[Bug 284437] zdb -y somepool fails

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284437

Rob Norris <robn@despairlabs.com> changed:

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                 CC|                            |robn@despairlabs.com

--- Comment #2 from Rob Norris <robn@despairlabs.com> ---
I've been explaining to people all morning that by itself, zdb crashing is
meaningless. It's not a general purpose tool. It's a parallel implementation of
the ZFS core, in userspace, that runs against the block devices directly,
"under" the kernel implementation (if it exists). The most common reason for it
crashing against an active pool is that the on-disk data changed out from under
it, and it got confused. This is not rare.

I'm not saying there's not some people with broken pools as reported upstream.
I am saying that if the _only_ data point is "zdb crashed", then there is
almost certainly no issue.

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