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git2svn
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svn:date
V 27
2023-09-21T22:28:19.732752Z
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svn:log
V 798
Fix zfsd with the device_removal pool feature.

Previously zfsd would crash in the presence of a pool with a
top-level-vdev that had previously been removed.  The crash happened
because the configuration nvlist of such a TLV contains an empty
ZPOOL_CONFIG_CHILDREN array, which led to a pop_front from an empty
list, which has undefined behavior.

The crash only happened in stable/14 and later, probably do to
differences in libcxx, but the change should be MFCed anyway.

PR:		273663
Reported by:	Marek Zarychta <zarychtam@plan-b.pwste.edu.pl>
Sponsored by:	Axcient
Reviewed by:	mav
Differential Revision: https://reviews.freebsd.org/D41818

(cherry picked from commit 0b294a386d34f6584848ed52407687df7ae59861)

Git Hash:   b2dff90c0be7c92a228fdbee5f69335dcc8044fb
Git Author: asomers@FreeBSD.org
END