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    SubjectRe: [BUG] fatal hang untarring 90GB file, possibly writeback related.
    On Thu 28-04-11 12:36:30, Colin Ian King wrote:
    > 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.
    Adding Mel to CC, I guess he'll be interested. Mel, it seems this commit
    of yours causes kswapd on non-preempt kernels spin for a *long* time...

    Honza
    > 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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    >
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    --
    Jan Kara <jack@suse.cz>
    SUSE Labs, CR


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