Re: writeback hang in current mainline

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On Wed, May 26, 2010 at 02:56:15PM +0200, Jens Axboe wrote:
> On Wed, May 26 2010, Christoph Hellwig wrote:
> > On Wed, May 26, 2010 at 02:21:26PM +0200, Jens Axboe wrote:
> > > Ugh ok I see it, I had the caller_frees reverted. Try this :-)
> > 
> > This seems to fix it.  Running some more tests now.
> 
> Goodie, then the analysis at least is correct. A potentially cleaner fix
> would be to just allocate the WB_SYNC_NONE && sb_pinned work struct on
> the stack, since then we can get rid of that nastiness in
> wb_work_complete() as well (and not pass 'sb_pinned' around so much).
> 
> If you have time, care to test this one as well?

Both this and the previous one hang hard in xfstests 007, with no chance
of getting a backtrace.

For now I would recommend to revert
21c12849fef73efc9a898b6702fe421fd774f515 and
29c795f02e68ecd7bb1374844d3e55e882ac158f,
which makes xfstests run fine for me.

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