This is *not* fixed for Xenial. I had originally applied the workaround
in the bug description to get my computer to boot again. After seeing a
"fixed" status for this bug, I updated intel-microcode. After I
rebooted, my computer would not boot to the kernel which had the
microcode applied (4.4.0-122). It would only boot to the previous kernel
without the microcode (4.4.0-119).
$ tail -n 5 /var/log/apt/history.log
Start-Date: 2018-05-05 06:06:43
Commandline: apt install intel-microcode
Upgrade: intel-microcode:amd64 (3.20180108.0+really20170707ubuntu16.04.1,
3.20180312.0~ubuntu16.04.1)
End-Date: 2018-05-05 06:06:57
$ uname -a
Linux thinkpad 4.4.0-119-generic #143-Ubuntu SMP Mon Apr 2 16:08:24 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux
$ dpkg -l | grep linux-image-4 | grep ^i
ii linux-image-4.4.0-112-generic 4.4.0-112.135
amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP
ii linux-image-4.4.0-119-generic 4.4.0-119.143
amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP
ii linux-image-4.4.0-122-generic 4.4.0-122.146
amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Codename: xenial
$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 58
model name : Intel(R) Core(TM) i5-3317U CPU @ 1.70GHz
stepping : 9
microcode : 0x1c
cpu MHz : 893.761
cache size : 3072 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm
constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc
aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16
xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx
f16c rdrand lahf_lm epb retpoline kaiser tpr_shadow vnmi flexpriority ept vpid
fsgsbase smep erms xsaveopt dtherm ida arat pln pts
bugs : cpu_meltdown spectre_v1 spectre_v2
bogomips : 3391.94
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1759920
Title:
intel-microcode 3.20180312.0 causes lockup at login screen
Status in intel-microcode package in Ubuntu:
Invalid
Status in linux package in Ubuntu:
Invalid
Status in intel-microcode source package in Trusty:
Invalid
Status in linux source package in Trusty:
Fix Released
Status in intel-microcode source package in Xenial:
Invalid
Status in linux source package in Xenial:
Fix Released
Status in intel-microcode source package in Artful:
Invalid
Status in linux source package in Artful:
Fix Released
Bug description:
[Impact]
* Some systems experience kernel lockups after updating to the latest
intel-microcode
package or when receiving updated microcode from a BIOS update.
* In many cases, the lockups occur before users can reach the login screen
which makes
it very difficult to debug/workaround.
[Test Case]
* The most reliable test case currently known is to install the sssd
package. Lockups
may occur during package installation (disable IBPB by writing 0 to
/proc/sys/kernel/ibpb_enabled to prevent this from happening). A lockup
will most
likely occur just after booting the system up as the lock screen is
displayed.
[Regression Potential]
* The fix is in the task switching code of the kernel so complexity of the
change is
relatively high.
[Original Report]
I don't know if this is a problem with the kernel or the microcode,
but we have a significant number of computers in our organization (on
both 16.04 and 17.10) that fail if they have both updated. Booting
with either linux-image-4.13.0-36-generic or intel-microcode
3.20180108.0+really20170707ubuntu17.10.1 allows all these computers to
boot.
## Workaround ##
1. Boot the system with the dis_ucode_ldr kernel boot parameter to temporary
avoid the problem:
https://wiki.ubuntu.com/Kernel/KernelBootParameters
2. Install the previous version of package from
https://launchpad.net/~ubuntu-security-proposed/+archive/ubuntu/ppa/+build/14261530/+files/intel-microcode_3.20180108.0+really20170707ubuntu16.04.1_amd64.deb
3. (Optional) Hold the package so that it won't be upgraded accidentally
sudo apt-mark hold intel-microcode
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1759920/+subscriptions
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