Part_blk/USB issue

[Nobody III]

I have been experimenting with things related to my issue when using
part_blk with ahci, and I have found that it works fine in both QEMU and
Virtualbox. However, when I combine part_blk with usb_drv, I encounter what
appears to be the exact same problem, but it only occurs on some of the
kernels. The scenario works bug-free on okl4 and fiasco, but freezes on foc
and nova. Note that other servers such as rump_fs work just fine with the
usb driver, so the problem isn't a simple driver failure. I've attached the
run script for the usb and part_blk scenario. I hope this helps fix my AHCI
issue (which only occurs on real hardware) as well.
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