[Bug 241118] [boot] 12.1-BETA3 installer hangs before loader menu

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241118

--- Comment #26 from commit-hook at freebsd.org ---
A commit references this bug:

Author: tsoome
Date: Sun Dec 22 08:22:03 UTC 2019
New revision: 356003
URL: https://svnweb.freebsd.org/changeset/base/356003

Log:
  MFC r354283, r354323, r354363, r354364, r354593, r355773, r355786:

  loader: we do not support booting from pool with log device
  loader: factor out label and uberblock load from vdev_probe, add MMP checks
  loader: populate nvl with data even when label_txg is 0
  loader: clean up the noise around log device
  loader: memory leak in vdev_label_read_config()
  loader: zfsimpl.c cstyle cleanup
  loader: rewrite zfs vdev initialization

  In some cases the pool discovery will get stuck in infinite loop while
setting
  up the vdev children.

  To fix, we split the vdev setup into two parts, first we create vdevs based
on
  configuration we do get from pool label, then, we process pool config from
MOS
  and update the pool config if needed.

  This patch bundle is work leading to and including fix for issue when
  in some cases the pool configuration build does end up in infinite loop.

  PR:           241118
  Reported by:  Ryan Moeller

Changes:
_U  stable/12/
  stable/12/stand/libsa/zfs/zfsimpl.c
  stable/12/sys/cddl/boot/zfs/zfsimpl.h
  stable/12/sys/cddl/boot/zfs/zfssubr.c

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