This can be a good start:
https://www.kernel.org/doc/html/latest/process/submitting-patches.html
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https://bugs.launchpad.net/bugs/1830951
Title:
kernel panic: stack
Hi Kai-Heng,
Indeed, it should be <=1, btw, do you want me to follow the kernel dev
process to send the patch to upstream maintainer, or do you want a patch
uploaded here?
I'm unfamiliar with the process, but I think I can find out if there isn't
any guidelines.
Thanks,
Steven
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You
Hi Steven,
I've checked the code and I think you are right, the case doesn't get handled.
It should abort when there's no name.
a) Will you upstream the patch with proper commit message?
b) I think it should be "if (limit <= 1)" since it's a NULL terminated string.
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@cypressyew, I cannot have proof that the same issue occurred with v5.2 rc2
from your link, as the kernel does not respond to earlyprintk=efi, but it died
pretty much the same way, and no logs were produced.
As I mentioned earlier, the fix in efi.c is a clear indication of a bug in the
kernel
Status change as per request in comment #25
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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Title:
kernel
Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.2-rc2/
If mainline kernel doesn't fix the issue, we need to do a kernel
bisection between v4.4 and v4.15.
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I recompiled the 4.18.0-20-general kernel and made the following
changes, and things start to work.
258c258,261
<
---
> if (limit < 1) {
> pr_err("efi: Invalid name size %ld/%d.\n", name_size, limit);
> return 0;
> }
Logs proving the fix worked:
[
** Attachment added: "lspci-vvnn"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830951/+attachment/5267456/+files/lspci-vvnn.log
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** Attachment added: "version captured with kernel 4.4"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830951/+attachment/5267454/+files/version.log
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We cannot find any logs in var/log related to the failed boots, tried
grepping the kernel version, journalctl --list-boots
** Attachment added: "dmesg after booted with 4.4"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830951/+attachment/5267457/+files/dmesg.log
** Tags added:
** Attachment added: "uname-a"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830951/+attachment/5267455/+files/uname-a.log
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** Attachment added: "Boot-info output"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830951/+attachment/5267453/+files/Boot-Info_20190529_1257.txt
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** Attachment added: "screen capture of the kernel panic backtrace"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830951/+attachment/5267449/+files/IMG_0004.JPG
** Attachment removed: "boot-info output"
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