[Bug 222007] Deadlock at shutdown time between zfs and usb when using usb stick as cache device

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222007

--- Comment #3 from Bertrand Petit <bsdpr at phoe.frmug.org> ---
I'm not cognizant of the zfs internals, I did a quick search of the zfs sources
from which I came to the conclusion that the SPA part is managing the raw
devices, am I right? Then I activated that subsystem's debug messages
(vfs.zfs.debug set to 32). I expected to see messages when the devices are
released but none were printed, not even for the SATA drives. Where should I
search next?

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