Hello,
Last week we had a kernel crash during a kernel update. We are using UEFI with Proxmox VE 6.4-13 with zfs root partition, but we are unable to capture the kernel crash. The steps we followed can be found below.
1. Install kdump-tools:
2. Since we are using ZFS we need to fix those issues. Fix issue with ZFS on / partition and initramfs generation (source):
3. Finish installation:
4. Configure bootloader: First you will need to find out which bootloader you're using:
systemd-boot
We appended the following values "crashkernel=384M-:256M nmi_watchdog=1"
Output
5. Apply bootloader changes:
6. Reboot
7. Show kernel commandline:
Output
8.Show kdump status:
Output
9. When we simulate a crash with the following commands:
A crash happens after this but we are unable to capture this crash. We see this on our console
Last week we had a kernel crash during a kernel update. We are using UEFI with Proxmox VE 6.4-13 with zfs root partition, but we are unable to capture the kernel crash. The steps we followed can be found below.
1. Install kdump-tools:
Code:
echo "kexec-tools kexec-tools/load_kexec boolean false" | debconf-set-selections
echo "kdump-tools kdump-tools/use_kdump boolean true" | debconf-set-selections
DEBIAN_FRONTEND=noninteractive apt -y install kdump-tools2. Since we are using ZFS we need to fix those issues. Fix issue with ZFS on / partition and initramfs generation (source):
Code:
sed -i "s|^\(sed -e 's/MODULES=\.\*/MODULES=dep/'\)|#\1|g" /etc/kernel/postinst.d/kdump-tools3. Finish installation:
Code:
apt -f install4. Configure bootloader: First you will need to find out which bootloader you're using:
Code:
proxmox-boot-tool status
Code:
Output
Re-executing '/usr/sbin/proxmox-boot-tool' in new private mount namespace..
System currently booted with uefi
CEBB-ACE6 is configured with: uefi (versions: 5.4.106-1-pve, 5.4.174-2-pve)
CEBC-0075 is configured with: uefi (versions: 5.4.106-1-pve, 5.4.174-2-pve)systemd-boot
We appended the following values "crashkernel=384M-:256M nmi_watchdog=1"
Code:
cat /etc/kernel/cmdline
Code:
root=ZFS=rpool/ROOT/pve-1 boot=zfs crashkernel=384M-:768M nmi_watchdog=15. Apply bootloader changes:
Code:
proxmox-boot-tool refresh7. Show kernel commandline:
Code:
cat /proc/cmdline
Code:
initrd=\EFI\proxmox\5.4.174-2-pve\initrd.img-5.4.174-2-pve root=ZFS=rpool/ROOT/pve-1 boot=zfs crashkernel=384M-:768M nmi_watchdog=18.Show kdump status:
Code:
kdump-config status
Code:
current state : ready to kdump9. When we simulate a crash with the following commands:
Code:
echo 1 > /proc/sys/kernel/sysrq
echo c > /proc/sysrq-triggerA crash happens after this but we are unable to capture this crash. We see this on our console