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11f2e9a491
This prevents a panic after a SLOG add/removal on the root pool followed by a zpool scrub. When a SLOG is removed, a hole takes its place - the vdev_ops for a hole is vdev_hole_ops, which defines the handler functions of vdev_op_hold and vdev_op_rele as NULL. This bug has been reported in illumos and FreeBSD, a different trigger in the FreeBSD report though. Credit for this patch goes to Patrick Mooney <pmooney@pfmooney.com> Obtained from: illumos-gate commit: c65bd18728f34725 External-issue: https://www.illumos.org/issues/12981 External-issue: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252396 Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rob Wing <rob.fx907@gmail.com> Closes #11623