From mboxrd@z Thu Jan 1 00:00:00 1970 From: Martin Steigerwald Subject: Re: 3.2-rc4: scrubbing locks up the kernel, then hung tasks on boot Date: Sat, 17 Mar 2012 10:43:25 +0100 Message-ID: <201203171043.25660.Martin@lichtvoll.de> References: <201112171833.34720.Martin@lichtvoll.de> <20120315174245.GV19217@shiny> <201203161605.47792.Martin@lichtvoll.de> (sfid-20120316_160919_841295_64D691DA) Mime-Version: 1.0 Content-Type: Text/Plain; charset=utf-8 Cc: Chris Mason , Arne Jansen , stable@kernel.org, "Greg Kroah-Hartman" To: linux-btrfs@vger.kernel.org Return-path: In-Reply-To: <201203161605.47792.Martin@lichtvoll.de> List-ID: Hi Greg, Chris, Arne, hi everyone, Am Freitag, 16. M=C3=A4rz 2012 schrieb Martin Steigerwald: > Am Donnerstag, 15. M=C3=A4rz 2012 schrieb Chris Mason: > > On Thu, Mar 15, 2012 at 06:32:19PM +0100, Martin Steigerwald wrote: > > > Am Samstag, 25. Februar 2012 schrieb Arne Jansen: > > > > On 02/24/12 16:51, Martin Steigerwald wrote: > > > > > Am Samstag, 21. Januar 2012 schrieb Martin Steigerwald: > > > > >> Am Samstag, 21. Januar 2012 schrieb Martin Steigerwald: > > > > >>> I still have this with 3.2.0-1-pae - which is a debian kern= el > > > > >>> based on 3.2.1. > > > > >>>=20 > > > > >>> When I do btrfs scrub start / the machine locks immediately > > > > >>> up hard. > > > > >>>=20 > > > > >>> Then usually on next boot it stops on space_cache enabled > > > > >>> message, but not the one for /, but the one for /home whic= h > > > > >>> is mounted later. >=20 > [=E2=80=A6] >=20 > > > > >> I now tested scrubbing /home which is a different BTRFS > > > > >> filesystem on the same machine. > > > > >>=20 > > > > >> Then the scrub is started, scrub status tells me so, but > > > > >> nothing happens, no block in/out activity in vmstat, no CPU > > > > >> related activity in top. > > > > >>=20 > > > > >> btrfs scrub cancel then hangs, but not the complete machine, > > > > >> only the process. > > > > >>=20 > > > > >> I had this once on my T520 with the internal Intel SSD 320 a= s > > > > >> well. The other time it worked. > > > > >>=20 > > > > >> Well maybe that is due to BTRFS doing something else on my T= 23 > > > > >> now: > > > > >>=20 > > > > >> deepdance:~> ps aux | grep ino-cache | grep -v grep > > > > >> root 1992 5.5 0.0 0 0 ? D 12:15 =20 > > > > >> 0:09 [btrfs- ino-cache] >=20 > [=E2=80=A6] >=20 > > > > >> At least it doesn=C2=B4t lock up hard, so there might really= be > > > > >> something strange with /. > > > > >=20 > > > > > FWIW a btrfs filesystem balance / does work. After this a btr= fs > > > > > scrub start / still locks the kernel. > > > >=20 > > > > Hi Martin, > > > >=20 > > > > I just sent 2 patches to the list. Could you please test if the= se > > > > fix your problem with scrub? > > >=20 > > > I didn=C2=B4t yet test it but I tried the first balance then scru= b stuff > >=20 > > > again: > > Looks like you're on a 32 bit machine. The current for-linus branc= h > > has an important fix for scrub on 32 bit that should solve this. >=20 > So finally - the machine did make-kpkg over night and complained abou= t > missing Documentation lguest, then I switched off lots from distro > default config and just did the usual make stuff - I was able to scru= b > both partitions on that ThinkPad T23: >=20 > deepdance:~> btrfs scrub status / > scrub status for 2bf5b1dc-1d89-4f0d-a561-1a5551a27275 > scrub started at Fri Mar 16 11:56:12 2012 and finished after > 741 seconds total bytes scrubbed: 9.62GB with 0 errors >=20 > deepdance:~> btrfs scrub status /home > scrub status for a600de65-e1ab-4cbf-b150-bbaeaf9fa98d > scrub started at Fri Mar 16 12:00:31 2012 and finished after > 1708 seconds total bytes scrubbed: 36.63GB with 0 errors >=20 > Thanks a lot for fixing this. >=20 > Tested-by: Martin Steigerwald [=E2=80=A6] Would that patch Btrfs: fix casting error in scrub reada code http://git.kernel.org/?p=3Dlinux/kernel/git/mason/linux- btrfs.git;a=3Dcommit;h=3Da175423c831ea582c06784d1e172d2ce1d79923a (sorry for line break. KMail insists on it even when I disable line bre= aks=20 due to the minus sign in the URL.) that I tested above be something for stable? To my knowledge Debian Wheezy and Ubuntu 12.04 LTS will have 3.2. Thanks, --=20 Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" = in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html