From: Ted Ts'o <tytso@mit.edu>
To: Jon Nelson <jnelson@jamponi.net>
Cc: Matt <jackdachef@gmail.com>, Chris Mason <chris.mason@oracle.com>,
Andi Kleen <andi@firstfloor.org>,
Mike Snitzer <snitzer@redhat.com>, Milan Broz <mbroz@redhat.com>,
linux-btrfs <linux-btrfs@vger.kernel.org>,
dm-devel <dm-devel@redhat.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
htd <htd@fancy-poultry.org>, htejun <htejun@gmail.com>,
linux-ext4 <linux-ext4@vger.kernel.org>
Subject: Re: hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt barrier support is effective)
Date: Sun, 12 Dec 2010 07:43:54 -0500 [thread overview]
Message-ID: <20101212124354.GA4513@thunk.org> (raw)
In-Reply-To: <AANLkTinhHTqqpP=pQ8Foyc9xeaZi65GHGHGY51OyZtvF@mail.gmail.com>
On Sun, Dec 12, 2010 at 04:18:29AM -0600, Jon Nelson wrote:
> > I have one CPU configured in the environment, 512MB of memory.
> > I have not done any memory-constriction tests whatsoever.
I've finally been able to reproduce it myself, on real hardware. SMP
is not necessary to reproduce it, although having more than one CPU
doesn't hurt. What I did need to do (on real hardware with 4 gigs of
memory) was to turn off swap and pin enough memory so that free memory
was around 200megs or so before the start of the test. (This is the
natural amount of free memory that the system would try to reach,
since 200 megs is about 5% of 4 gigs.)
Then, during the test, free memory would drop to 50-70 megabytes,
forcing writeback to run, and then I could trigger it about 1-2 times
out of three.
I'm guessing that when you used 512mb of memory, that was in effect a
memory-constriction test, and if you were to push the memory down a
little further, it might reproduce even more quickly. My next step is
to try to reproduce this in a VM, and then I can start probing to see
what might be going on.
- Ted
next prev parent reply other threads:[~2010-12-12 12:44 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20101114205925.GA20451@redhat.com>
[not found] ` <AANLkTi=rVyozmvqCJD1kGqnV3uEn-0ak6B12-O_9XOKJ@mail.gmail.com>
[not found] ` <4CE05A9E.9090204@redhat.com>
[not found] ` <AANLkTimT0t3xqgKdAn7MBPD7ED-9uPS+WJE0z+K8tciu@mail.gmail.com>
[not found] ` <AANLkTik_p0yxQBQ3ehHWYPLfiqxGbSNUT5XUk9dC5-x6@mail.gmail.com>
[not found] ` <20101201165229.GC13415@redhat.com>
[not found] ` <AANLkTinG209iRAXgpNC0vNpn1C02wkYmVfveXRBqsKV-@mail.gmail.com>
[not found] ` <4CF692D1.1010906@redhat.com>
[not found] ` <AANLkTimA2PPXZoOHYgeOEV2ocrojeuBby8MYDYJ1yjx1@mail.gmail.com>
[not found] ` <4CF6B3E8.2000406@redhat.com>
2010-12-01 21:23 ` hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt barrier support is effective) Mike Snitzer
2010-12-02 21:30 ` Matt
2010-12-04 19:18 ` Matt
2010-12-04 19:38 ` Mike Snitzer
2010-12-04 23:47 ` Matt
2010-12-07 14:21 ` Chris Mason
2010-12-07 18:10 ` Jon Nelson
2010-12-07 18:15 ` Chris Mason
2010-12-07 18:22 ` Mike Snitzer
2010-12-07 18:45 ` Jon Nelson
2010-12-07 18:52 ` Chris Mason
2010-12-07 19:34 ` Jon Nelson
2010-12-07 20:02 ` Chris Mason
2010-12-07 20:25 ` Jon Nelson
2010-12-07 20:33 ` Chris Mason
2010-12-07 20:36 ` Jon Nelson
2010-12-07 20:41 ` Chris Mason
2010-12-07 20:48 ` Jon Nelson
2010-12-07 21:02 ` Chris Mason
2010-12-08 3:29 ` Jon Nelson
2010-12-08 8:03 ` hunt for 2.6.37 dm-crypt+ext4 corruption? Milan Broz
2010-12-08 12:20 ` hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt barrier support is effective) Chris Mason
2010-12-16 3:37 ` Dave Chinner
2010-12-16 12:29 ` Chris Mason
2010-12-08 3:55 ` Jon Nelson
2010-12-07 19:35 ` Ted Ts'o
2010-12-07 21:01 ` Jon Nelson
2010-12-08 3:37 ` Jon Nelson
[not found] ` <AANLkTim8UTkfxXV0AkEfjNq3tcmnrXdh6BQ1ibY5iYPy@mail.gmail.com>
2010-12-08 15:26 ` Jon Nelson
2010-12-09 18:01 ` Ted Ts'o
2010-12-09 18:10 ` Jon Nelson
2010-12-09 20:13 ` Ted Ts'o
2010-12-09 20:38 ` Jon Nelson
[not found] ` <AANLkTik=ivDrBEzg1wQAp5AFzNtRRq1=NpvnowggU=_0@mail.gmail.com>
2010-12-09 23:16 ` Andi Kleen
2010-12-10 1:38 ` Chris Mason
2010-12-10 1:53 ` Matt
2010-12-10 2:38 ` Ted Ts'o
2010-12-10 6:52 ` Jon Nelson
2010-12-10 14:58 ` Jon Nelson
[not found] ` <AANLkTikeiv2jQM5hhghs1Zd2d=5CbRLKMgYvqHqpm76m@mail.gmail.com>
2010-12-10 16:54 ` Jon Nelson
[not found] ` <AANLkTinMt6saGeeX3MbwAzZ-+f6AL5BegeFqyPgGwiDo@mail.gmail.com>
2010-12-11 2:14 ` Jon Nelson
[not found] ` <AANLkTi=cn04WZGMnVX6ie5PSM+9v0tJSSg0kD8_W5N11@mail.gmail.com>
2010-12-12 1:40 ` Ted Ts'o
2010-12-12 2:34 ` Ted Ts'o
2010-12-12 3:16 ` Jon Nelson
[not found] ` <AANLkTim=i8wDnML+K4uGK_neNDCiWxtKGDx01O+3joaE@mail.gmail.com>
2010-12-12 10:18 ` Jon Nelson
[not found] ` <AANLkTinhHTqqpP=pQ8Foyc9xeaZi65GHGHGY51OyZtvF@mail.gmail.com>
2010-12-12 12:43 ` Ted Ts'o [this message]
2010-12-12 13:11 ` Jon Nelson
2010-12-13 2:06 ` Ted Ts'o
2010-12-13 18:56 ` Jon Nelson
[not found] ` <AANLkTinMWS-yyzWJ3oBo_KS9jXt4p4pveo+SPTLiWnCt@mail.gmail.com>
2010-12-15 19:15 ` Matt
2010-12-15 19:16 ` Andi Kleen
2010-12-15 19:25 ` Matt
2010-12-15 19:28 ` Matt
2010-12-10 1:58 ` Mike Fedyk
2010-12-10 2:00 ` Chris Mason
2010-12-10 2:05 ` Jon Nelson
2010-12-04 23:52 ` Matt
2010-12-05 10:09 ` Heinz Diehl
2010-12-05 10:21 ` hunt for 2.6.37 dm-crypt+ext4 corruption? Milan Broz
2010-12-05 12:49 ` Heinz Diehl
2010-12-05 13:24 ` [dm-devel] " Theodore Tso
2010-12-05 13:44 ` Matt
2010-12-05 14:02 ` Ted Ts'o
2010-12-05 14:33 ` Heinz Diehl
2010-12-05 20:17 ` Daniel J Blueman
2010-12-06 7:08 ` Heinz Diehl
2010-12-05 20:28 ` Andi Kleen
2010-12-05 21:15 ` Mike Snitzer
2010-12-05 21:42 ` [dm-devel] " Milan Broz
2010-12-06 2:37 ` Valdis.Kletnieks
2011-01-06 15:56 ` Heinz Diehl
2011-01-07 16:45 ` Matt
2010-12-05 13:30 ` hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt barrier support is effective) Matt
2010-12-05 0:57 ` Matt
2010-12-04 20:51 ` Heinz Diehl
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