From owner-dev-commits-src-all@freebsd.org Mon Apr 12 20:58:47 2021 Return-Path: Delivered-To: dev-commits-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 ADA775DEC10; Mon, 12 Apr 2021 20:58:47 +0000 (UTC) (envelope-from git@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 4FK1LH4Mplz4tZn; Mon, 12 Apr 2021 20:58:47 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (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 88B6C1E069; Mon, 12 Apr 2021 20:58:47 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 13CKwlI8017599; Mon, 12 Apr 2021 20:58:47 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 13CKwlRD017598; Mon, 12 Apr 2021 20:58:47 GMT (envelope-from git) Date: Mon, 12 Apr 2021 20:58:47 GMT Message-Id: <202104122058.13CKwlRD017598@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: John Baldwin Subject: git: 89df484739ef - main - iscsi: Kick threads out of iscsi_ioctl() during unload. MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: jhb X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 89df484739efe93b52da467f35255ae538bb946b Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-all@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for all branches of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Apr 2021 20:58:47 -0000 The branch main has been updated by jhb: URL: https://cgit.FreeBSD.org/src/commit/?id=89df484739efe93b52da467f35255ae538bb946b commit 89df484739efe93b52da467f35255ae538bb946b Author: John Baldwin AuthorDate: 2021-04-12 20:56:16 +0000 Commit: John Baldwin CommitDate: 2021-04-12 20:58:21 +0000 iscsi: Kick threads out of iscsi_ioctl() during unload. iscsid can be sleeping in iscsi_ioctl() causing the destroy_dev() to sleep forever if iscsi.ko is unloaded while iscsid is running. Reported by: Jithesh Arakkan @ Chelsio Reviewed by: mav MFC after: 1 week Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D29688 --- sys/dev/iscsi/iscsi.c | 11 +++++++++++ sys/dev/iscsi/iscsi.h | 1 + 2 files changed, 12 insertions(+) diff --git a/sys/dev/iscsi/iscsi.c b/sys/dev/iscsi/iscsi.c index 4367f780d84b..13a35c371c40 100644 --- a/sys/dev/iscsi/iscsi.c +++ b/sys/dev/iscsi/iscsi.c @@ -1333,6 +1333,11 @@ iscsi_ioctl_daemon_wait(struct iscsi_softc *sc, } if (is == NULL) { + if (sc->sc_unloading) { + sx_sunlock(&sc->sc_lock); + return (ENXIO); + } + /* * No session requires attention from iscsid(8); wait. */ @@ -2560,6 +2565,12 @@ static int iscsi_unload(void) { + /* Awaken any threads asleep in iscsi_ioctl(). */ + sx_xlock(&sc->sc_lock); + sc->sc_unloading = true; + cv_signal(&sc->sc_cv); + sx_xunlock(&sc->sc_lock); + if (sc->sc_cdev != NULL) { ISCSI_DEBUG("removing device node"); destroy_dev(sc->sc_cdev); diff --git a/sys/dev/iscsi/iscsi.h b/sys/dev/iscsi/iscsi.h index 80ac9d877107..793b7529c7c0 100644 --- a/sys/dev/iscsi/iscsi.h +++ b/sys/dev/iscsi/iscsi.h @@ -132,6 +132,7 @@ struct iscsi_softc { TAILQ_HEAD(, iscsi_session) sc_sessions; struct cv sc_cv; unsigned int sc_last_session_id; + bool sc_unloading; eventhandler_tag sc_shutdown_pre_eh; eventhandler_tag sc_shutdown_post_eh; };