Public bug reported:
We have a few 2010 mac pro running 1604 LTS that are just upgraded to Ubuntu
1804 LTS. While they all worked fine with the 1604 LTS and 4.4 kernel, they can
no longer boot with the 4.15.0-50 kernel installed with 1804.
We tried various kernel flags without luck, and
** 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"
apport information
** Attachment added: "ProcEnviron.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267466/+files/ProcEnviron.txt
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** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267468/+files/ProcModules.txt
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** Attachment added: "PulseList.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267469/+files/PulseList.txt
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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: "uname-a"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830951/+attachment/5267455/+files/uname-a.log
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** 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: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267460/+files/CurrentDmesg.txt
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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
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apport information
** Attachment added: "Lsusb.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267463/+files/Lsusb.txt
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** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267462/+files/Lspci.txt
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** Attachment added: "CRDA.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267459/+files/CRDA.txt
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** Attachment added: "AlsaInfo.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267458/+files/AlsaInfo.txt
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** Attachment added: "IwConfig.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267461/+files/IwConfig.txt
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** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267464/+files/ProcCpuinfo.txt
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** Attachment added: "ProcCpuinfoMinimal.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267465/+files/ProcCpuinfoMinimal.txt
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** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267467/+files/ProcInterrupts.txt
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** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267472/+files/WifiSyslog.txt
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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** Attachment added: "RfKill.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267470/+files/RfKill.txt
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** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1830951/+attachment/5267471/+files/UdevDb.txt
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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:
[
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
--
You
@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
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