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Date: Fri, 24 Sep 2010 00:15:11 +0000 From: Christoph Anton Mitterer <calestyo@...entia.net> To: <linux-kernel@...r.kernel.org> Subject: strange fs corruptions when doing: virtualbox-image->fuse->losetup->lvm->ext3/4 (on dm-crypted fs) Hi. I seem to have found some very strange problem: Using the following system setup: - Debian sid, except the kernel which is version 2.6.35-1~experimental.3 from experimental using a custom .config (can send in case you need). - The system itself is fully encrypted with dm-crypt/LUKS (booting from an USB stick), on top of it an ext4 filesystem with that Debian. Under that Debian I've installed VirtualBox and created 4 Debian template images, I'm going to use for server installations in the faculty (amd64/i386 each with stable/unstable Debian). The images are on the (dm-crypted) ext4, using the dynamic vdi format. Each Image itself has a msdos parition table, with one partition (sda1) and bootlader in MBR (sda). sda1 (inside the images) are used as LVM PV with, belonging to some VG, providing a LV which contains the root-fs for the images. As filesystem I've used ext3 (on the stable Debians) and ext4 (on the unstables). Inside the VirtualBox, everything seems to be fine (especially the file user/group owner seem to be correct, see later). I then wanted to actually deploy the image on one server and did the following: - stopped the VMs - extracted the contents of the image using virtualbox-ose-fuse): # vdfuse -r -f image.vdi tmp/ # ls tmp/ EntireDisk Partition1 # losetup -f tmp/Partition1 # vgchange -ay # mount /dev/vg_system/root img/ - looking around in the filesystem, e.g. creating a tarball of it or so # ls img/var/lib With ext3 I get the following kernel messages: [ 510.357266] EXT3-fs: barriers not enabled [ 510.370686] Buffer I/O error on device dm-1, logical block 0 [ 510.370960] lost page write due to I/O error on dm-1 [ 510.371214] EXT3-fs (dm-1): using internal journal [ 510.371778] EXT3-fs (dm-1): mounted filesystem with ordered data mode [ 510.372678] kjournald starting. Commit interval 5 seconds [ 530.720143] Buffer I/O error on device dm-1, logical block 1245698 [ 530.720537] lost page write due to I/O error on dm-1 [ 530.720881] Aborting journal on device dm-1. [ 530.721159] ------------[ cut here ]------------ [ 530.721477] WARNING: at fs/buffer.c:1151 mark_buffer_dirty+0x74/0x90() [ 530.721788] Hardware name: LIFEBOOK E8410 [ 530.722069] Modules linked in: ext3 jbd cpufreq_stats fuse nvidia(P) btusb bluetooth joydev pcmcia sdhci_pci sdhci yenta_socket serio_raw pcmcia_rsrc mmc_core pcmcia_core irda ata_generic crc_ccitt tpm_tis tpm ata_piix tpm_bios btrfs crc32c libcrc32c [ 530.727494] Pid: 4951, comm: kjournald Tainted: P 2.6.35-heisenberg #1 [ 530.727865] Call Trace: [ 530.728159] [<ffffffff81047d8b>] ? warn_slowpath_common+0x7b/0xc0 [ 530.728478] [<ffffffff8113fe34>] ? mark_buffer_dirty+0x74/0x90 [ 530.728767] [<ffffffffa008f822>] ? journal_update_superblock+0x82/0xf0 [jbd] [ 530.729069] [<ffffffffa008fa31>] ? __journal_abort_soft+0xb1/0xf0 [jbd] [ 530.729402] [<ffffffffa0091318>] ? journal_put_journal_head+0xb8/0x110 [jbd] [ 530.729696] [<ffffffffa008c67e>] ? journal_commit_transaction+0xa4e/0x12f0 [jbd] [ 530.730094] [<ffffffff81057183>] ? lock_timer_base+0x33/0x70 [ 530.730418] [<ffffffff81057eb6>] ? try_to_del_timer_sync+0x76/0xf0 [ 530.730709] [<ffffffffa0090681>] ? kjournald+0xe1/0x230 [jbd] [ 530.730988] [<ffffffff81066bd0>] ? autoremove_wake_function+0x0/0x30 [ 530.731291] [<ffffffffa00905a0>] ? kjournald+0x0/0x230 [jbd] [ 530.731606] [<ffffffffa00905a0>] ? kjournald+0x0/0x230 [jbd] [ 530.731902] [<ffffffff8106663e>] ? kthread+0x8e/0xa0 [ 530.732200] [<ffffffff81003d14>] ? kernel_thread_helper+0x4/0x10 [ 530.732519] [<ffffffff810665b0>] ? kthread+0x0/0xa0 [ 530.732801] [<ffffffff81003d10>] ? kernel_thread_helper+0x0/0x10 [ 530.733100] ---[ end trace 6bd8a0673ff77673 ]--- [ 530.733436] Buffer I/O error on device dm-1, logical block 1245698 [ 530.733719] lost page write due to I/O error on dm-1 [ 557.994085] EXT3-fs (dm-1): error: ext3_journal_start_sb: Detected aborted journal [ 557.994856] EXT3-fs (dm-1): error: remounting filesystem read-only [ 578.223552] EXT3-fs (dm-1): error: ext3_put_super: Couldn't clean up the journal (point where I unmounted img/) With ext4: Sep 24 02:03:50 heisenberg kernel: [ 1869.089309] Buffer I/O error on device dm-1, logical block 0 Sep 24 02:03:50 heisenberg kernel: [ 1869.089313] lost page write due to I/O error on dm-1 Sep 24 02:03:50 heisenberg kernel: [ 1869.089684] EXT4-fs (dm-1): mounted filesystem with ordered data mode. Opts: (null) Sep 24 02:04:23 heisenberg kernel: [ 1902.720137] Buffer I/O error on device dm-1, logical block 1081344 Sep 24 02:04:23 heisenberg kernel: [ 1902.720146] lost page write due to I/O error on dm-1 Sep 24 02:04:23 heisenberg kernel: [ 1902.720152] JBD2: I/O error detected when updating journal superblock for dm-1-8. Sep 24 02:04:23 heisenberg kernel: [ 1902.720231] Aborting journal on device dm-1-8. Sep 24 02:04:23 heisenberg kernel: [ 1902.720240] Buffer I/O error on device dm-1, logical block 1081344 Sep 24 02:04:23 heisenberg kernel: [ 1902.720245] lost page write due to I/O error on dm-1 Sep 24 02:04:23 heisenberg kernel: [ 1902.720249] JBD2: I/O error detected when updating journal superblock for dm-1-8. Sep 24 02:04:50 heisenberg kernel: [ 1929.144344] EXT4-fs error (device dm-1): ext4_put_super: Couldn't clean up the journal Sep 24 02:04:50 heisenberg kernel: [ 1929.144357] EXT4-fs (dm-1): Remounting filesystem read-only (point where I unmounted img/) An interesting effect is, that the file-data seems to be correct (well at least an image made of a tarball created from img/ booted), but (at least) the user/group owners get corrupted: Take an excerpt from ls -al img/var/lib drwxrwsr-x 2 libuuid crontab 4,1k Aug 8 2009 libuuid drwxr-xr-x 3 root root 4,1k Aug 10 2009 libxml-sax-perl drwxrwx--- 2 privoxy Debian-gdm 4,1k Sep 22 16:44 logcheck drwxr-xr-x 2 root root 4,1k Aug 10 2009 logrotate drwxr-xr-x 2 root root 4,1k Sep 21 12:03 mdadm drwxr-xr-x 2 root root 4,1k Feb 6 2010 misc drwxr-xr-x 2 root root 4,1k Feb 9 2010 mlocate drwxr-xr-x 2 root root 4,1k Sep 20 15:20 msttcorefonts drwxr-xr-x 5 ntp root 4,1k Aug 10 2009 nfs drwxr-xr-x 2 clamav ssh 4,1k Sep 22 16:16 ntp drwxr-xr-x 2 root root 4,1k Jun 12 2009 ntpdate drwxr-xr-x 2 root root 4,1k Sep 21 11:30 pam drwx------ 3 root root 4,1k Feb 6 2010 polkit-1 drwxr-xr-x 2 messagebus ssl-cert 4,1k Aug 11 2009 postfix This should read about like that (and the user/group are correct from inside the VirtualBox): drwxrwsr-x 2 libuuid libuuid 4,1k Aug 8 2009 libuuid drwxr-xr-x 3 root root 4,1k Aug 10 2009 libxml-sax-perl drwxrwx--- 2 logcheck logcheck 4,1k Sep 22 16:44 logcheck drwxr-xr-x 2 root root 4,1k Aug 10 2009 logrotate drwxr-xr-x 2 root root 4,1k Sep 21 12:03 mdadm drwxr-xr-x 2 root root 4,1k Feb 6 2010 misc drwxr-xr-x 2 root root 4,1k Feb 9 2010 mlocate drwxr-xr-x 2 root root 4,1k Sep 20 15:20 msttcorefonts drwxr-xr-x 5 stadt root 4,1k Aug 10 2009 nfs drwxr-xr-x 2 ntp ntp 4,1k Sep 22 16:16 ntp drwxr-xr-x 2 root root 4,1k Jun 12 2009 ntpdate drwxr-xr-x 2 root root 4,1k Sep 21 11:30 pam drwx------ 3 root root 4,1k Feb 6 2010 polkit-1 drwxr-xr-x 2 postfix postfix 4,1k Aug 11 2009 postfix At a first glance it looked (when looking at UIDs/GIDs) that simply the UID was also used as GID (the same number) which don't however correspond to the same user/group pair. But that turned out to be different at a 2nd try. Any ideas? Please ask if you need additional info/etc. Cheers, Chris. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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