From owner-freebsd-current@freebsd.org Wed Jul 12 20:20:57 2017 Return-Path: Delivered-To: freebsd-current@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 8B8EDDA2C8A for ; Wed, 12 Jul 2017 20:20:57 +0000 (UTC) (envelope-from peter@wemm.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id 73DED76631 for ; Wed, 12 Jul 2017 20:20:57 +0000 (UTC) (envelope-from peter@wemm.org) Received: by mailman.ysv.freebsd.org (Postfix) id 72F95DA2C87; Wed, 12 Jul 2017 20:20:57 +0000 (UTC) Delivered-To: current@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 727F0DA2C86 for ; Wed, 12 Jul 2017 20:20:57 +0000 (UTC) (envelope-from peter@wemm.org) Received: from smtp2.wemm.org (smtp2.wemm.org [IPv6:2001:470:67:39d::78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "smtp2.wemm.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 5F27676630 for ; Wed, 12 Jul 2017 20:20:57 +0000 (UTC) (envelope-from peter@wemm.org) Received: from overcee.wemm.org (canning.wemm.org [192.203.228.65]) by smtp2.wemm.org (Postfix) with ESMTP id B550E6AE for ; Wed, 12 Jul 2017 13:20:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=wemm.org; s=m20140428; t=1499890856; bh=FTiHsZG8g9Vk3rMKiomHgArf86ZZ4ehFLiWJ6tp/NuQ=; h=From:To:Subject:Date; b=KTveJgJvscFHloOvaqDeJhhscE5KrNTjgngmwWfDU0pfpTGRsreW7VGisoqvMq0tF Hbh8S5eHzal6SZaDZkGy2htQgvHE2aQFQ8bsxPzOOM0SqugKsuxJwADZaUZxy1N85e YW7enmztMCqP8PPkShdLWY9g2x9lBbOSUwIr7pRI= From: Peter Wemm To: Current Subject: Caveat emptor: Beware of ZFS on HEAD Date: Wed, 12 Jul 2017 13:20:55 -0700 Message-ID: <2830123.MIUbdsJfkU@overcee.wemm.org> User-Agent: KMail/4.14.10 (FreeBSD/12.0-CURRENT; KDE/4.14.10; amd64; ; ) MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart2313450.qoWcZDlQWb"; micalg="pgp-sha256"; protocol="application/pgp-signature" X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Jul 2017 20:20:57 -0000 --nextPart2313450.qoWcZDlQWb Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" We mostly run HEAD in the freebsd.org cluster. Sometime in the last fe= w weeks=20 an ugly zfs problem has surfaced. If a redundant volume is degraded, zf= s=20 panics on boot. If a drive fails while running, or is manually put off= line, zfs=20 panics the same way. I do not have a smoking gun, but I am suspicious of the June 28th commi= ts=20 (starting at r320156) and their follow-ups. eg: r320452. https://bugs.freebsd.org/220691 I believe single disk systems will *not* be affected by this - the pani= c only=20 happens when a raidz (and presumably mirror) degrades. Your laptop etc= should=20 be fine. I apologize for being vague - I do not know more. Folks running HEAD sh= ould=20 take appropritate precautions (eg: keeping a known-good kernel.old and = modules=20 around). This is always advisable when running HEAD anyway, particular= ly so=20 now. For us, a kernel.old from June 18th worked fine. =2D-=20 Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com; KI= 6FJV UTF-8: for when a ' or ... just won\342\200\231t do\342\200\246 --nextPart2313450.qoWcZDlQWb Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. Content-Transfer-Encoding: 7Bit -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEBgrA0Vr/vfNVuPoUNdaXCeyAngQFAllmhKcACgkQNdaXCeyA ngQbVwgAwFUY7+xntVLNfUgK3SchTvxkDCMXO0YecLmdFHCtWSeuxpvV+EUJoOs7 hnZXy7IxRTh92F9g3dRh4M9ifsgE7ubgD/o/vcDR0uprsBQVEUECTaVL9sTRwm6A 9eyVKHnfiB3YmT7GdQCW45zyYotXLJ6vDb4m322V8tgonMv9k1lmIqQfYy6tpFyO YOwlVWBEc+9XcjQIys5t0ZkNinzv0wP+rv89fYBRsx1W4byY33oi6KikQ2ccT7VB eBM509hLoaFlSgcxIe+kZ6pssMAEqhQ+ADD7uggnTMylnxNwH0zflV0u42jOZiQX 1aCc10De/RvTfj4jFXCFRfxFV4qptw== =XwTW -----END PGP SIGNATURE----- --nextPart2313450.qoWcZDlQWb--