Date: Mon, 13 Apr 2026 04:01:52 +0000 From: Kyle Evans <kevans@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: d02c54533aa4 - stable/15 - kqueue: add some kn_knlist assertions around knlist_(add|remove) Message-ID: <69dc6ab0.1e208.9d30c33@gitrepo.freebsd.org>
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The branch stable/15 has been updated by kevans: URL: https://cgit.FreeBSD.org/src/commit/?id=d02c54533aa49980ad3e8b984d9af4ec835d9adc commit d02c54533aa49980ad3e8b984d9af4ec835d9adc Author: Kyle Evans <kevans@FreeBSD.org> AuthorDate: 2026-04-01 22:30:48 +0000 Commit: Kyle Evans <kevans@FreeBSD.org> CommitDate: 2026-04-13 03:12:29 +0000 kqueue: add some kn_knlist assertions around knlist_(add|remove) We currently assert that kn_status is accurate, but there's more room for error. Neither of these are very likely, but currently we'd blow up in SLIST*() macros instead of providing more obvious diagnostics. It's perhaps only worth testing these because knlist_remove() requires getting logic across both f_attach() and f_detach() correct. Reviewed by: kib, markj (cherry picked from commit 306c9049c642da6a59a5dc088589605a9aa38b87) --- sys/kern/kern_event.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/sys/kern/kern_event.c b/sys/kern/kern_event.c index 2d7df3da58bb..915d34ac1695 100644 --- a/sys/kern/kern_event.c +++ b/sys/kern/kern_event.c @@ -2619,6 +2619,8 @@ knlist_add(struct knlist *knl, struct knote *kn, int islocked) KASSERT(kn_in_flux(kn), ("knote %p not in flux", kn)); KASSERT((kn->kn_status & KN_DETACHED) != 0, ("knote %p was not detached", kn)); + KASSERT(kn->kn_knlist == NULL, + ("knote %p was already on knlist %p", kn, kn->kn_knlist)); if (!islocked) knl->kl_lock(knl->kl_lockarg); SLIST_INSERT_HEAD(&knl->kl_list, kn, kn_selnext); @@ -2641,6 +2643,8 @@ knlist_remove_kq(struct knlist *knl, struct knote *kn, int knlislocked, KASSERT(kqislocked || kn_in_flux(kn), ("knote %p not in flux", kn)); KASSERT((kn->kn_status & KN_DETACHED) == 0, ("knote %p was already detached", kn)); + KASSERT(kn->kn_knlist == knl, + ("knote %p was not on knlist %p", kn, knl)); if (!knlislocked) knl->kl_lock(knl->kl_lockarg); SLIST_REMOVE(&knl->kl_list, kn, knote, kn_selnext);home | help
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