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Looking at the code, one obvious source of intermittent failure is that the Linux implementations of ReadBytes and WriteBytes don't check for EINTR. I doubt that's the failure you're seeing because it would be more randomly distributed but it's something that should be fixed. More likely as the cause of failure in your case is that read is returning less than the number of bytes

On 26 November 2013 19:05, Kaylor, Andrew <andrew.kaylor at intel.com> wrote: > I would also note that the failure isn’t actually in anything > MCJIT-specific. Aside from the fact that it seems to be clang-specific, > the code that is failing is specific to the lli remote implementation. > It’s not clear to me why it would fail under aggressive optimization with > clang,