[Lustre-discuss] recovering formatted OST

Bernd Schubert bernd.schubert at fastmail.fm
Fri Oct 22 04:42:25 PDT 2010


Hmm, e2fsck didn't catch that? rec_len is the length of a directory entry, so 
after how many bytes the next entry follows. You can try to force e2fsck to do 
something about that: e2fsck -D


Cheers,
Bernd


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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