[Bug 229614] ZFS lockup in zil_commit_impl

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229614

--- Comment #40 from Michael Gmelin <grembo at FreeBSD.org> ---
(In reply to Allan Jude from comment #38)

Andreas managed to reproduce the issue with the patch (like predicted by avg
and you), but it took days of hammering the system heavily.

@Allan/avg: Do you have an overview of all the possible code paths in which
this interlock can happen? I didn't look closely at the code myself yet.

If it's just about reclaiming a vnode, we could just allow that to fail and
either retry the operation or allow exceeding kern.maxvnodes temporarily (like
in a kind of soft-fail scenario).

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