EOL
** Changed in: kdump-tools (Ubuntu Impish)
Status: New => Invalid
** Changed in: kdump-tools (Ubuntu Impish)
Assignee: Heather Lemon (hypothetical-lemon) => (unassigned)
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https://bugs.launchpad.net/bugs/1978333
Title:
Remove "ata_piix.prefer_ms_hyperv=0" parameter
Status in kdump-tools package in Ubuntu:
Fix Committed
Status in makedumpfile package in Ubuntu:
Invalid
Status in kdump-tools source package in Bionic:
Invalid
Status in makedumpfile source package in Bionic:
New
Status in kdump-tools source package in Focal:
Invalid
Status in makedumpfile source package in Focal:
New
Status in kdump-tools source package in Impish:
Invalid
Status in makedumpfile source package in Impish:
Invalid
Status in kdump-tools source package in Jammy:
Incomplete
Status in makedumpfile source package in Jammy:
Invalid
Status in kdump-tools source package in Kinetic:
Fix Committed
Status in makedumpfile source package in Kinetic:
Invalid
Bug description:
[Impact]
Azure VM instances hit I/O error on boot causing kernel crash
[Test Plan]
Create VM on Azure
Install crash dump utilies (from guide:
https://ubuntu.com/server/docs/kernel-crash-dump)
sudo apt install linux-crashdump
Say (y) to all questions during install
Reboot the VM
As root on the VM after reboot:
kdump-config show
DUMP_MODE: kdump
USE_KDUMP: 1
KDUMP_SYSCTL: kernel.panic_on_oops=1
KDUMP_COREDIR: /var/crash
crashkernel addr: 0x
/var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-5.4.0-1085-azure
kdump initrd:
/var/lib/kdump/initrd.img: symbolic link to
/var/lib/kdump/initrd.img-5.4.0-1085-azure
current state: ready to kdump
kexec command:
/sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-5.4.0-1085-azure
root=UUID=a117a689-aa1d-4cdc-8a30-7b9fbf174437 ro console=tty1 console=ttyS0
earlyprintk=ttyS0 reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1
irqpoll nousb ata_piix.prefer_ms_hyperv=0" --initrd=/var/lib/kdump/initrd.img
/var/lib/kdump/vmlinuz
#verify kdump is on
cat /proc/cmdline
... crashkernel=512M-:192M
dmesg | grep -i crash
[ 0.071660] kexec: Reserving the low 1M of memory for crashkernel
[ 0.269823] Reserving 192MB of memory at 640MB for crashkernel (System
RAM: 4095MB)
cat /proc/sys/kernel/sysrq
# make sure this value is greater than 0
#set it to 1
sudo sysctl -w kernel.sysrq=1
Outcome with "ata_piix.prefer_ms_hyperv=0" in kexec command:
# perform crash
sudo su
echo c > /proc/sysrq-trigger
#kdump doesnt work and hangs indefinitely
#force reboot VM from Azure console
Outcome after removing "ata_piix.prefer_ms_hyperv=0" in kexec command:
# perform crash
sudo su
echo c > /proc/sysrq-trigger
#kdump works, VM eventually (several minutes) reboots
# Login to VM and check that there is a core file in /var/crash:
ls /var/crash
[Where Problems Could Occur]
This change modifies the debian/rules.
The package could fail to build properly if mistyped.
[Other]
Back-porting a fix from upstream to remove "ata_piix.prefer_ms_hyperv=0"
parameter.
target series - Kinetic -> Bionic
upstream patch
https://salsa.debian.org/debian/kdump-
tools/-/commit/b1bac9396ddbbce3817c34be3161630698e4a503
*Note: There are two source packages needed changes, kdump-tools for
Impish -> Kinetic and makedumpfile for series Focal -> Bionic
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