From nobody Fri Jul 23 19:04:59 2021 X-Original-To: bugs@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id F291512B68C4 for ; Fri, 23 Jul 2021 19:04:58 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4GWdzt6T21z4c9S for ; Fri, 23 Jul 2021 19:04:58 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id C7BA22A2B7 for ; Fri, 23 Jul 2021 19:04:58 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 16NJ4wJN015458 for ; Fri, 23 Jul 2021 19:04:58 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 16NJ4wpI015457 for bugs@FreeBSD.org; Fri, 23 Jul 2021 19:04:58 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: bugs@FreeBSD.org Subject: [Bug 257314] FBSD 13 crash after some KDE parts crash supposing out of swap space Date: Fri, 23 Jul 2021 19:04:59 +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: 13.0-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: marklmi26-fbsd@yahoo.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: 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 List-Id: Bug reports List-Archive: https://lists.freebsd.org/archives/freebsd-bugs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-bugs@freebsd.org MIME-Version: 1.0 X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D257314 --- Comment #16 from Mark Millard --- (In reply to Mark Millard from comment #14) The large I/O times may well be mostly wait-time in a queue with a large queue built up of pending I/Os. So: the system generating pages to write after than the I/O system is writing them might be what is going on. (An large accumulated set of pending reads may not be so likely to be generated. That is why I picked on writing out pages as an example.) Again, I'm not sure the long I/O times are driving things. I also made a silly assumption and there is another experiment: increasing vm.pageout_oom_seq. I know someone used something like: vm.pageout_oom_seq=3D4000 I've no clue if there is a figure large enough to have numeric overflows involved or other issues. But this figure likely can be rather large. The 120 value was enough to allow -j4 buildworld buildkernel to complete on low end armv7 and aarch64 hardware. Mixed with vm.pfault_oom_attempts=3D-1 it was enough for someone using a microsd card as I remember. (My I/O context was better for the purpose in such a context.) --=20 You are receiving this mail because: You are the assignee for the bug.=