Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1804054
Title:
[Hyper-V] kdump is broken on trusty with linux-azure 4.15.0-1032
kernel
Status in linux package in Ubuntu:
Confirmed
Bug description:
While testing linux-azure 4.15.0-1032 kernel from proposed we found
that kdump is no longer working as expected, on trusty only.
Here are some info and versions.
We'll have to verify a few more scenarios with other images and try to
isolate this, but as least the kdump on trusty issue is there.
Also remains to be checked in which release this regression was introduced.
The below can be repro'd on Azure.
On Xenial it works with ubuntu provided latest kexec-tools 2.0.16.
It looks like the kexec might require some patches from upstream as
far as I can tell from the data we have so far.
Distro / kernel: 4.15.0-1032-azure #33~14.04.2-Ubuntu
Package: kdump-tools 1.5.5-2ubuntu1.6
Errors from logs:
kdump-config: failed to load kdump kernel
kernel: [ 230.772409] init: kdump-tools main process (1726) terminated with
status 1
# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.15.0-1032-azure root=x ro console=tty1
console=ttyS0 earlyprintk=ttyS0 rootdelay=300 crashkernel=384M
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This issue looks resolved with the kexec package build from the
official kernel.org kexec repo, on top of 14.04.
kexec-tools 2.0.18
https://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git
# cat /sys/kernel/kexec_*
1
402653184
And kdump core file gets created when running with 1032 kernel.
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