Guilherme, > can you test the in-between kernel versions, so we can narrow down when the problem was introduced?
Of course! I have tesed each kernels. Please check the result. It seems that the problem occurs from 4.15.0-65. 4.15.0-45 -> OK 4.15.0-64 -> OK * 4.15.0-65 -> NG * 4.15.0-66 -> NG * 4.15.0-69 -> NG * 4.15.0-70 -> NG * 4.15.0-72 -> NG * 4.15.0-74 -> NG 4.15.0-76 -> NG 4.15.0-88 -> NG 4.15.0-91 -> NG 4.18.0-15 -> OK -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to makedumpfile in Ubuntu. https://bugs.launchpad.net/bugs/1869672 Title: kdump kernel can't be loaded using kernel 4.15.0-76 Status in makedumpfile package in Ubuntu: New Bug description: Thank you for reading this report. This may caused by bugs in kernel, not in kdump. If so, I will report this to kernel team. I need your comment to solve this. [Impact] * Kdump kernel can't be loaded using linux kernel 4.15.0-76. [Environment] Description: Ubuntu 18.04.4 LTS Release: 18.04 uname: Linux ubuntu 4.15.0-76-generic #86-Ubuntu SMP Fri Jan 17 17:24:28 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux Secure boot is enabled. Versions: * kexec-tools/bionic-updates,now 1:2.0.16-1ubuntu1.1 * kdump-tools/bionic-updates,now 1:1.6.5-1ubuntu1~18.04.4 [Test case] 1)After OS booted, run systemctl status kdump-tools shows these messages below: .... ● kdump-tools.service - Kernel crash dump capture service Loaded: loaded (/lib/systemd/system/kdump-tools.service; enabled; vendor preset: enabled) Active: active (exited) since Fri 2020-03-27 16:40:31 JST; 5min ago Process: 895 ExecStart=/etc/init.d/kdump-tools start (code=exited, status=0/SUCCESS) Main PID: 895 (code=exited, status=0/SUCCESS) Mar 27 16:40:31 ubuntu systemd[1]: Starting Kernel crash dump capture service... Mar 27 16:40:31 ubuntu kdump-tools[895]: Starting kdump-tools: * Creating symlink /var/lib/kdump/vmlinuz Mar 27 16:40:31 ubuntu kdump-tools[895]: * Creating symlink /var/lib/kdump/initrd.img Mar 27 16:40:31 ubuntu kdump-tools[895]: kexec_file_load failed: Exec format error Mar 27 16:40:31 ubuntu kdump-tools[895]: * failed to load kdump kernel Mar 27 16:40:31 ubuntu systemd[1]: Started Kernel crash dump capture service. .... 2)Run kexec directly: $ sudo /sbin/kexec -p --command-line="/boot/vmlinuz-4.15.0-76-generic root=UUID=29a89ad8-8923-435e-a88c-aaf5cb379568 ro mce=ignore_ce reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll nousb ata_piix.prefer_ms_hyperv=0" --initrd=/boot/initrd.img-4.15.0-76-generic /boot/vmlinuz-4.15.0-64-generic Then,these messages are shown: Cannot open /proc/kcore: Operation not permitted Cannot read /proc/kcore: Operation not permitted Cannot load /boot/vmlinuz-4.15.0-76-generic On dmesg, these messages are shown: .... [ 538.524718] Lockdown: /proc/kcore is restricted; see man kernel_lockdown.7 .... 3) Changing OS kernel to older one(I used 4.15.0-64), kdump kernel can be loaded. $ sudo systemctl status kdump-tools ● kdump-tools.service - Kernel crash dump capture service Loaded: loaded (/lib/systemd/system/kdump-tools.service; enabled; vendor preset: enabled) Active: active (exited) since Wed 2020-03-25 13:39:03 JST; 5 days ago Main PID: 832 (code=exited, status=0/SUCCESS) Tasks: 0 (limit: 4915) CGroup: /system.slice/kdump-tools.service Mar 25 13:39:02 ubuntu systemd[1]: Starting Kernel crash dump capture service... Mar 25 13:39:02 ubuntu kdump-tools[832]: Starting kdump-tools: * Creating symlink /var/lib/kdump/vmlinuz Mar 25 13:39:02 ubuntu kdump-tools[832]: * Creating symlink /var/lib/kdump/initrd.img Mar 25 13:39:03 ubuntu kdump-tools[832]: * loaded kdump kernel Mar 25 13:39:03 ubuntu kdump-tools[938]: loaded kdump kernel Mar 25 13:39:03 ubuntu systemd[1]: Started Kernel crash dump capture service. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/1869672/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
