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From: Steve Capper <steve.capper@linaro.org>
To: Mark Brown <broonie@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Mel Gorman <mgorman@suse.de>,
	linux-next@vger.kernel.org
Subject: Re: Hangs in libhugetlbfs tests in -next
Date: Thu, 29 Jan 2015 16:02:27 +0000	[thread overview]
Message-ID: <CAPvkgC3OLdf7ZgDfAC5R4wgZDirAZAmY+ZsBLQedpjq+HJHACw@mail.gmail.com> (raw)
In-Reply-To: <20150128152412.GX21293@sirena.org.uk>

On 28 January 2015 at 15:24, Mark Brown <broonie@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 bisected this problem down to commit:
f2c0507 mm: remove remaining references to NUMA hinting bits and helpers

Essentially the mlock unit test from libhugetlbfs then fails with
hugetlbf_fault being called in an infinite loop.

After this commit is applied we get the following definition of:
static inline int is_swap_pte(pte_t pte)
{
        return !pte_none(pte);
}

rather than:
static inline int is_swap_pte(pte_t pte)
{
        return !pte_none(pte) && !pte_present_nonuma(pte);
}

(note here that pte_present_nonuma == pte_present on arm64)

I think this is a typo in the patch, as entries should be checked for
present before being determined to be swap or file?

Cheers,
-- 
Steve

  parent reply	other threads:[~2015-01-29 16:02 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-28 15:24 Mark Brown
2015-01-29 12:29 ` Steve Capper
2015-01-29 16:02 ` Steve Capper [this message]
2015-01-29 16:42   ` Catalin Marinas
2015-01-30 10:04   ` [PATCH] mm: remove remaining references to NUMA hinting bits and helpers -fix Mel Gorman
2015-01-31  9:11     ` Steve Capper

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