[Bug 218571] umtx compat6 regression affecting 'jar' command

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218571

--- Comment #11 from [email protected] ---
A commit in branch stable/13 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=2fb281fa02d34b31b25e949415cfda4549b5aa6b

commit 2fb281fa02d34b31b25e949415cfda4549b5aa6b
Author:     Konstantin Belousov <[email protected]>
AuthorDate: 2021-07-19 15:40:38 +0000
Commit:     Konstantin Belousov <[email protected]>
CommitDate: 2021-08-03 09:52:36 +0000

    Revert most of ce42e793100b460f597e4c85ec0da12e274f9394

    to restore ABI compatibility for pre-10.x binaries.

    It restores _umtx_lock() and _umtx_unlock() syscalls, and UMTX_OP_LOCK/
    UMTX_OP_UNLOCK umtx_op(2) operations. UMUTEX_ERROR_CHECK flag is left
    out for now, I do not think it makes a difference.

    PR:     218571
    Reviewed by:    brooks (previous version)
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D31220

    (cherry picked from commit 9b6b793bd79521edc082a89b264a30881cb65e22)

 sys/compat/freebsd32/syscalls.master |   6 +-
 sys/kern/kern_umtx.c                 | 446 ++++++++++++++++++++++++++++++++++-
 sys/kern/syscalls.master             |  14 +-
 sys/sys/_umtx.h                      |   4 +
 sys/sys/umtx.h                       |   7 +-
 5 files changed, 467 insertions(+), 10 deletions(-)

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