[Bug 192085] [zfs] panic on zvol resize

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192085

--- Comment #1 from Kristof Provost <kristof at freebsd.org> ---
I've poked at this a bit more, and I think I understand the problem now.

zvol_set_volsize() takes a hold on the file system with dmu_objset_hold()
and then verifies that it's not marked as read-only.
It does this through dsl_prop_get_integer() which also tries to take a
hold on the file system with dmu_objset_hold(). That triggers the assert
in dsl_pool_hold().

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