From: Huang Ying <ying.huang@intel.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Michal Hocko <mhocko@suse.cz>,
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Dave Chinner <david@fromorbit.com>,
LKML <linux-kernel@vger.kernel.org>, LKP ML <lkp@01.org>,
linux-mm <linux-mm@kvack.org>
Subject: Re: [LKP] [mm] cc87317726f: WARNING: CPU: 0 PID: 1 at drivers/iommu/io-pgtable-arm.c:413 __arm_lpae_unmap+0x341/0x380()
Date: Wed, 18 Mar 2015 09:53:54 +0800 [thread overview]
Message-ID: <1426643634.5570.14.camel@intel.com> (raw)
In-Reply-To: <20150317192413.GA7772@phnom.home.cmpxchg.org>
On Tue, 2015-03-17 at 15:24 -0400, Johannes Weiner wrote:
> On Tue, Mar 17, 2015 at 10:15:29AM -0700, Linus Torvalds wrote:
> > Explicitly adding the emails of other people involved with that commit
> > and the original oom thread to make sure people are aware, since this
> > didn't get any response.
> >
> > Commit cc87317726f8 fixed some behavior, but also seems to have turned
> > an oom situation into a complete hang. So presumably we shouldn't loop
> > *forever*. Hmm?
>
> It seems we are between a rock and a hard place here, as we reverted
> specifically to that endless looping on request of filesystem people.
> They said[1] they rely on these allocations never returning NULL, or
> they might fail inside a transactions and corrupt on-disk data.
>
> Huang, against which kernels did you first run this test on this exact
> setup? Is there a chance you could try to run a kernel without/before
> 9879de7373fc? I want to make sure I'm not missing something, but all
> versions preceding this commit should also have the same hang. There
> should only be a tiny window between 9879de7373fc and cc87317726f8 --
> v3.19 -- where these allocations are allowed to fail.
I checked the test result of v3.19-rc6. It shows that boot will hang at
the same position.
BTW: the test is run on 32 bit system.
Best Regards,
Huang, Ying
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next prev parent reply other threads:[~2015-03-18 1:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1426227621.6711.238.camel@intel.com>
2015-03-17 17:15 ` [LKP] [mm] cc87317726f: WARNING: CPU: 0 PID: 1 at drivers/iommu/io-pgtable-arm.c:413 __arm_lpae_unmap+0x341/0x380() Linus Torvalds
2015-03-17 17:28 ` Michal Hocko
2015-03-17 19:24 ` Johannes Weiner
2015-03-18 1:53 ` Huang Ying [this message]
2015-03-18 11:45 ` [LKP] [mm] cc87317726f: WARNING: CPU: 0 PID: 1 atdrivers/iommu/io-pgtable-arm.c:413 __arm_lpae_unmap+0x341/0x380() Tetsuo Handa
2015-03-19 1:57 ` Huang Ying
2015-03-20 13:34 ` [LKP] [mm] cc87317726f: WARNING: CPU: 0 PID: 1atdrivers/iommu/io-pgtable-arm.c:413 __arm_lpae_unmap+0x341/0x380() Tetsuo Handa
2015-03-20 13:38 ` Michal Hocko
2015-03-20 14:02 ` [LKP] [mm] cc87317726f: WARNING: CPU: 0 PID:1atdrivers/iommu/io-pgtable-arm.c:413 __arm_lpae_unmap+0x341/0x380() Tetsuo Handa
2015-03-20 14:34 ` Michal Hocko
2015-03-20 15:41 ` [LKP] [mm] cc87317726f: WARNING: CPU: 0 PID: 1 at drivers/iommu/io-pgtable-arm.c:413 __arm_lpae_unmap+0x341/0x380() Tetsuo Handa
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