From owner-freebsd-bugs@freebsd.org Thu Jan 11 23:46:17 2018 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 27078E5C901 for ; Thu, 11 Jan 2018 23:46:17 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 0E2636B8D6 for ; Thu, 11 Jan 2018 23:46:17 +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 mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id 03A175EDC for ; Thu, 11 Jan 2018 23:46:17 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id w0BNkGok096315 for ; Thu, 11 Jan 2018 23:46:16 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id w0BNkGNc096314 for freebsd-bugs@FreeBSD.org; Thu, 11 Jan 2018 23:46:16 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 224479] kernel panic in reboot+swapoff sys call Date: Thu, 11 Jan 2018 23:46:15 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: patch X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: ota@j.email.ne.jp X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: 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: Thu, 11 Jan 2018 23:46:17 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224479 --- Comment #32 from ota@j.email.ne.jp --- (In reply to Conrad Meyer from comment #31) if tmpfs uses large memory so that files on tmpfs were swapped out, the 1st swapoff_all() can fail due to insufficient memory. vfs_unmountall() will unmount and release such tmpfs memory so that 2nd swapoff_all() may be able to swapoff this time; however, if swap spaces left are still NFS files or mdconfig files, we will still get panic. So, I changed swapoff_all() to release in the reverse order swap spaces are added. System adds swap devices at start (given the penalty of mdconfig/NF= S, raw devices are best and most suitable for default entries). When memory and swap space go short, I add md-file or NFS files to avoid immediate issues. So, reverse order in swap_all will take outs manually ad= ded entries first to reduce chances of panic. Actually... if all file systems are already unmounted, any processes get swapped-in from swap spaces cannot do much useful anyway; indeed, we may not need 2nd(existing) swapoff_all()... --=20 You are receiving this mail because: You are the assignee for the bug.=