From nobody Mon May 6 12:41:07 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; envelope-from=libvir-list-bounces@redhat.com; helo=mx1.redhat.com; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=libvir-list-bounces@redhat.com Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by mx.zohomail.com with SMTPS id 1536837963405790.0887008649686; Thu, 13 Sep 2018 04:26:03 -0700 (PDT) Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2662030015D6; Thu, 13 Sep 2018 11:26:01 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E6AC65D6AA; Thu, 13 Sep 2018 11:26:00 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 74EFE4BB75; Thu, 13 Sep 2018 11:26:00 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id w8DBPxG8021107 for ; Thu, 13 Sep 2018 07:25:59 -0400 Received: by smtp.corp.redhat.com (Postfix) id 29FC2104C529; Thu, 13 Sep 2018 11:25:59 +0000 (UTC) Received: from mx1.redhat.com (ext-mx09.extmail.prod.ext.phx2.redhat.com [10.5.110.38]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 1FD1F1001914 for ; Thu, 13 Sep 2018 11:25:55 +0000 (UTC) Received: from mxct.zte.com.cn (out1.zte.com.cn [202.103.147.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id AFA9C4ACA4 for ; Thu, 13 Sep 2018 11:25:54 +0000 (UTC) Received: from mse01.zte.com.cn (unknown [10.30.3.20]) by Forcepoint Email with ESMTPS id E9C879CE08BDF1334BB8 for ; Thu, 13 Sep 2018 19:25:51 +0800 (CST) Received: from notes_smtp.zte.com.cn ([10.30.1.239]) by mse01.zte.com.cn with ESMTP id w8DBPfFR051963 for ; Thu, 13 Sep 2018 19:25:41 +0800 (GMT-8) (envelope-from wang.yechao255@zte.com.cn) Received: from kvm-146.zte.com.cn ([10.74.120.146]) by szsmtp06.zte.com.cn (Lotus Domino Release 8.5.3FP6) with ESMTP id 2018091319260074-8824906 ; Thu, 13 Sep 2018 19:26:00 +0800 From: Wang Yechao To: libvir-list@redhat.com Date: Thu, 13 Sep 2018 19:29:51 +0800 Message-Id: <1536838191-30333-1-git-send-email-wang.yechao255@zte.com.cn> X-MIMETrack: Itemize by SMTP Server on SZSMTP06/server/zte_ltd(Release 8.5.3FP6|November 21, 2013) at 2018-09-13 19:26:00, Serialize by Router on notes_smtp/zte_ltd(Release 9.0.1FP7|August 17, 2016) at 2018-09-13 19:25:29, Serialize complete at 2018-09-13 19:25:29 X-MAIL: mse01.zte.com.cn w8DBPfFR051963 X-Greylist: Sender passed SPF test, Sender IP whitelisted by DNSRBL, ACL 212 matched, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Thu, 13 Sep 2018 11:25:54 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Thu, 13 Sep 2018 11:25:54 +0000 (UTC) for IP:'202.103.147.172' DOMAIN:'out1.zte.com.cn' HELO:'mxct.zte.com.cn' FROM:'wang.yechao255@zte.com.cn' RCPT:'' X-RedHat-Spam-Score: -2.301 (RCVD_IN_DNSWL_MED, SPF_PASS) 202.103.147.172 out1.zte.com.cn 202.103.147.172 out1.zte.com.cn X-Scanned-By: MIMEDefang 2.78 on 10.5.110.38 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-loop: libvir-list@redhat.com Cc: Wang Yechao Subject: [libvirt] [PATCH v2] numa: fix unsafe access to numa_nodes_ptr X-BeenThere: libvir-list@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: Development discussions about the libvirt library & tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: libvir-list-bounces@redhat.com Errors-To: libvir-list-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Thu, 13 Sep 2018 11:26:01 +0000 (UTC) X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" numa_nodes_ptr is a global variable in libnuma.so. It is been freed after main thread exits. If we have many running vms, restart the libvirtd service continuously at intervals of a few seconds, the main thread may exit before qemuProcessReconnect thread, and a segfault error occurs. Backstrace as follows: 0 0x00007f40e3d2dd72 in numa_bitmask_isbitset () from /lib64/libnuma.so.1 1 0x00007f40e4d14c55 in virNumaNodeIsAvailable (node=3Dnode@entry=3D0) at = util/virnuma.c:396 2 0x00007f40e4d16010 in virNumaGetHostMemoryNodeset () at util/virnuma.c:1= 011 3 0x00007f40b94ced90 in qemuRestoreCgroupState (vm=3D0x7f407c39df00, vm=3D= 0x7f407c39df00) at qemu/qemu_cgroup.c:877 4 qemuConnectCgroup (driver=3Ddriver@entry=3D0x7f407c21fe80, vm=3D0x7f407c= 39df00) at qemu/qemu_cgroup.c:969 5 0x00007f40b94eef93 in qemuProcessReconnect (opaque=3D) at= qemu/qemu_process.c:3531 6 0x00007f40e4d34bd2 in virThreadHelper (data=3D) at util/v= irthread.c:206 7 0x00007f40e214ee25 in start_thread () from /lib64/libpthread.so.0 8 0x00007f40e1e7c36d in clone () from /lib64/libc.so.6 Signed-off-by: Wang Yechao --- src/util/virnuma.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/util/virnuma.c b/src/util/virnuma.c index 67e6c86..f06f6b3 100644 --- a/src/util/virnuma.c +++ b/src/util/virnuma.c @@ -381,7 +381,10 @@ virNumaGetMaxCPUs(void) bool virNumaNodeIsAvailable(int node) { - return numa_bitmask_isbitset(numa_nodes_ptr, node); + if (numa_nodes_ptr) + return numa_bitmask_isbitset(numa_nodes_ptr, node); + else + return false; } =20 =20 --=20 1.8.3.1 -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list