From owner-freebsd-bugs@freebsd.org Sun Nov 19 12:40:02 2017 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 07565DF444A for ; Sun, 19 Nov 2017 12:40:02 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id E982876F8D for ; Sun, 19 Nov 2017 12:40:01 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id vAJCe1TO084968 for ; Sun, 19 Nov 2017 12:40:01 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 223745] PROC_REAP_KILL misses descendants if another process has become a reaper in between Date: Sun, 19 Nov 2017 12:40:01 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: muh.muhten@gmail.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 19 Nov 2017 12:40:02 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D223745 Bug ID: 223745 Summary: PROC_REAP_KILL misses descendants if another process has become a reaper in between Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: muh.muhten@gmail.com PROC_REAP_KILL sends a signal to processes that (when REAPER_KILL_CHILDREN = is not set) _are to be reaped by_ the reaper of the specified process. If that reaper has a descendant which has acquired reaper status, then the descendant reaper's descendants will not be considered descendants of the reaper of the specified process. An implication is that, if a reaper kills all its descendants with SIGKILL,= it can still have children reparented to it due to their reaper getting killed. I don't see many situations where it would be useful to signal a paraphylet= ic subtree of a reaper's descendant. On the other hand, it would be useful to = be signal a subtree in such a way that a process cannot "escape" being killed.= The latter is sort of achieved by repeatedly signalling all descendants of a re= aper until no children can be killed, but the call has not failed on any particu= lar process (i.e. rk_fpid =3D=3D -1); however, this requires that the reaper be specified by its own pid (and not that of a descendant, since that descenda= nt will die) and on the whole does not seem reasonable. I suggest a flag for PROC_REAP_KILL to recursively kill the descendants of reaper descendants of reapers. --=20 You are receiving this mail because: You are the assignee for the bug.=