zpool upgrade - Assertion failed: ... libzfs/common/libzfs_config.c, line 250

[Fabian Keil]

Mark Martinec <Mark.Martinec+freebsd at ijs.si> wrote:

> P.S. Seems this was due to one external (removable) disk (with its
> own pool) not being connected to the host. After making it available,
> the 'zpool upgrade' command completed normally, listing all pools.

That's a known issue:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=182248

Fabian
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