On Fri, Feb 12, 2016 at 11:12:34AM +0100, Sebastian Ott wrote:

On Fri, 12 Feb 2016, Will Deacon wrote:

quoted

On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote:

quoted

On Thu, 11 Feb 2016 21:09:42 +0200
"Kirill A. Shutemov" [off-list ref] wrote:

quoted

On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote:

quoted

Sebastian Ott reported random kernel crashes beginning with v4.5-rc1 and
he also bisected this to commit 61f5d698 "mm: re-enable THP". Further
review of the THP rework patches, which cannot be bisected, revealed
commit fecffad "s390, thp: remove infrastructure for handling splitting PMDs"
(and also similar commits for other archs).

[...]

quoted

Do you have a reliable way to trigger the "random kernel crashes"? We've not
seen anything reported on arm64, but I don't see why we wouldn't be affected
by the same bug and it would be good to confirm and validate a fix.

My testcase was compiling the kernel. Most of the time my test system
didn't survive a single compile run. During bisect I did at least 20
compile runs to flag a commit as good.

I've been building kernels all day with -rc3 on my arm64 box and haven't
seen any problems yet.. :/.

I'll leave it going over the weekend.

Will