[Lustre-discuss] recovering formatted OST

Bernd Schubert bernd.schubert at fastmail.fm
Fri Oct 22 10:52:11 PDT 2010


Hmm, I would probably format a small fake device on a ramdisk and copy files 
over, run tunefs --writeconf /mdt and then start everything (inlcuding all 
OSTs) again.


Cheers,

On Friday, October 22, 2010, Wojciech Turek wrote:
> I have tried Bernd's suggestion and it seem to have worked, after running
> e2fsck -D ll_recover_lost_found_objs didn't cause kernel panic but moved a
> number of objects to O directory. Problem is that I do not have last_rcvd
> file so the OST has no index at the moment. What would be the next step to
> enable access to those files in the filesystem?
> 
> Best regards,
> 
> Wojciech
> 
> On 22 October 2010 17:15, Andreas Dilger <andreas.dilger at oracle.com> wrote:
> > On 2010-10-22, at 5:42, Bernd Schubert <bernd.schubert at fastmail.fm> wrote:
> > > Hmm, e2fsck didn't catch that? rec_len is the length of a directory
> > 
> > entry, so
> > 
> > > after how many bytes the next entry follows.
> > 
> > I agree that e2fsck should have caught that.
> > 
> > > You can try to force e2fsck to do
> > > something about that: e2fsck -D
> > 
> > No, I would recommend against using -D at this point. That will cause it
> > to re-write the directory contents, and given that the filesystem was
> > previously corrupted I would prefer making as few changes as possible
> > before the data is estranged.
> > 
> > Wojciech,
> > note that if you are able to mount the filesystem you could just copy all
> > of the objects (with xattrs!) from lost+found on the bad filesystem,
> > along with the last_rcvd file (if you can find it) into a new ldiskfs
> > filesystem and then run ll_recover_lost_found_objs on that.
> > 
> > > On Friday, October 22, 2010, Wojciech Turek wrote:
> > >> Ok, removing and recreating the journal fixed that problem and I am
> > >> able
> > 
> > to
> > 
> > >> mount device as ldiskfs filesystem. Now I hit another wall when trying
> > 
> > to
> > 
> > >> run ll_recover_lost_found_objs
> > >> When I first time run ll_recover_lost_found_objs -d
> > >> /mnt/ost/lost+found
> > 
> > it
> > 
> > >> only creates the O dir and exits. When I repeat this command again
> > 
> > kernel
> > 
> > >> panics. Any idea what could be the problem here?
> > >> 
> > >> 
> > >> LDISKFS-fs error (device dm-4): ldiskfs_readdir: bad entry in
> > >> directory #6831: rec_len is smaller than minimal - offset=0, inode=0,
> > >> rec_len=0, name_len=0
> > >> Aborting journal on device dm-4.
> > >> Unable to handle kernel NULL pointer dereference at 0000000000000000
> > 
> > RIP:
> > >> [<ffffffff88033448>] :jbd:journal_commit_transaction+0xc5b/0x12db
> > >> PGD 1a118d067 PUD 1ce7e7067 PMD 0
> > >> Oops: 0002 [1] SMP
> > >> last sysfs file: /class/infiniband_mad/umad0/port
> > >> CPU 3
> > >> Modules linked in: ldiskfs(U) crc16(U) autofs4(U) hidp(U) l2cap(U)
> > >> bluetooth(U) rdma_ucm(U) rdma_cm(U) iw_cm(U) ib_addr(U) ib_ipoib(U)
> > >> ipoib_helper(U) ib_cm(U) ipv6(U) xfrm_nalgo(U) crypto_api(U)
> > 
> > ib_uverbs(U)
> > 
> > >> ib_umad(U) mlx4_vnic(U) mlx4_vnic_helper(U) ib_sa(U) ib_mthca(U)
> > 
> > mptctl(U)
> > 
> > >> dm_mirror(U) video(U) backlight(U) sbs(U) power_meter(U) hwmon(U)
> > 
> > i2c_ec(U)
> > 
> > >> i2c_core(U) dell_wmi(U) wmi(U) button(U) battery(U) asus_acpi(U)
> > >> acpi_memhotplug(U) ac(U) parport_pc(U) lp(U) parport(U) sr_mod(U)
> > 
> > cdrom(U)
> > 
> > >> mlx4_ib(U) ib_mad(U) ib_core(U) joydev(U) mlx4_core(U) usb_storage(U)
> > >> pcspkr(U) shpchp(U) serio_raw(U) i5000_edac(U) edac_mc(U) dm_raid45(U)
> > >> dm_message(U) dm_region_hash(U) dm_log(U) dm_mod(U) dm_mem_cache(U)
> > 
> > nfs(U)
> > 
> > >> lockd(U) fscache(U) nfs_acl(U) sunrpc(U) mptsas(U) mptscsih(U)
> > 
> > mptbase(U)
> > 
> > >> scsi_transport_sas(U) mppVhba(U) megaraid_sas(U) mppUpper(U) sg(U)
> > >> sd_mod(U) scsi_mod(U) bnx2(U) ext3(U) jbd(U) uhci_hcd(U) ohci_hcd(U)
> > >> ehci_hcd(U) Pid: 11360, comm: kjournald Tainted: G
> > >> 2.6.18-194.3.1.el5_lustre.1.8.4 #1
> > >> RIP: 0010:[<ffffffff88033448>]  [<ffffffff88033448>]
> > >> 
> > >> :jbd:journal_commit_transaction+0xc5b/0x12db
> > >> 
> > >> RSP: 0018:ffff8101c6481d90  EFLAGS: 00010246
> > >> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000ffffffff
> > >> RDX: 0000000000000000 RSI: ffff8101e9dab0c0 RDI: ffff81022fa46000
> > >> RBP: ffff81022fa46000 R08: ffff81022fa46068 R09: 0000000000000000
> > >> R10: ffff810105925b20 R11: 00000000fffffffa R12: 0000000000000000
> > >> R13: 0000000000000000 R14: ffff8101e9dab0c0 R15: 0000000000000000
> > >> FS:  0000000000000000(0000) GS:ffff810107b9a4c0(0000)
> > >> knlGS:0000000000000000 CS:  0010 DS: 0018 ES: 0018 CR0:
> > >> 000000008005003b CR2: 0000000000000000 CR3: 00000001eaffb000 CR4:
> > >> 00000000000006e0 Process kjournald (pid: 11360, threadinfo
> > >> ffff8101c6480000, task ffff81021c14c0c0)
> > >> Stack:  ffff8101a61b9000 000000002b8263c0 ffffffff00000000
> > 
> > 0000000000000000
> > 
> > >> 0000113b00000001 0000000000000013 0000000000000000 0000000000000111
> > >> 0000000000000000 0000000000000000 0000000001282dd7 00000000000020dd
> > >> Call Trace:
> > >> [<ffffffff8003da91>] lock_timer_base+0x1b/0x3c
> > >> [<ffffffff8004b347>] try_to_del_timer_sync+0x7f/0x88
> > >> [<ffffffff88037386>] :jbd:kjournald+0xc1/0x213
> > >> [<ffffffff800a0ab2>] autoremove_wake_function+0x0/0x2e
> > >> [<ffffffff800a089a>] keventd_create_kthread+0x0/0xc4
> > >> [<ffffffff880372c5>] :jbd:kjournald+0x0/0x213
> > >> [<ffffffff800a089a>] keventd_create_kthread+0x0/0xc4
> > >> [<ffffffff80032890>] kthread+0xfe/0x132
> > >> [<ffffffff8005dfb1>] child_rip+0xa/0x11
> > >> [<ffffffff800a089a>] keventd_create_kthread+0x0/0xc4
> > >> [<ffffffff8014bcf4>] deadline_queue_empty+0x0/0x23
> > >> [<ffffffff80032792>] kthread+0x0/0x132
> > >> [<ffffffff8005dfa7>] child_rip+0x0/0x11
> > >> 
> > >> 
> > >> Code: f0 0f ba 33 01 e8 42 fc 02 f8 8b 03 a8 04 75 07 8b 43 58 85
> > >> RIP  [<ffffffff88033448>] :jbd:journal_commit_transaction+0xc5b/0x12db
> > >> RSP <ffff8101c6481d90>
> > >> CR2: 0000000000000000
> > >> <0>Kernel panic - not syncing: Fatal exception
> > >> 
> > >> On 22 October 2010 03:09, Andreas Dilger <andreas.dilger at oracle.com>
> > 
> > wrote:
> > >>> On 2010-10-21, at 18:44, Wojciech Turek <wjt27 at cam.ac.uk> wrote:
> > >>> 
> > >>> fsck has finished and does not find any more errors to correct.
> > >>> However when I try to mount the device as ldiskfs kernel panics with
> > >>> following message:
> > >>> 
> > >>> Assertion failure in cleanup_journal_tail() at
> > >>> fs/jbd/checkpoint.c:459: "blocknr != 0"
> > >>> 
> > >>> 
> > >>> Hmm, not sure, maybe your journal is broken?  You can delete it with
> > >>> "tune2fs -O ^has_journal" (maybe after running e2fsck again to clear
> > 
> > the
> > 
> > >>> journal), then re-create it with "tune2fs -j".
> > >>> 
> > >>> ----------- [cut here ] --------- [please bite here ] ---------
> > >>> Kernel BUG at fs/jbd/checkpoint.c:459
> > >>> invalid opcode: 0000 [1] SMP
> > >>> last sysfs file: /class/infiniband_mad/umad0/
> > >>> port
> > >>> CPU 2
> > >>> Modules linked in: obdfilter(U) fsfilt_ldiskfs(U) ost(U) mgc(U)
> > >>> ldiskfs(U) crc16(U) lustre(U) lov(U) mdc(U) lquota(U) osc(U)
> > 
> > ksocklnd(U)
> > 
> > >>> ko2iblnd(U) ptlrpc(U) obdclass(U) lnet(U) lvfs(U) libcfs(U)
> > >>> autofs4(U) hidp(U) l2cap(U) bluetooth(U) rdma_ucm(U) rdma_cm(U)
> > >>> iw_cm(U)
> > 
> > ib_addr(U)
> > 
> > >>> ib_ipoib(U) ipoib_helper(U) ib_cm(U) ipv6(U) xfrm_nalgo(U)
> > 
> > crypto_api(U)
> > 
> > >>> ib_uverbs(U) ib_umad(U) mlx4_vnic(U) mlx4_vnic_helper(U) ib_sa(U)
> > >>> ib_mthca(U) mptctl(U) dm_mirror(U) video(U) backlight(U) sbs(U)
> > >>> power_meter(U) hwmon(U) i2c_ec(U) i2c_core(U) dell_wmi(U) wmi(U)
> > >>> button(U) battery(U) asus_acpi(U) acpi_memhotplug(U) ac(U)
> > 
> > parport_pc(U)
> > 
> > >>> lp(U) parport(U) sr_mod(U) cdrom(U) mlx4_ib(U) ib_mad(U) ib_core(U)
> > >>> joydev(U) mlx4_core(U) usb_storage(U) shpchp(U) i5000_edac(U)
> > 
> > edac_mc(U)
> > 
> > >>> serio_raw(U) pcspkr(U) dm_raid45(U) dm_message(U) dm_region_hash(U)
> > >>> dm_log(U) dm_mod(U) dm_mem_cache(U) nfs(U) lockd(U) fscache(U)
> > >>> nfs_acl(U) sunrpc(U) mptsas(U) mptscsih(U) mptbase(U)
> > >>> scsi_transport_sas(U) mppVhba(U) megaraid_sas(U) mppUpper(U) sg(U)
> > >>> sd_mod(U) scsi_mod(U) bnx2(U) ext3(U) jbd(U) uhci_hcd(U) ohci_hcd(U)
> > >>> ehci_hcd(U) Pid: 13891, comm: mount Tainted: G
> > >>> 2.6.18-194.3.1.el5_lustre.1.8.4 #1 RIP: 0010:[<ffffffff88034a95>]
> > >>> [<ffffffff88034a95>]
> > >>> 
> > >>> :jbd:cleanup_journal_tail+0x9d/0x118
> > >>> 
> > >>> RSP: 0018:ffff81016f00da68  EFLAGS: 00010286
> > >>> RAX: 000000000000005a RBX: ffff81012ca12c00 RCX: ffffffff80311da8
> > >>> RDX: ffffffff80311da8 RSI: 0000000000000000 RDI: ffffffff80311da0
> > >>> RBP: 0000000000000000 R08: ffffffff80311da8 R09: 0000000000000001
> > >>> R10: 0000000000000000 R11: 0000000000000080 R12: 0000000000000002
> > >>> R13: ffff81012ca12d4c R14: ffff81012ca12c24 R15: ffff81017a8d7400
> > >>> FS:  00002abd7cef1f70(0000) GS:ffff810107b9acc0(0000)
> > >>> knlGS:0000000000000000
> > >>> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> > >>> CR2: 000000000042b000 CR3: 000000012813f000 CR4: 00000000000006e0
> > >>> Process mount (pid: 13891, threadinfo ffff81016f00c000, task
> > >>> ffff81022e1b7820)
> > >>> Stack:  0000000000000000 ffff81012ca12c00 ffff81017a8d7400
> > >>> ffffffff88037690
> > >>> 
> > >>> ffff81012ca12c00 ffff8102034ff000 ffff81017a8d7400 0000000000000000
> > >>> ffff8102034ff000 ffffffff88a9be56 0000000001000000 ffff8101bf788000
> > >>> 
> > >>> Call Trace:
> > >>> [<ffffffff88037690>] :jbd:journal_flush+0xbe/0x248
> > >>> [<ffffffff88a9be56>]
> > >>> :ldiskfs:ldiskfs_mark_recovery_complete+0x36/0x90
> > >>> [<ffffffff88aa02e0>] :ldiskfs:ldiskfs_fill_super+0x1790/0x1950
> > >>> [<ffffffff800eccd2>] get_filesystem+0x12/0x3b
> > >>> [<ffffffff800e343e>] test_bdev_super+0x0/0xd
> > >>> [<ffffffff88a9eb50>] :ldiskfs:ldiskfs_fill_super+0x0/0x1950
> > >>> [<ffffffff800e43fd>] get_sb_bdev+0x10a/0x16c
> > >>> [<ffffffff800e3d9a>] vfs_kern_mount+0x93/0x11a
> > >>> [<ffffffff800e3e63>] do_kern_mount+0x36/0x4d
> > >>> [<ffffffff800ee601>] do_mount+0x6a9/0x719
> > >>> [<ffffffff800090d2>] __handle_mm_fault+0x96f/0xfaa
> > >>> [<ffffffff8002c9e0>] mntput_no_expire+0x19/0x89
> > >>> [<ffffffff8000a72a>] __link_path_walk+0xf1e/0xf42
> > >>> [<ffffffff800220ce>] __up_read+0x19/0x7f
> > >>> [<ffffffff80066b88>] do_page_fault+0x4fe/0x874
> > >>> [<ffffffff8002c9e0>] mntput_no_expire+0x19/0x89
> > >>> [<ffffffff8000ea45>] link_path_walk+0xa6/0xb2
> > >>> [<ffffffff800cc329>] zone_statistics+0x3e/0x6d
> > >>> [<ffffffff8000f2cf>] __alloc_pages+0x78/0x308
> > >>> [<ffffffff8004c68e>] sys_mount+0x8a/0xcd
> > >>> [<ffffffff8005d28d>] tracesys+0xd5/0xe0
> > >>> 
> > >>> Code: 0f 0b 68 3a 94 03 88 c2 cb 01 44 39 a3 58 01 00 00 75 0e c7
> > >>> RIP  [<ffffffff88034a95>] :jbd:cleanup_journal_tail+0x9d/0x118
> > >>> 
> > >>> RSP <ffff81016f00da68>
> > >>> <0>Kernel panic - not syncing: Fatal exception
> > >>> 
> > >>> Any idea how to fix this?
> > >>> 
> > >>> Many thanks
> > >>> 
> > >>> Wojciech
> > >>> 
> > >>> 
> > >>> On 21 October 2010 17:54, Wojciech Turek < <wjt27 at cam.ac.uk>
> > >>> 
> > >>> wjt27 at cam.ac.uk> wrote:
> > >>>> Thanks Ken, that worked.
> > >>>> 
> > >>>> 
> > >>>> On 21 October 2010 17:39, Ken Hornstein < <kenh at cmf.nrl.navy.mil>
> > >>>> 
> > >>>> kenh at cmf.nrl.navy.mil> wrote:
> > >>>>>> Now I have another problem. After last segfault I can not restart
> > 
> > the
> > 
> > >>>>> fsck
> > >>>>> 
> > >>>>>> due to MMP.
> > >>>>>> [...]
> > >>>>>> Also when I try to access filesystem via debugfs it fails:
> > >>>>>> 
> > >>>>>> debugfs -c -R 'ls' /dev/scratch2_ost16vg/ost16lv
> > >>>>>> debugfs 1.41.10.sun2 (24-Feb-2010)
> > >>>>>> /dev/scratch2_ost16vg/ost16lv: MMP: fsck being run while opening
> > >>>>> 
> > >>>>> filesystem
> > >>>>> 
> > >>>>>> ls: Filesystem not open
> > >>>>>> 
> > >>>>>> Is there a way to clear teh MMP flag so it allows fsck to run?
> > >>>>> 
> > >>>>> You want tune2fs -f -E clear-mmp
> > >>>>> 
> > >>>>> --Ken




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