Hi folks, This is the first fix for the problems Brian has reported from generic/019. This has fixed the hang, but the other log recovery problem he reported is still present (seen once with these patches in place). I've tested these out to a couple of hundred cycles of continual looping generic/019 before the systems fall over with a perag reference count underrun at unmount after a shutdown. I'm pretty sure the hang is fixed, as it would manifest within 10-20 cycles without this patch. The first patch is the iclogbuf state tracing I used to capture the iclogbuf wrapping state. The second patch is the fix. Cheers, Dave.
