Hi yamato, thank you! Good news, this time the fix is working and I was
able to kdump in my secureboot system. So, I'll move on and change
title/component/description of this LP to proceed with the SRU - I hope
next kernel (after 4.15.0-97) will have the fix =)
In order to test the kernel, you
Excellent!
Of course I'll try your kernel.
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https://bugs.launchpad.net/bugs/1869672
Title:
kdump kernel can't be loaded using kernel 4.15.0-76
To manage notifications about this bug
Hi yamato, I'm sorry but I found yet another issue that I need to take
care in my fix, hopefully by tomorrow I'll have a new test kernel.
Also, I've noticed that in order to test PPA kernels on secure boot
systems, you'll need to enroll the PPA sign key on shim, to make the
kernel bootable - I'll
Hi yamato, thank you for the great report! I think I found the problem -
can you test my fix proposal? It's just a matter of adding the following
PPA to your system and installing the kernel:
launchpad.net/~gpiccoli/+archive/ubuntu/test1869672
You can run the following commands in order to
** Changed in: makedumpfile (Ubuntu)
Status: New => Confirmed
** Also affects: makedumpfile (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: makedumpfile (Ubuntu Bionic)
Status: New => Confirmed
** Changed in: makedumpfile (Ubuntu Bionic)
Status:
Guilherme,
I'm so glad to hear it. Thanks a lot for your effort!
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Title:
kdump kernel can't be loaded using kernel 4.15.0-76
To manage
Hi yamato, I have good news! Managed to reproduce this in a secure boot
guest (after fighting with the keys hehe). There is an hypothesis of
what's going on: one patch that was merged in -65 changed the way flags
are set on purgatory, a piece of code used on kexec process. If we use
kexec in a
Guilherme,
Thank you for your support.
Please feel free to tell me what I can do.
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Title:
kdump kernel can't be loaded using kernel 4.15.0-76
Hi yamato, thanks a lot for your thorough testing and for the sosreport.
I'll try to reproduce here and analyze the sosreport. As soon as I have
news, I'll get back to you.
Cheers,
Guilherme
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First, I'll send sosreport on kernel 4.15.0-64.
** Attachment added: "sosreport on kernel 4.15.0-64."
https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/1869672/+attachment/5348454/+files/sosreport-advanced-kdumpon64-2020-04-07-mhgdfqe.tar.xz
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I'll send the sosreport on kernel 4.15.0-76.
** Attachment added: "sosreport on kernel 4.15.0-76"
https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/1869672/+attachment/5348455/+files/sosreport-advanced-kdumpon76-2020-04-07-jyfwofm.tar.xz
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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.
By the way, I found the new kernel 4.15.0-96 is available.
I also tried, but the problem won't be fixed
4.15.0-45 -> OK
4.15.0-64 -> OK
* 4.15.0-65 -> NG
* 4.15.0-66 -> NG
* 4.15.0-69 -> NG
* 4.15.0-70 -> NG
* 4.15.0-72 -> NG
* 4.15.0-74 -> NG
4.15.0-76 -> NG
4.15.0-88 -> NG
4.15.0-91 -> NG
Hi yamato, thanks a lot for your help! This greatly reduced the search
scope.
There's one more thing I need from you - can you collect a sosreport from your
system?
This way I can try to mimic your system here the best I can.
Thanks in advance,
Guilherme
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Guilherme,
> can you test the in-between kernel versions, so we can narrow down
when the problem was introduced?
Of course!
I have tesed each kernels. Please check the result. It seems that the problem
occurs from 4.15.0-65.
4.15.0-45 -> OK
4.15.0-64 -> OK
* 4.15.0-65 -> NG
* 4.15.0-66 -> NG
*
Hi yamato, thank you for the report and prompt test!
So, I need to setup a guest with secureboot, I don't have it at hand.
Meanwhile, can you test the in-between kernel versions, so we can narrow down
when the problem was introduced?
The versions we had released in Bionic between -64 and -76
Guilherme,,
Thank you for your reply!
> Does your system have secureboot enabled?
Yes.
I confirmed kdump works without secureboot, but we need it.
> Also, can you test in a recent kernel, like 4.15.0-91?
Yes, I also tried to use 4.15.0-91 and the other.
The results:
4.15.0-45 -> OK
Hi yamato, thanks for the bug report! Does your system have secureboot
enabled? Also, can you test in a recent kernel, like 4.15.0-91?
Thanks in advance,
Guilherme
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** 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]
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