From: Anton Ivanov
For more details see:
http://stackoverflow.com/questions/4624071/pipe-buffer-size-is-4k-or-64k
The observations on that thread have been confirmed by us for UML's
UBD driver. If you load UML with network IO and do disk IO at the same
time the UBD IO helper thread fails to pro
This bug has been there as far back as 2.6.x... It is known as
"userspace process sits in Z state", occasional hang, etc. It has been
tagged by maintainers as "unreproducible" for 7 odd years now. I agree -
on stock UML it is difficult to reproduce - it may take half a day to
hit it when running a
