Date: Mon, 06 Sep 2021 23:44:43 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 258310] kevent() does not see signal with zero timeout Message-ID: <bug-258310-227-M0zuc2vgca@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-258310-227@https.bugs.freebsd.org/bugzilla/> References: <bug-258310-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D258310 --- Comment #4 from commit-hook@FreeBSD.org --- A commit in branch main references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=3D98168a6e6c12dab8f608f6b5f5b0b175d= 2b87ef0 commit 98168a6e6c12dab8f608f6b5f5b0b175d2b87ef0 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2021-09-06 11:43:06 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2021-09-06 23:43:34 +0000 kqueue: drain kqueue taskqueue if syscall tickled it Otherwise return from the syscall and next syscall, which could be kevent(2) on the kqueue that should be notified, races with the kqueue taskqueue thread, and potentially misses the wakeup. This is reliably visible when kevent(2) only peeks into events using zeroed timeout. PR: 258310 Reported by: arichardson, Jan Kokem=C3=BCller <jan.kokemueller@gmail= .com> Reviewed by: arichardson, markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D31858 sys/kern/kern_event.c | 11 +++++++++++ sys/kern/subr_trap.c | 7 ++++++- sys/sys/event.h | 1 + sys/sys/proc.h | 2 +- 4 files changed, 19 insertions(+), 2 deletions(-) --=20 You are receiving this mail because: You are the assignee for the bug.=
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