Hi Guilherme, Sure. I'll send my sosreport later.
However, I believe this problem is not related with my hardware because this problem also occurs 3 different machines. * Advantec EPC-U2117 * Virtual Machine on VMware ESXi * UPS-APLX7-A20-0464 I write the procedure to find this problem. 1. Install 'Ubuntu server 18.04'. 2. Install 'kdump-tools' $ sudo apt install kdump-tools 3. create key and import after rebooting, the kdump kernel will enable when the secureboot is disabled. However, the kdump kernel will blocked regardless of the version of kernel. So I need to run these commands according to this. https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1840941 $ sudo openssl x509 -outform der -in /etc/ssl/certs/ca-certificates.crt -out new-ca.der $ sudo mokutil --import new-ca.der Inputing password will be required. 4. Reboot After rebooting, MOK management interface will be shown. Type Enter and select Enroll MOK > Yes, then input the password, then reboot 5. Check whether kdump-tools works or not. $ sudo systemctl status kdump-tools Using kernel 4.15.0-64: ● kdump-tools.service - Kernel crash dump capture service Loaded: loaded (/lib/systemd/system/kdump-tools.service; enabled; vendor preset: enabled) Active: active (exited) since Tue 2020-04-07 17:38:53 UTC; 41s ago Process: 878 ExecStart=/etc/init.d/kdump-tools start (code=exited, status=0/SUCCESS) Main PID: 878 (code=exited, status=0/SUCCESS) Apr 07 17:38:51 advanced systemd[1]: Starting Kernel crash dump capture service... Apr 07 17:38:52 advanced kdump-tools[878]: Starting kdump-tools: * Creating symlink /var/lib/kdump/vmlinuz Apr 07 17:38:52 advanced kdump-tools[878]: * Creating symlink /var/lib/kdump/initrd.img Apr 07 17:38:52 advanced kdump-tools[878]: * loaded kdump kernel Apr 07 17:38:52 advanced kdump-tools[1029]: loaded kdump kernel Apr 07 17:38:53 advanced systemd[1]: Started Kernel crash dump capture service. Using kernel 4.15.0-76: ● kdump-tools.service - Kernel crash dump capture service Loaded: loaded (/lib/systemd/system/kdump-tools.service; enabled; vendor preset: enabled) Active: active (exited) since Tue 2020-04-07 16:59:01 UTC; 25min ago Main PID: 889 (code=exited, status=0/SUCCESS) Tasks: 0 (limit: 4915) CGroup: /system.slice/kdump-tools.service Apr 07 16:58:42 advanced systemd[1]: Starting Kernel crash dump capture service... Apr 07 16:58:43 advanced kdump-tools[889]: Starting kdump-tools: * Creating symlink /var/lib/kdump/vmlinuz Apr 07 16:58:43 advanced kdump-tools[889]: kdump-tools: Generating /var/lib/kdump/initrd.img-4.15.0-76-lowlatency Apr 07 16:59:01 advanced kdump-tools[889]: * Creating symlink /var/lib/kdump/initrd.img Apr 07 16:59:01 advanced kdump-tools[889]: kexec_file_load failed: Exec format error Apr 07 16:59:01 advanced kdump-tools[889]: * failed to load kdump kernel Apr 07 16:59:01 advanced systemd[1]: Started Kernel crash dump capture service. -- 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
