** Description changed:
+ [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
+ 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
+
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
+ sudo apt-mark hold intel-microcode
** Changed in: intel-microcode (Ubuntu)
Status: Confirmed => Invalid
** Changed in: intel-microcode (Ubuntu Xenial)
Status: Confirmed => Invalid
** Changed in: intel-microcode (Ubuntu Artful)
Status: Confirmed => Invalid
** Also affects: linux (Ubuntu Trusty)
Importance: Undecided
Status: New
** Also affects: intel-microcode (Ubuntu Trusty)
Importance: Undecided
Status: New
** Changed in: intel-microcode (Ubuntu Trusty)
Status: New => Invalid
** Changed in: linux (Ubuntu Trusty)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1759920
Title:
intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux-
image-4.13.0-37-generic)
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