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Bug 1739286

Summary: kernel.spec: Old kernel bootloader entries are left after removing old kernel packages
Product: Red Hat Enterprise Linux 8 Reporter: Ian Wienand <iwienand>
Component: kernelAssignee: Prarit Bhargava <prarit>
kernel sub component: Other QA Contact: Red Hat Kernel QE team <kernel-qe>
Status: CLOSED WORKSFORME Docs Contact:
Severity: unspecified    
Priority: unspecified CC: nhorman
Version: 8.0Flags: pm-rhel: mirror+
Target Milestone: rc   
Target Release: 8.0   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-09-10 14:24:47 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:

Description Ian Wienand 2019-08-09 00:53:43 UTC 
Description of problem:

After uninstalling original kernel packages, boot entries are left in /boot/loader/entries

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

Tested with ./rhel-8.0-update-1-x86_64-kvm.qcow2

Steps to Reproduce:

1. boot above image; entries for the active kernel are present.

---
[root@rhl8-test cloud-user]# ls /boot/loader/entries
e1b088c6ab1348649040e16d35eebe6b-0-rescue.conf  
1b088c6ab1348649040e16d35eebe6b-4.18.0-80.4.2.el8_0.x86_64.conf
---

2. upgrade kernel; new entries are present (but with the machine-id of the host now)

---
$ dnf install kernel
...
  Verifying        : linux-firmware-20190111-92.gitd9fb2ee6.el8.noarch
  Verifying        : kernel-4.18.0-80.7.2.el8_0.x86_64
  Verifying        : kernel-modules-4.18.0-80.7.2.el8_0.x86_64
  Verifying        : kernel-core-4.18.0-80.7.2.el8_0.x86_64
---

---
[root@rhl8-test cloud-user]# ls -l /boot/loader/entries
total 16
-rw-r--r--. 1 root root 408 Jun 18 13:08 e1b088c6ab1348649040e16d35eebe6b-0-rescue.conf
-rw-r--r--. 1 root root 371 Jun 18 13:08 e1b088c6ab1348649040e16d35eebe6b-4.18.0-80.4.2.el8_0.x86_64.conf
-rw-r--r--. 1 root root 408 Aug  8 20:29 fbe7f11dbeb44acaac82560ee97c0414-0-rescue.conf
-rw-r--r--. 1 root root 371 Aug  8 20:29 fbe7f11dbeb44acaac82560ee97c0414-4.18.0-80.7.2.el8_0.x86_64.conf
---

3. reboot to get new kernel going

4. remove old kernel(s)

---
[root@rhl8-test cloud-user]# dnf remove kernel-0:4.18.0-80.4.2.el8_0.x86_64 kernel-core-0:4.18.0-80.4.2.el8_0.x86_64 kernel-modules-0:4.18.0-80.4.2.el8_0.x86_64
...
Running transaction
...
Erasing          : kernel-4.18.0-80.4.2.el8_0.x86_64                                                                                                                                                                                                   Erasing          : kernel-modules-4.18.0-80.4.2.el8_0.x86_64                                                                                                                                                                                           Erasing          : kernel-core-4.18.0-80.4.2.el8_0.x86_64                                                                                                                                                                                            
...
Complete!
---

5. Old bootloader entries remain despite the kernel being removed

---
[root@rhl8-test cloud-user]# ls -l /boot/loader/entries
total 16
-rw-r--r--. 1 root root 408 Jun 18 13:08 e1b088c6ab1348649040e16d35eebe6b-0-rescue.conf
-rw-r--r--. 1 root root 371 Jun 18 13:08 e1b088c6ab1348649040e16d35eebe6b-4.18.0-80.4.2.el8_0.x86_64.conf
-rw-r--r--. 1 root root 408 Aug  8 20:29 fbe7f11dbeb44acaac82560ee97c0414-0-rescue.conf
-rw-r--r--. 1 root root 371 Aug  8 20:29 fbe7f11dbeb44acaac82560ee97c0414-4.18.0-80.7.2.el8_0.x86_64.conf
---

Expected results:

Only the available kernels are listed there


Additional info:

I can only presume this is because the machine-id on the .qcow2 image is re-generated, and the uninstall scripts don't want to touch bootloader entries that don't match the current machine-id.  But then this also means that grub has invalid entries in the boot menu.

I'm not really sure if this is a kernel problem, or a systemd problem (if that owns the install scripts), or perhaps an image generation problem.
Comment 2 Prarit Bhargava 2020-09-10 14:24:47 UTC 
Going back through some older bugs.  It looks like we fixed this at some point:

[10:08 AM root@intel-whitley-03 rhel]# rhget -i kernel-4.18.0-231.el8
installing ... Verifying...                                                     ################################# [100%]
Preparing...                          ################################# [100%]
Updating / installing...
   1:kernel-core-4.18.0-231.el8       ################################# [ 33%]
   2:kernel-modules-4.18.0-231.el8    ################################# [ 67%]
   3:kernel-4.18.0-231.el8            ################################# [100%]
[10:08 AM root@intel-whitley-03 rhel]# rhget -i kernel-4.18.0-232.el8
installing ... Verifying...                                                     ################################# [100%]
Preparing...                          ################################# [100%]
Updating / installing...
   1:kernel-core-4.18.0-232.el8       ################################# [ 33%]
   2:kernel-modules-4.18.0-232.el8    ################################# [ 67%]
   3:kernel-4.18.0-232.el8            ################################# [100%]
[10:12 AM root@intel-whitley-03 rhel]# rhget -i kernel-4.18.0-233.el8
installing ... Verifying...                                                     ################################# [100%]
Preparing...                          ################################# [100%]
Updating / installing...
   1:kernel-core-4.18.0-233.el8       ################################# [ 33%]
   2:kernel-modules-4.18.0-233.el8    ################################# [ 67%]
   3:kernel-4.18.0-233.el8            ################################# [100%]
[10:16 AM root@intel-whitley-03 ~]# cd /boot/loader/entries/
[10:17 AM root@intel-whitley-03 entries]# ls
23fda7f6dca049b0892e0647df33aeed-0-rescue.conf
23fda7f6dca049b0892e0647df33aeed-4.18.0-231.el8.x86_64.conf
23fda7f6dca049b0892e0647df33aeed-4.18.0-232.el8.x86_64.conf
23fda7f6dca049b0892e0647df33aeed-4.18.0-233.el8.x86_64.conf
23fda7f6dca049b0892e0647df33aeed-4.18.0-234.el8.x86_64.conf
[10:17 AM root@intel-whitley-03 rhel]# rpm -e kernel-core-4.18.0-231.el8 kernel-modules-4.18.0-231.el8 kernel-4.18.0-231.el8
[10:17 AM root@intel-whitley-03 rhel]# 
[10:17 AM root@intel-whitley-03 entries]# ls
23fda7f6dca049b0892e0647df33aeed-0-rescue.conf
23fda7f6dca049b0892e0647df33aeed-4.18.0-232.el8.x86_64.conf
23fda7f6dca049b0892e0647df33aeed-4.18.0-233.el8.x86_64.conf
23fda7f6dca049b0892e0647df33aeed-4.18.0-234.el8.x86_64.conf

so there is no longer a -231 /boot/loader/entries conf file.

P.