Hangs in libhugetlbfs tests in -next

[Steve Capper]

On 28 January 2015 at 15:24, Mark Brown <broonie at kernel.org> wrote:
> For at least the past couple of days tests of libhugetlbfs have been
> hanging on mustang in the mlock test running ARMv8 defconfig with both
> 32 bit and 64 bit userspace - after the mprotect test (the one before
> it) we get no console output for several hours so it appears that the
> test has deadlocked.  The tail of the log is:
>
> | find_path (2M: 64):   PASS
> | unlinked_fd (2M: 64): PASS
> | readback (2M: 64):    PASS
> | truncate (2M: 64):    PASS
> | shared (2M: 64):      PASS
> | mprotect (2M: 64):    PASS
>
> and then a timeout.
>
> This may be a generic bug but my ability to run these tests on other
> platforms with huge page support using the infrastructure I'm using is
> limited so I've not been able to test elsewhere and confirm.

I've reproduced this on Juno, it looks like hugtlb_fault is being
called repeatedly in the mlock test.

I'll investigate further.

Cheers,
-- 
Steve