Re: stable-rc 5.4: libhugetlbfs fallocate_stress.sh: Unable to handle kernel paging request at virtual address ffff00006772f000

[Mike Kravetz]

On 5/13/20 11:40 PM, Michal Hocko wrote:
> On Wed 13-05-20 23:11:40, Naresh Kamboju wrote:
>> While running libhugetlbfs fallocate_stress.sh on stable-rc 5.4 branch kernel
>> on arm64 hikey device. The following kernel Internal error: Oops:
>> crash dump noticed.
> 
> Is the same problem reproducible on vanilla 5.4 without any stable
> patches?
> 

Or, an earlier version of 5.4-stable?  Nothing in the changelog for 5.4.41
looks related to this issue.  There was an arm specific hugetlb change
"arm64: hugetlb: avoid potential NULL dereference", but that is pretty
straight forward.

I'm guessing this may not reproduce easily.  To help reproduce, you could
change the
#define FALLOCATE_ITERATIONS 100000
in .../libhugetlbfs/tests/fallocate_stress.c to a larger number to force
the stress test to run longer.
-- 
Mike Kravetz