[Lustre-discuss] recovering formatted OST

Andreas Dilger andreas.dilger at oracle.com
Thu Oct 21 19:09:42 PDT 2010



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> wrote:
> Thanks Ken, that worked.
> 
> 
> On 21 October 2010 17:39, Ken Hornstein <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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