From owner-svn-src-all@freebsd.org Tue Oct 22 18:05:16 2019 Return-Path: Delivered-To: svn-src-all@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 3F2FF16100A; Tue, 22 Oct 2019 18:05:16 +0000 (UTC) (envelope-from glebius@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 46yLyN0x8Nz46R5; Tue, 22 Oct 2019 18:05:16 +0000 (UTC) (envelope-from glebius@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 035CF18212; Tue, 22 Oct 2019 18:05:16 +0000 (UTC) (envelope-from glebius@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x9MI5Fnt024098; Tue, 22 Oct 2019 18:05:15 GMT (envelope-from glebius@FreeBSD.org) Received: (from glebius@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x9MI5FQr024097; Tue, 22 Oct 2019 18:05:15 GMT (envelope-from glebius@FreeBSD.org) Message-Id: <201910221805.x9MI5FQr024097@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: glebius set sender to glebius@FreeBSD.org using -f From: Gleb Smirnoff Date: Tue, 22 Oct 2019 18:05:15 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r353896 - head/sys/kern X-SVN-Group: head X-SVN-Commit-Author: glebius X-SVN-Commit-Paths: head/sys/kern X-SVN-Commit-Revision: 353896 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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: Tue, 22 Oct 2019 18:05:16 -0000 Author: glebius Date: Tue Oct 22 18:05:15 2019 New Revision: 353896 URL: https://svnweb.freebsd.org/changeset/base/353896 Log: Allow epoch tracker to use the very last byte of the stack. Not sure this will help to avoid panic in this function, since it will also use some stack, but makes code more strict. Submitted by: hselasky Modified: head/sys/kern/subr_epoch.c Modified: head/sys/kern/subr_epoch.c ============================================================================== --- head/sys/kern/subr_epoch.c Tue Oct 22 17:22:10 2019 (r353895) +++ head/sys/kern/subr_epoch.c Tue Oct 22 18:05:15 2019 (r353896) @@ -369,7 +369,7 @@ _epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et MPASS(epoch->e_flags & EPOCH_PREEMPT); td = curthread; MPASS((vm_offset_t)et >= td->td_kstack && - (vm_offset_t)et + sizeof(struct epoch_tracker) < + (vm_offset_t)et + sizeof(struct epoch_tracker) <= td->td_kstack + td->td_kstack_pages * PAGE_SIZE); INIT_CHECK(epoch);