From owner-freebsd-bugs@freebsd.org  Sat Sep  2 20:54:58 2017
Return-Path: <owner-freebsd-bugs@freebsd.org>
Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 65F27E03DD8
 for <freebsd-bugs@mailman.ysv.freebsd.org>;
 Sat,  2 Sep 2017 20:54:58 +0000 (UTC)
 (envelope-from bugzilla-noreply@freebsd.org)
Received: from kenobi.freebsd.org (kenobi.freebsd.org
 [IPv6:2001:1900:2254:206a::16:76])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 53176704AD
 for <freebsd-bugs@FreeBSD.org>; Sat,  2 Sep 2017 20:54:58 +0000 (UTC)
 (envelope-from bugzilla-noreply@freebsd.org)
Received: from bugs.freebsd.org ([127.0.1.118])
 by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v82KswTF013588
 for <freebsd-bugs@FreeBSD.org>; Sat, 2 Sep 2017 20:54:58 GMT
 (envelope-from bugzilla-noreply@freebsd.org)
From: bugzilla-noreply@freebsd.org
To: freebsd-bugs@FreeBSD.org
Subject: [Bug 222007] Deadlock at shutdown time between zfs and usb when
 using usb stick as cache device
Date: Sat, 02 Sep 2017 20:54:58 +0000
X-Bugzilla-Reason: AssignedTo
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 10.3-STABLE
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: Affects Only Me
X-Bugzilla-Who: bsdpr@phoe.frmug.org
X-Bugzilla-Status: New
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: ---
X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform
 op_sys bug_status bug_severity priority component assigned_to reporter
Message-ID: <bug-222007-8@https.bugs.freebsd.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: freebsd-bugs@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: Bug reports <freebsd-bugs.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-bugs>,
 <mailto:freebsd-bugs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-bugs/>
List-Post: <mailto:freebsd-bugs@freebsd.org>
List-Help: <mailto:freebsd-bugs-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
 <mailto:freebsd-bugs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 02 Sep 2017 20:54:58 -0000

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222007

            Bug ID: 222007
           Summary: Deadlock at shutdown time between zfs and usb when
                    using usb stick as cache device
           Product: Base System
           Version: 10.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: bsdpr@phoe.frmug.org

Situation: system is booting from a zfs pool configured with two usb sticks=
 as
L2 cache devices.

Observation: at shutdown time, after hard-disks are stoped and uptime durat=
ion
is printed, usual usb shutdown messages are not printed and the system never
powers itself off. When the same sticks are pluged in the same host but are=
 not
part of the root pool, the system goes to power off as usual.

I suppose there is a deadlock between zfs and usb: zfs keeps references to
those two devices and usb waits for the devices to be liberated before wind=
ing
down.

--=20
You are receiving this mail because:
You are the assignee for the bug.=