Public bug reported:
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 ctrl-edgen systemd[1]: Starting Kernel crash dump capture
service...
Mar 25 13:39:02 ctrl-edgen kdump-tools[832]: Starting kdump-tools: * Creating
symlink /var/lib/kdump/vmlinuz
Mar 25 13:39:02 ctrl-edgen kdump-tools[832]: * Creating symlink
/var/lib/kdump/initrd.img
Mar 25 13:39:03 ctrl-edgen kdump-tools[832]: * loaded kdump kernel
Mar 25 13:39:03 ctrl-edgen kdump-tools[938]: loaded kdump kernel
Mar 25 13:39:03 ctrl-edgen systemd[1]: Started Kernel crash dump capture
service.
** Affects: makedumpfile (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
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)
+ 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
+ $ 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.
+ 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
+ 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 ctrl-edgen systemd[1]: Starting Kernel crash dump capture
service...
Mar 25 13:39:02 ctrl-edgen kdump-tools[832]: Starting kdump-tools: *
Creating symlink /var/lib/kdump/vmlinuz
Mar 25 13:39:02 ctrl-edgen kdump-tools[832]: * Creating symlink
/var/lib/kdump/initrd.img
Mar 25 13:39:03 ctrl-edgen kdump-tools[832]: * loaded kdump kernel
Mar 25 13:39:03 ctrl-edgen kdump-tools[938]: loaded kdump kernel
Mar 25 13:39:03 ctrl-edgen systemd[1]: Started Kernel crash dump capture
service.
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https://bugs.launchpad.net/bugs/1869672
Title:
kdump kernel can't be loaded using kernel 4.15.0-76
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