== Testing kernel in -proposed ==
The kernel installs and boots fine on the QDF2400 platform.
$ uname -a
Linux awsdp0 4.10.0-28-generic #32-Ubuntu SMP Fri Jun 30 05:33:10 UTC 2017
aarch64 aarch64 aarch64 GNU/Linux
$ apt policy linux-image-4.10.0-28-generic
linux-image-4.10.0-28-generic:
Installed: 4.10.0-28.32
Candidate: 4.10.0-28.32
Version table:
*** 4.10.0-28.32 500
500 http://ports.ubuntu.com/ubuntu-ports zesty-proposed/main arm64
Packages
100 /var/lib/dpkg/status
The testcase needs hwpoison-inject module to run. But it is not enabled
in the Configs by default.
$ sudo ./run_hugepage_overcommit.sh
sysctl: cannot stat /proc/sys/vm/memory_failure_early_kill: No such file or
directory
modprobe: FATAL: Module hwpoison-inject not found in directory
/lib/modules/4.10.0-28-generic
DIE: Failed to load hwpoison-inject module. Abort.
DIE: Failed to load hwpoison-inject module. Abort.
I can confirm that rebuilding the kernel with the hwpoison-inject
module, and running the test, the kernel does not get soft-lockups and
test works as expected.
** Tags removed: verification-needed-zesty
** Tags added: verification-done-zesty
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https://bugs.launchpad.net/bugs/1696165
Title:
[SRU][Zesty] fix soft lockup on overcommited hugepages
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Zesty:
Fix Committed
Bug description:
[Impact]
On failing to migrate a page, soft_offline_huge_page() performs the necessary
update to the hugepage ref-count.
But when !hugepage_migration_supported() , unmap_and_move_hugepage()
also decrements the page ref-count for the hugepage. The combined
behaviour leaves the ref-count in an inconsistent state.
This leads to soft lockups when running the overcommitted hugepage
test from mce-tests suite
[Testing]
Run the mce-test/cases/function/hwpoison/run_hugepage_overcommit.sh and you
should see softlock up if hugepage migration support is not enabled.
[Fix]
upstream commit:
30809f559a0d mm/migrate: fix refcount handling when
!hugepage_migration_supported()
[Regression Potential]
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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1696165/+subscriptions
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