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Bug 1819666

Summary:	Tuned seems to leave over old kernel cmdline conditionally
Product:	Red Hat Enterprise Linux 8	Reporter:	Pei Zhang <pezhang>
Component:	grubby	Assignee:	Bootloader engineering team <bootloader-eng-team>
Status:	CLOSED ERRATA	QA Contact:	Release Test Team <release-test-team-automation>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	8.3	CC:	bootloader-eng-team, chayang, fmartine, jaredz, jeder, jinzhao, jmario, jskarvad, juzhang, lcapitulino, mhou, mlewando, mtosatti, peterx, pjanda, pzatko, rcheerla, sbarcomb, vcojot
Target Milestone:	rc	Keywords:	Triaged, ZStream
Target Release:	8.5	Flags:	pm-rhel: mirror+
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	grubby-8.40-42.el8	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:
Clones:	1921577 1972908 1972909 2236821 (view as bug list)		Environment:
Last Closed:	2021-11-09 20:05:06 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:
Bug Depends On:
Bug Blocks:	1932086, 1972908, 1972909, 2236821

Description Pei Zhang 2020-04-01 09:37:45 UTC

Description of problem:

Under some circumstances, tuned_params will duplicated show in kernel line. This may confuse people.


Version-Release number of selected component (if applicable):
4.18.0-193.rt13.51.el8.x86_64
tuned-2.13.0-6.el8.noarch


How reproducible:
100%


Steps to Reproduce:
1. Apply profile realtime-virtual-guest in guest

# cat /etc/tuned/realtime-virtual-guest-variables.conf 
isolated_cores=1,2,3,4
isolate_managed_irq=Y

# tuned-adm profile realtime-virtual-guest

2. Reboot guest, the isolation info shows expected in kernel line.

# cat /proc/cmdline 
BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-193.rt13.51.el8.x86_64 root=/dev/mapper/rhel_vm--73--196-root ro console=tty0 console=ttyS0,115200n8 biosdevname=0 crashkernel=auto resume=/dev/mapper/rhel_vm--73--196-swap rd.lvm.lv=rhel_vm-73-196/root rd.lvm.lv=rhel_vm-73-196/swap skew_tick=1 isolcpus=managed_irq,domain,1,2,3,4 intel_pstate=disable nosoftlockup tsc=nowatchdog nohz=on nohz_full=1,2,3,4 rcu_nocbs=1,2,3,4

3. Manually change kernel line. Append "default_hugepagesz=1G" to kernel line.

# grubby --args="default_hugepagesz=1G" --update-kernel=`grubby --default-kernel`

4. Switch to another profile 

# tuned-adm profile desktop

5. Go back to profile realtime-virtual-guest again.

# tuned-adm profile realtime-virtual-guest

6. Reboot RT guest

7. Check kernel line, the isolated info is duplicated show.

# cat /proc/cmdline 
BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-193.rt13.51.el8.x86_64 root=/dev/mapper/rhel_vm--73--196-root ro console=tty0 console=ttyS0,115200n8 biosdevname=0 crashkernel=auto resume=/dev/mapper/rhel_vm--73--196-swap rd.lvm.lv=rhel_vm-73-196/root rd.lvm.lv=rhel_vm-73-196/swap skew_tick=1 isolcpus=managed_irq,domain,1,2,3,4 intel_pstate=disable nosoftlockup tsc=nowatchdog nohz=on nohz_full=1,2,3,4 rcu_nocbs=1,2,3,4 default_hugepagesz=1G skew_tick=1 isolcpus=managed_irq,domain,1,2,3,4 intel_pstate=disable nosoftlockup tsc=nowatchdog nohz=on nohz_full=1,2,3,4 rcu_nocbs=1,2,3,4


Actual results:
Tuned_params is duplicated show in kernel line. 

Expected results:
Tuned_params should only show one info of current profile.

Additional info:

Comment 1 Jaroslav Škarvada 2020-04-01 17:55:20 UTC

Please try with
grubby-8.40-38.el8

and report results.

Comment 2 Pei Zhang 2020-04-02 07:06:31 UTC

(In reply to Jaroslav Škarvada from comment #1)
> Please try with
> grubby-8.40-38.el8
> 
> and report results.

Hi Jaroslav,

We were testing with grubby-8.40-38.el8.x86_64 in above testing. So with grubby-8.40-38.el8, we can hit this duplicate issue. 

Best regards,

Pei

Comment 4 Pei Zhang 2020-10-12 12:17:41 UTC

This issue still exists with 8.3 testing. After appending or modifying kernel options (like default_hugepagesz=1G or default_hugepagesz=2M), then rebooting os will cause isolated info repeatedly show. Just like below.

# cat /proc/cmdline 
BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-240.el8.x86_64 root=/dev/mapper/rhel_dell--per740--02-root ro crashkernel=auto resume=/dev/mapper/rhel_dell--per740--02-swap rd.lvm.lv=rhel_dell-per740-02/root rd.lvm.lv=rhel_dell-per740-02/swap console=ttyS0,115200n81 skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=000002ab intel_pstate=disable nosoftlockup iommu=pt intel_iommu=on pci=realloc skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=000002ab intel_pstate=disable nosoftlockup skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=000002ab intel_pstate=disable nosoftlockup skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=000002ab intel_pstate=disable nosoftlockup skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=000002ab intel_pstate=disable nosoftlockup default_hugepagesz=1G skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=000002ab intel_pstate=disable nosoftlockup


Versions:
4.18.0-240.el8.x86_64
tuned-2.14.0-3.el8.noarch
grubby-8.40-41.el8.x86_64

Comment 5 Luiz Capitulino 2020-10-15 03:44:07 UTC

Pei,

Can we assume this issue exists on 8.2.z and 8.4 as well?

Comment 6 Pei Zhang 2020-10-15 04:07:11 UTC

(In reply to Luiz Capitulino from comment #5)
> Pei,
> 
> Can we assume this issue exists on 8.2.z and 8.4 as well?

Luiz,

This issue exists on 8.2.z.

I don't start 8.4 testing yet, but I think it should exist on 8.4 as well.

Besides, rhel7.9 doesn't hit this issue.

Best regards,

Pei

Comment 17 Pei Zhang 2021-03-12 02:12:46 UTC

Testing update:

This issue still exists with latest rhel8.4.

Versions:
grubby-8.40-41.el8.x86_64
4.18.0-296.el8.x86_64
tuned-2.15.0-2.el8.noarch


# cat /proc/cmdline 
BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-296.el8.x86_64 root=/dev/mapper/rhel_dell--per740--02-root ro crashkernel=auto resume=/dev/mapper/rhel_dell--per740--02-swap rd.lvm.lv=rhel_dell-per740-02/root rd.lvm.lv=rhel_dell-per740-02/swap console=ttyS0,115200n81 skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=ffffffff,000002ab intel_pstate=disable nosoftlockup iommu=pt intel_iommu=on pci=realloc skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=ffffffff,000002ab intel_pstate=disable nosoftlockup skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=ffffffff,000002ab intel_pstate=disable nosoftlockup skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=ffffffff,000002ab intel_pstate=disable nosoftlockup skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=ffffffff,000002ab intel_pstate=disable nosoftlockup default_hugepagesz=1G skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=ffffffff,000002ab intel_pstate=disable nosoftlockup

Comment 19 Pei Zhang 2021-06-03 04:06:35 UTC

Testing update:
This issue still exists in rhel8.5.

Version:
grubby-8.40-41.el8.x86_64

BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-310.rt7.91.el8.x86_64 root=/dev/mapper/rhel_dell--per430--10-root ro crashkernel=auto resume=/dev/mapper/rhel_dell--per430--10-swap rd.lvm.lv=rhel_dell-per430-10/root rd.lvm.lv=rhel_dell-per430-10/swap console=ttyS0,115200n81 skew_tick=1 isolcpus=managed_irq,domain,1,3,5,7,9,11,13,15,17,19,12,14,16,18 intel_pstate=disable nosoftlockup tsc=nowatchdog nohz=on nohz_full=1,3,5,7,9,11,13,15,17,19,12,14,16,18 rcu_nocbs=1,3,5,7,9,11,13,15,17,19,12,14,16,18 iommu=pt intel_iommu=on default_hugepagesz=1G skew_tick=1 isolcpus=managed_irq,domain,1,3,5,7,9,11,13,15,17,19,12,14,16,18 intel_pstate=disable nosoftlockup tsc=nowatchdog nohz=on nohz_full=1,3,5,7,9,11,13,15,17,19,12,14,16,18 rcu_nocbs=1,3,5,7,9,11,13,15,17,19,12,14,16,18


BOOT_IMAGE=(hd0,msdos2)/vmlinuz-4.18.0-309.el8.x86_64 root=/dev/mapper/rhel_dell--per740--02-root ro crashkernel=auto resume=/dev/mapper/rhel_dell--per740--02-swap rd.lvm.lv=rhel_dell-per740-02/root rd.lvm.lv=rhel_dell-per740-02/swap console=ttyS0,115200n81 skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=000002ab intel_pstate=disable nosoftlockup iommu=pt intel_iommu=on pci=realloc skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=000002ab intel_pstate=disable nosoftlockup skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=000002ab intel_pstate=disable nosoftlockup skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=000002ab intel_pstate=disable nosoftlockup skew_tick=1 nohz=on nohz_full=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,31,29,27,25,23,21,19,17,15,13,11 tuned.non_isolcpus=000002ab intel_pstate=disable nosoftlockup default_hugepagesz=1G

Comment 23 Pei Zhang 2021-06-15 14:00:04 UTC

Thank you Javier, Petr, Jared for the efforts to fix this issue. 


Testing update:

This issue has gone with grubby-8.40-42.el8.x86_64. No duplication tuned info any more.

# cat /proc/cmdline 
BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-312.el8.x86_64 root=/dev/mapper/rhel_vm--73--150-root ro console=tty0 console=ttyS0,115200n8 biosdevname=0 crashkernel=auto resume=/dev/mapper/rhel_vm--73--150-swap rd.lvm.lv=rhel_vm-73-150/root rd.lvm.lv=rhel_vm-73-150/swap skew_tick=1 nohz=on nohz_full=1 rcu_nocbs=1 tuned.non_isolcpus=0000003d intel_pstate=disable nosoftlockup iommu=pt intel_iommu=on default_hugepagesz=2M

# cat /proc/cmdline 
BOOT_IMAGE=(hd0,gpt2)/vmlinuz-4.18.0-311.rt7.92.el8.x86_64 root=/dev/mapper/rhel_dell--per430--11-root ro crashkernel=auto resume=/dev/mapper/rhel_dell--per430--11-swap rd.lvm.lv=rhel_dell-per430-11/root rd.lvm.lv=rhel_dell-per430-11/swap console=ttyS0,115200n81 skew_tick=1 isolcpus=managed_irq,domain,1,3,5,7,9,11,13,15,17,19,12,14,16,18 intel_pstate=disable nosoftlockup tsc=nowatchdog nohz=on nohz_full=1,3,5,7,9,11,13,15,17,19,12,14,16,18 rcu_nocbs=1,3,5,7,9,11,13,15,17,19,12,14,16,18 iommu=pt intel_iommu=on default_hugepagesz=2M

Comment 24 Luiz Capitulino 2021-06-16 20:16:23 UTC

Pei,

Does this affect 8.4.z and maybe 8.2.z?

If yes, Javier, should we consider the backport? Those z-streams are EUS, they have a long lifecycle support for Telco companies (who could be affected by this issue).

Comment 25 Javier Martinez Canillas 2021-06-16 20:23:32 UTC

(In reply to Luiz Capitulino from comment #24)
> Pei,
> 
> Does this affect 8.4.z and maybe 8.2.z?
> 
> If yes, Javier, should we consider the backport? Those z-streams are EUS,
> they have a long lifecycle support for Telco companies (who could be
> affected by this issue).

Yes, let's create z-stream clones for this.

Comment 28 Pei Zhang 2021-06-17 01:14:45 UTC

(In reply to Luiz Capitulino from comment #24)
> Pei,
> 
> Does this affect 8.4.z and maybe 8.2.z?

Luiz, 

Yes, this affect both 8.4.z and 8.2.z. Thanks.

Comment 39 errata-xmlrpc 2021-11-09 20:05:06 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 (grubby bug fix and enhancement update), 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-2021:4509