From owner-svn-src-head@freebsd.org Mon Aug 12 10:30:01 2019 Return-Path: Delivered-To: svn-src-head@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 875A5AD63C; Mon, 12 Aug 2019 10:30:01 +0000 (UTC) (envelope-from avg@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 466XCs33BCz47Nx; Mon, 12 Aug 2019 10:30:01 +0000 (UTC) (envelope-from avg@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 4B918252C9; Mon, 12 Aug 2019 10:30:01 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x7CAU1oC053609; Mon, 12 Aug 2019 10:30:01 GMT (envelope-from avg@FreeBSD.org) Received: (from avg@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x7CAU11q053608; Mon, 12 Aug 2019 10:30:01 GMT (envelope-from avg@FreeBSD.org) Message-Id: <201908121030.x7CAU11q053608@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: avg set sender to avg@FreeBSD.org using -f From: Andriy Gapon Date: Mon, 12 Aug 2019 10:30:01 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r350894 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs X-SVN-Group: head X-SVN-Commit-Author: avg X-SVN-Commit-Paths: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs X-SVN-Commit-Revision: 350894 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2019 10:30:01 -0000 Author: avg Date: Mon Aug 12 10:30:00 2019 New Revision: 350894 URL: https://svnweb.freebsd.org/changeset/base/350894 Log: a stop gap fix for a race between dnode_hold and dnode_sync_free The race was introduced in r337669, the large dnode feature import from ZoL. The problem was debugged by ZoL developers and then, independently, on FreeBSD. The fix is an early proposal by Brian Behlendorf: https://github.com/behlendorf/zfs/commit/50f32ed74e42aa28522e9681fb8ae55239fa33a7 This fix never went into ZoL. A larger change that was committed later included a different solution because of the re-worked code. Ideally, we want to revert this fix and re-synchronize FreeBSD large dnode code with that in illumos (or newer ZoL). illumos has a later import of the feature from ZoL that does not have the bug. PR: 236480 Obtained from: Brian Behlendorf Submitted by: ncrogers@gmail.com (patch adaptation) Reported by: ncrogers@gmail.com Tested by: ncrogers@gmail.com, Dennis Noordsij , Julien Cigar MFC after: 10 days Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dnode.c Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dnode.c ============================================================================== --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dnode.c Mon Aug 12 10:00:32 2019 (r350893) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dnode.c Mon Aug 12 10:30:00 2019 (r350894) @@ -1324,7 +1324,9 @@ dnode_hold_impl(objset_t *os, uint64_t object, int fla mutex_enter(&dn->dn_mtx); type = dn->dn_type; if (dn->dn_free_txg || - ((flag & DNODE_MUST_BE_FREE) && !refcount_is_zero(&dn->dn_holds))) { + ((flag & DNODE_MUST_BE_ALLOCATED) && type == DMU_OT_NONE) || + ((flag & DNODE_MUST_BE_FREE) && + (type != DMU_OT_NONE || !refcount_is_zero(&dn->dn_holds)))) { mutex_exit(&dn->dn_mtx); zrl_remove(&dnh->dnh_zrlock); dbuf_rele(db, FTAG);