/
Comment 1 Dan Horák 2019-12-11 14:53:46 UTC 
Thomas, thanks for the report, I noticed this behaviour as well, but haven't filed a bug yet.

Javier, I think this one is for you too. I guess the kernel-install scripts will need fixing.
Comment 2 Javier Martinez Canillas 2019-12-12 14:06:00 UTC 
(In reply to Dan Horák from comment #1)
> Thomas, thanks for the report, I noticed this behaviour as well, but haven't
> filed a bug yet.
> 
> Javier, I think this one is for you too. I guess the kernel-install scripts
> will need fixing.

That's correct. Since the BOOT_IMAGE parameter is added by the bootloader, the kernel-install plugins should skip this when setting the kernel command line in the BLS snippets.

I'll attach a fix for this.
Comment 3 Javier Martinez Canillas 2019-12-12 14:12:07 UTC 
Created attachment 1644429 [details]
PATCH] - skip BOOT_IMAGE param when copying the cmdline to BLS  snippets
Comment 4 Dan Horák 2019-12-12 15:52:09 UTC 
Javier, thanks for the patch. I'll work on getting it into the rpm.
Comment 6 Vilém Maršík 2020-03-12 01:16:10 UTC 
Reproduced:
===========
# rpm -U --oldpackage s390utils-base-2.6.0-23.el8.s390x.rpm
# grep BOOT_IMAGE /boot/loader/entries/*
# cat /proc/cmdline
root=/dev/mapper/rhel_ibm--z--101-root crashkernel=auto rd.dasd=0.0.0120 rd.dasd=0.0.0121 rd.dasd=0.0.0122 rd.dasd=0.0.0123 rd.lvm.lv=rhel_ibm-z-101/root rd.lvm.lv=rhel_ibm-z-101/swap rd.znet=qeth,0.0.8000,0.0.8001,0.0.8002,layer2=1,portname=z-101,portno=0 BOOT_IMAGE=0
# yum install kernel*.rpm
(...)
# grep BOOT_IMAGE /boot/loader/entries/*
/boot/loader/entries/36129a31b4224825b8658cedbc52dd07-4.18.0-187.1.el8.s390x.conf:options root=/dev/mapper/rhel_ibm--z--101-root crashkernel=auto rd.dasd=0.0.0120 rd.dasd=0.0.0121 rd.dasd=0.0.0122 rd.dasd=0.0.0123 rd.lvm.lv=rhel_ibm-z-101/root rd.lvm.lv=rhel_ibm-z-101/swap rd.znet=qeth,0.0.8000,0.0.8001,0.0.8002,layer2=1,portname=z-101,portno=0 BOOT_IMAGE=0 $tuned_params

And verified:
=============
# rpm -e kernel-4.18.0-187.1.el8.s390x kernel-modules-4.18.0-187.1.el8.s390x kernel-core-4.18.0-187.1.el8.s390x
# dnf upgrade s390utils-base
(...)
Upgraded:
  s390utils-base-2:2.6.0-28.el8.s390x
Complete!
# grep BOOT_IMAGE /boot/loader/entries/*
# cat /proc/cmdline
root=/dev/mapper/rhel_ibm--z--101-root crashkernel=auto rd.dasd=0.0.0120 rd.dasd=0.0.0121 rd.dasd=0.0.0122 rd.dasd=0.0.0123 rd.lvm.lv=rhel_ibm-z-101/root rd.lvm.lv=rhel_ibm-z-101/swap rd.znet=qeth,0.0.8000,0.0.8001,0.0.8002,layer2=1,portname=z-101,portno=0 BOOT_IMAGE=0
# yum install kernel*.rpm
(...)
Complete!
# grep BOOT_IMAGE /boot/loader/entries/*
# rpm -q s390utils-base
s390utils-base-2.6.0-28.el8.s390x
Comment 8 errata-xmlrpc 2020-04-28 16:49:37 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:1826