Re: torrent hash failures since 3.9.0-rc1

From: Theodore Ts'o
Date: Mon Mar 11 2013 - 23:31:16 EST

On Tue, Mar 12, 2013 at 11:00:58AM +0800, Zheng Liu wrote:
> Thanks for reporting this problem. My deepest apologies.
> As Ted suggested, could you please try to use ext4 git tree? I want to
> make sure whether this bug has been fixed by my lastest patch series or
> not.

It's definitely worth a try to compile the master branch of the ext4
tree and see if it reproduces or not.

However, I suspect the problem will still be there. Based on the
commit which Markus has identified, I'm guessing it's a race between
the extents_status shrinker and writing into uninitialized region of
the file (since apprently compiling rtorrent with
--with-posix-fallocate is required).

Markus, how much memory do you have in your system? That may be the
other reason why I haven't been able to reproduce it to date; I had a
lot of free memory when I tried to reproduce the problem, so the slab
shrinker didn't engage.


- Ted
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