[Bug 238883] Fatal double fault using unionfs to build www/node port (repeatable)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238883

--- Comment #5 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=372691a7ae1878ecdf707195b0854750f07bf44e

commit 372691a7ae1878ecdf707195b0854750f07bf44e
Author:     Jason A. Harmening <jah@FreeBSD.org>
AuthorDate: 2021-06-12 19:45:18 +0000
Commit:     Jason A. Harmening <jah@FreeBSD.org>
CommitDate: 2021-06-29 13:02:01 +0000

    unionfs: release parent vnodes in deferred context

    Each unionfs node holds a reference to its parent directory vnode.
    A single open file reference can therefore end up keeping an
    arbitrarily deep vnode hierarchy in place.  When that reference is
    released, the resulting VOP_RECLAIM call chain can then exhaust the
    kernel stack.

    This is easily reproducible by running the unionfs.sh stress2 test.
    Fix it by deferring recursive unionfs vnode release to taskqueue
    context.

    PR: 238883
    Reviewed By:    kib (earlier version), markj
    Differential Revision: https://reviews.freebsd.org/D30748

 sys/fs/unionfs/union.h      |  6 ++++-
 sys/fs/unionfs/union_subr.c | 55 ++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 55 insertions(+), 6 deletions(-)

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