https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241808
--- Comment #3 from commit-h...@freebsd.org --- A commit references this bug: Author: vmaffione Date: Tue Nov 12 21:07:51 UTC 2019 New revision: 354659 URL: https://svnweb.freebsd.org/changeset/base/354659 Log: bhyve: rework mevent processing to fix a race condition At the end of both mevent_add() and mevent_update(), mevent_notify() is called to wakeup the I/O thread, that will call kevent(changelist) to update the kernel. A race condition is possible where the client calls mevent_add() and mevent_update(EV_ENABLE) before the I/O thread has the chance to wake up and call mevent_build()+kevent(changelist) in response to mevent_add(). The mevent_add() is therefore ignored by the I/O thread, and kevent(fd, EV_ENABLE) is called before kevent(fd, EV_ADD), resuliting in a failure of the kevent(fd, EV_ENABLE) call. PR: 241808 Reviewed by: jhb, markj MFC with: r354288 Differential Revision: https://reviews.freebsd.org/D22286 Changes: head/usr.sbin/bhyve/mevent.c -- You are receiving this mail because: You are the assignee for the bug. _______________________________________________ freebsd-virtualization@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"
