[Bug 258412] kevent EVFILT_TIMER, EV_DISPATCH lost if event is re-enabled

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258412

--- Comment #3 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=d6d4f9b45e0be306bdaf53b2133b2cd0f7642167

commit d6d4f9b45e0be306bdaf53b2133b2cd0f7642167
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2022-05-25 00:16:32 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2022-05-25 00:16:32 +0000

    kqueue tests: Add new EVFILT_TIMER regression tests from upstream

    One of the tests exposes the regression reported in PR 264131.

    One test is disabled because FreeBSD does not support setting EV_ONESHOT
    on an already-added periodic timer.  Though, in this case the flag is
    simply ignored, which isn't ideal.

    One test is slightly modified to set EV_ADD when reconfiguring a
    disabled timer per some commentary in PR 258412.

    Ideally we would re-import the test suite from libkqueue but there is a
    fair bit of divergence so this will require some effort.  This just gets
    us one small step closer while increasing test coverage.

    PR:             258412
    MFC after:      2 weeks
    Sponsored by:   The FreeBSD Foundation

 tests/sys/kqueue/libkqueue/config.h |   1 +
 tests/sys/kqueue/libkqueue/timer.c  | 129 +++++++++++++++++++++++++++++++++++-
 2 files changed, 128 insertions(+), 2 deletions(-)

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