From mboxrd@z Thu Jan 1 00:00:00 1970 From: Austin S Hemmelgarn Subject: Re: [Bug 100491] New: Oops under bitmap_start_sync [md_mod] at boot Date: Mon, 29 Jun 2015 08:28:24 -0400 Message-ID: <559139E8.9020008@gmail.com> References: <12832_1435266173_558C6C7D_12832_48_1_bug-100491-1606@https.bugzilla.kernel.org/> <20150628205347.GA18403@sli.dy.fi> Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms020208050405080900030001" Return-path: In-Reply-To: <20150628205347.GA18403@sli.dy.fi> Sender: linux-raid-owner@vger.kernel.org To: Sami Liedes , Goldwyn Rodrigues , Neil Brown , bugzilla-daemon@bugzilla.kernel.org Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-raid.ids This is a cryptographically signed message in MIME format. --------------ms020208050405080900030001 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-06-28 16:53, Sami Liedes wrote: > On Thu, Jun 25, 2015 at 09:02:45PM +0000, bugzilla-daemon@bugzilla.kern= el.org wrote: >> https://bugzilla.kernel.org/show_bug.cgi?id=3D100491 >> >> Bug ID: 100491 >> Summary: Oops under bitmap_start_sync [md_mod] at boot > [...] >> Reading all physical valumes. This may take a while... >> Found volume group "rootvg" using metadata type lvm2 >> device-mapper: raid: Device 0 specified for rebuild: Clearing superblo= ck >> md/raid1:mdX: active with 1 out of 2 mirrors >> mdX: invalid bitmap file superblock: bad magic >> md-cluster module not found. >> mdX: Could not setup cluster service (256) >> BUG: unable to handle kernel NULL pointer dereference at 0000000000000= 100 >> IP: [] _raw_spin_lock_irq+0x29/0x70 >> PGD 0 >> Oops: 0002 [#1] PREEMPT SMP > [...] > > I'm marking this as a regression in bugzilla, since this seems to > prevent booting on 4.1.0 at least in certain circumstances (namely > those which I have; I wonder if any raid1 recovery works?) while 4.0.6 > boots correctly. I can confirm having the same issue with the MD code being used through=20 dm-raid. > > I bisected this down to one of four commits. Well, assuming that the > problem was caused by changes in drivers/md; a fair assumption, I > think. The commits are: > > $ git bisect view --oneline > f9209a3 bitmap_create returns bitmap pointer > 96ae923 Gather on-going resync information of other nodes > 54519c5 Lock bitmap while joining the cluster > b97e9257 Use separate bitmaps for each nodes in the cluster My own bisect turned up the same set of commits, although I wouldn't=20 have the time to go any further with it until next weekend. > > The crash happens whether or not CONFIG_MD_CLUSTER is enabled. 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