This bug was fixed in the package linux - 5.0.0-23.24
---------------
linux (5.0.0-23.24) disco; urgency=medium
* disco/linux: 5.0.0-23.24 -proposed tracker (LP: #1838271)
* linux hwe i386 kernel 5.0.0-21.22~18.04.1 crashes on Lenovo x220
(LP: #1838115)
- x86/mm: Check for pfn instead of page in vmalloc_sync_one()
- x86/mm: Sync also unmappings in vmalloc_sync_all()
- mm/vmalloc.c: add priority threshold to __purge_vmap_area_lazy()
- mm/vmalloc: Sync unmappings in __purge_vmap_area_lazy()
-- Stefan Bader <stefan.ba...@canonical.com> Mon, 29 Jul 2019 16:49:23
+0200
** Changed in: linux (Ubuntu Disco)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1838115
Title:
linux hwe i386 kernel 5.0.0-21.22~18.04.1 crashes on Lenovo x220
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Bionic:
Confirmed
Status in linux source package in Disco:
Fix Released
Bug description:
== SRU Justification BIONIC HWE, DISCO ==
Installed Bionic 18.04.2 i386 Desktop (using xubuntu) on a Lenovo
x220i and upgraded to proposed. The 5.0.0.22 kernel crashes in various
ways with video corruption being a main visible featured.
The CPU is a i3-2350M CPU, a 64 bit capable CPU, being booted with
EUFI firmware disabled, so using traditional BIOS.
1. Crashes can be just complete hangs, no ability to switch virtual console
2. Crashes may just result in screen turning off, no video and hang and/or
reboot
3. Crashes sometimes allow virtual console. Can see watchdog hang checks
appearing on 1 or more CPUs.
Tried the i386 https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D
kernels:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.0.21/ - same issue
https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.20.17/ - same issue
https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19.61/ - OK
We therefore can conclude:
1. Issue appears between 4.19.61 and 4.20.17
2. Issue is in upstream kernel
3. Issue not a kernel patch per-se (e.g. security fix, ubuntu sauce patch,
etc)
I repeated this with a VM installation and I don't see the issue, so
this probably is a hardware (or firmware?) specific issue.
== Fix ==
Backport wiggle of upstream fix
3f8fd02b1bf1d7ba964485a56f2f4b53ae88c167 ("mm/vmalloc: Sync unmappings
in __purge_vmap_area_lazy()")
== Test ==
Without the fix, i386 xubuntu on various Lenovo platforms crash during
early boot with random video corruption, hangs,lockups or even
reboots.
With the fix, it boots fine.
== Regression Potential ==
Higher than normal as this touches the mm sync and the fix has only
just hit upstream so it has not much of a soak test. Testing with
this shows it fixes a kitten killer breakage, so I think the risk vs
benefit is worth considering
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