Re: corruption of active mmapped files in btrfs snapshots

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On Fri, Mar 22, 2013 at 10:26:59AM -0400, Chris Mason wrote:
> Quoting Alexandre Oliva (2013-03-22 10:17:30)
> > On Mar 22, 2013, Chris Mason <clmason@xxxxxxxxxxxx> wrote:
> > 
> > > Are you using compression in btrfs or just in leveldb?
> > 
> > btrfs lzo compression.
> 
> Perfect, I'll focus on that part of things.

> > > I'd like to take snapshots out of the picture for a minute.

I've reproduced this without compression, with autodefrag on. The test
was using snapshots (ie. the unmmodified versino) and ended with

1087 blocks, 4316779 total size
snaptest.268/ca snaptest.268/db differ: char 4245170, line 16

after a few minutes.

Before that, I was running the NOSNAPS mode for many-minutes (up to 50k
rounds) without a reported problem.

There was the same 'make clean && make -j 32' kernel compilation running
in parallel, the box has 8 cpus, 4GB ram. Watching 'free' showed the
memory going up to a few gigs and down to ~130MB.


david
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