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SubjectRe: [BUG] fatal hang untarring 90GB file, possibly writeback related.
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One more data point to add, I've been looking at an identical issue when
copying large amounts of data. I bisected this - and the lockups occur
with commit
3e7d344970673c5334cf7b5bb27c8c0942b06126 - before that I don't see the
issue. With this commit, my file copy test locks up after ~8-10
iterations, before this commit I can copy > 100 times and don't see the
lockup.

On Wed, 2011-04-27 at 15:05 -0500, James Bottomley wrote:
> On Wed, 2011-04-27 at 12:50 -0500, James Bottomley wrote:
> > To test the theory, Chris asked me to try with data=ordered.
> > Unfortunately, the deadlock still shows up. This is what I get.
>
> As another data point: I'm trying the same kernel with CONFIG_PREEMPT
> enabled. This time the deadlock doesn't happen. Instead, kswapd0 gets
> pegged at 99% CPU for much of the untar, but it does eventually
> complete.
>
> James
>
>
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