From owner-svn-src-all@freebsd.org Mon Jan 14 07:31:20 2019 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 999841496771; Mon, 14 Jan 2019 07:31:20 +0000 (UTC) (envelope-from kib@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) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 3C08F74918; Mon, 14 Jan 2019 07:31:20 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 23ED4277FA; Mon, 14 Jan 2019 07:31:20 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x0E7VKvP065141; Mon, 14 Jan 2019 07:31:20 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x0E7VKYY065140; Mon, 14 Jan 2019 07:31:20 GMT (envelope-from kib@FreeBSD.org) Message-Id: <201901140731.x0E7VKYY065140@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Mon, 14 Jan 2019 07:31:20 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r343017 - head/sys/kern X-SVN-Group: head X-SVN-Commit-Author: kib X-SVN-Commit-Paths: head/sys/kern X-SVN-Commit-Revision: 343017 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 3C08F74918 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.93 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.999,0]; NEURAL_HAM_SHORT(-0.94)[-0.937,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_HAM_LONG(-1.00)[-0.999,0] X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Jan 2019 07:31:20 -0000 Author: kib Date: Mon Jan 14 07:31:19 2019 New Revision: 343017 URL: https://svnweb.freebsd.org/changeset/base/343017 Log: Handle overflow in calculating max kmem size. vm_kmem_size is u_long, and it might be not capable of holding page count times PAGE_SIZE, even when scaled down by VM_KMEM_SIZE_SCALE. As bde reported, 12G PAE config ends up with zero for kmem size. Explicitly check for overflow and clamp kmem size at vm_kmem_size_max. If we end up at zero size because VM_KMEM_SIZE_MAX is not defined, panic with clear explanation rather then failing in a way which is hard to relate. Reported by: bde, pho Tested by: pho Reviewed by: markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D18767 Modified: head/sys/kern/kern_malloc.c Modified: head/sys/kern/kern_malloc.c ============================================================================== --- head/sys/kern/kern_malloc.c Mon Jan 14 07:25:44 2019 (r343016) +++ head/sys/kern/kern_malloc.c Mon Jan 14 07:31:19 2019 (r343017) @@ -920,13 +920,16 @@ kmeminit(void) * variable: */ if (vm_kmem_size == 0) { - vm_kmem_size = (mem_size / vm_kmem_size_scale) * PAGE_SIZE; - + vm_kmem_size = mem_size / vm_kmem_size_scale; + vm_kmem_size = vm_kmem_size * PAGE_SIZE < vm_kmem_size ? + vm_kmem_size_max : vm_kmem_size * PAGE_SIZE; if (vm_kmem_size_min > 0 && vm_kmem_size < vm_kmem_size_min) vm_kmem_size = vm_kmem_size_min; if (vm_kmem_size_max > 0 && vm_kmem_size >= vm_kmem_size_max) vm_kmem_size = vm_kmem_size_max; } + if (vm_kmem_size == 0) + panic("Tune VM_KMEM_SIZE_* for the platform"); /* * The amount of KVA space that is preallocated to the