RE: [Xen-devel] problems saving in 2.04

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> 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.

http://xen.bkbits.net:8080/xen-2.0-testing.bk/gnupatch@4207b472nHz4nbC_O
JgbSmfRVow8XQ
 
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...

Thanks,
Ian


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