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RE: [Xen-devel] problems saving in 2.04

> So, I upgraded to 2.04 and the saving still doesn't work correctly, 
> however when I run xfrd under gdb or strace -fF it works perfectly.

Hmm, very interesting.

Please can you try applying this patch to your xend (no need to
recompile) which stops xend swallowing useful debug output.

You might want to modify it to capture stdout to xend-debug.log too.

> This would indicate that it is either a memory allocation error or a 
> race condition somewhere, nice bug to track down :-(.

My bet would be on some stupid interaction with twisted and EAGAIN
return codes on the io path between xfrd and xend. I would instrument
the IO functions to see if they ever return error codes...


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