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Date: Sat, 09 May 2009 12:50:43 -0600
From: Andreas Dilger <adilger@....com>
To: Don Bowman <don@...dvine.com>
Cc: linux-ext4@...r.kernel.org
Subject: Re: ext4 corruption on md [7x1TB in RAID5]
On May 09, 2009 13:14 -0400, Don Bowman wrote:
> I cleanly shut down my system, and when it came back up, this was
> reported:
>
> * Checking file systems...
> Sat May 9 13:00:53 2009
>
> fsck 1.41.4 (27-Jan-2009)
> fsck.ext4: Unable to resolve
> 'UUID=52e18bf7-cbe9-4f58-824c-5c943dd074de'^M
> fsck died with exit status 8
>
> For some reason it thinks it is ext2:
>
> root@...ver:/var/log/fsck# fsck -n /dev/md0 | head -5
> fsck 1.41.4 (27-Jan-2009)
> e2fsck 1.41.4 (27-Jan-2009)
> fsck.ext2: Group descriptors look bad... trying backup blocks...
> Inode table for group 0 is not in group. (block 3251545658)
> WARNING: SEVERE DATA LOSS POSSIBLE.
> Relocate? No
Looks like the beginning of your disk is corrupted/overwritten.
It is strange that the backup descriptors didn't have something
more sane... Hmm, it looks like e2fsck isn't so great at trying
the backup group descriptors when there is a problem. It checks
the superblock, and assumes the group descriptors are OK and/or
need to be fixed.
It would probably be very useful if e2fsck verified the superblock
and group descriptors separately and/or printed a message like:
"group descriptors in group M corrupted, trying backup group N.
Run 'e2fsck -b {blocksize} -B (N * 32768)' to try a different group".
Ideally it would just try until it finds a group that has no errors.
Alternately, picking some backup group in the middle of the filesystem
is probably the safest place, instead of starting at the beginning of
the disk.
> Upon investigation, i'm not sure what to do. I really don't want to lose
> the data on this disk as it will take ages to rebuild (like weeks!).
>
> The system has been in operation for about 2-3months. The data on the
> disk is mostly video + some virtual machines.
>
> Any suggestions for repairing it? I have not done any repairs so far.
> Should i just Run fsck.ext4? Is there something i should try?
If you have the ability, make a backup copy of the full device first
using "dd" to copy everything. If your data is worth more than maybe
$500 then it justifies going out and buying a duplicate RAID setup.
You can use it for holding proper backups later...
Then, after you've done the backup, run "e2fsck -f -b (32768 * i) -B 4096",
where "i" is one of 1, 3, 5, 7, 9, 25, 27, 49, 81, 125, ... 3^n, 5^n, 7^n
to select a backup group explicitly. Using a higer numbered backup group
is probably safer than group 1 or 3 (if there was corruption at the start
of your disk).
> root@...ver:/var/log/fsck# uname -a
> Linux server 2.6.28-12-server #43-Ubuntu SMP Fri May 1 20:22:39 UTC 2009
> x86_64 GNU/Linux
>
> root@...ver:/var/log/fsck# fsck.ext4 -n /dev/md0 | head -5
> e2fsck 1.41.4 (27-Jan-2009)
> fsck.ext4: Group descriptors look bad... trying backup blocks...
> Inode table for group 0 is not in group. (block 3251545658)
> WARNING: SEVERE DATA LOSS POSSIBLE.
> Relocate? No
>
> root@...ver:~# mdadm --detail /dev/md0
> /dev/md0:
> Version : 00.90
> Creation Time : Sun Mar 15 12:15:20 2009
> Raid Level : raid5
> Array Size : 5860574976 (5589.08 GiB 6001.23 GB)
> Used Dev Size : 976762496 (931.51 GiB 1000.20 GB)
> Raid Devices : 7
> Total Devices : 7
> Preferred Minor : 0
> Persistence : Superblock is persistent
>
> Update Time : Sat May 9 12:42:47 2009
> State : clean
> Active Devices : 7
> Working Devices : 7
> Failed Devices : 0
> Spare Devices : 0
>
> Layout : left-symmetric
> Chunk Size : 64K
>
> UUID : c589dbe9:8dfff933:01f9e43d:ac30fbff (local to host
> server)
> Events : 0.305524
>
> Number Major Minor RaidDevice State
> 0 8 0 0 active sync /dev/sda
> 1 8 16 1 active sync /dev/sdb
> 2 8 32 2 active sync /dev/sdc
> 3 8 64 3 active sync /dev/sde
> 4 8 80 4 active sync /dev/sdf
> 5 8 96 5 active sync /dev/sdg
> 6 8 112 6 active sync /dev/sdh
> root@...ver:~#
>
>
> root@...ver:/var/log/fsck# dumpe2fs /dev/md0 |head -60
> dumpe2fs 1.41.4 (27-Jan-2009)
> ext2fs_read_bb_inode: Invalid argument
> Filesystem volume name: <none>
> Last mounted on: <not available>
> Filesystem UUID: 52e18bf7-cbe9-4f58-824c-5c943dd074de
> Filesystem magic number: 0xEF53
> Filesystem revision #: 1 (dynamic)
> Filesystem features: ext_attr resize_inode dir_index filetype
> extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink
> extra_isize
> Filesystem flags: signed_directory_hash
> Default mount options: (none)
> Filesystem state: not clean with errors
> Errors behavior: Continue
> Filesystem OS type: Linux
> Inode count: 366288896
> Block count: 1465143744
> Reserved block count: 73257187
> Free blocks: 1041313557
> Free inodes: 366151494
> First block: 0
> Block size: 4096
> Fragment size: 4096
> Reserved GDT blocks: 674
> Blocks per group: 32768
> Fragments per group: 32768
> Inodes per group: 8192
> Inode blocks per group: 512
> Flex block group size: 16
> Filesystem created: Sun Mar 15 12:17:10 2009
> Last mount time: Wed Apr 22 19:04:50 2009
> Last write time: Sat May 9 12:31:43 2009
> Mount count: 9
> Maximum mount count: 29
> Last checked: Sun Mar 15 12:17:10 2009
> Check interval: 15552000 (6 months)
> Next check after: Fri Sep 11 12:17:10 2009
> Reserved blocks uid: 0 (user root)
> Reserved blocks gid: 0 (group root)
> First inode: 11
> Inode size: 256
> Required extra isize: 28
> Desired extra isize: 28
> Default directory hash: half_md4
> Directory Hash Seed: 49785c19-388f-444c-977a-886c147a8ae6
> Journal backup: inode blocks
>
> Group 0: (Blocks 0-32767)
> Checksum 0x70e6, unused inodes 34168
> Primary superblock at 0, Group descriptors at 1-350
> Reserved GDT blocks at 351-1024
> Block bitmap at 98318778 (+98318778), Inode bitmap at 837719297
> (+837719297)
> Inode table at 3251545658-3251546169 (+3251545658)
> 58662 free blocks, 33159 free inodes, 56553 directories, 34168 unused
> inodes
> Group 1: (Blocks 32768-65535) [INODE_UNINIT, ITABLE_ZEROED]
> Checksum 0x6275, unused inodes 29973
> Backup superblock at 32768, Group descriptors at 32769-33118
> Reserved GDT blocks at 33119-33792
> Block bitmap at 1123273429 (+1123240661), Inode bitmap at 3031071618
> (+3031038850)
> Inode table at 3149300410-3149300921 (+3149267642)
> 1881 free blocks, 46059 free inodes, 25281 directories, 29973 unused
> inodes
> Group 2: (Blocks 65536-98303) [INODE_UNINIT, ITABLE_ZEROED]
> Checksum 0x1a0b, unused inodes 51590
> Block bitmap at 1509085182 (+1509019646), Inode bitmap at 2884607537
> (+2884542001)
> Inode table at 1940584034-1940584545 (+1940518498)
> 3770 free blocks, 40683 free inodes, 43709 directories, 51590 unused
> inodes
> Group 3: (Blocks 98304-131071) [ITABLE_ZEROED]
> Checksum 0xc3ec, unused inodes 47423
> Backup superblock at 98304, Group descriptors at 98305-98654
> Reserved GDT blocks at 98655-99328
> Block bitmap at 383505502 (+383407198), Inode bitmap at 1784600367
> (+1784502063)
> Inode table at 798930664-798931175 (+798832360)
> 63118 free blocks, 7143 free inodes, 19773 directories, 47423 unused
> inodes
>
>
>
> root@...ver:/var/log/fsck# dmesg |egrep -i "sd|md|raid|fsck"
> [ 0.000000] AMD AuthenticAMD
> [ 0.000000] RAMDISK: 37778000 - 37fef9b2
> [ 0.000000] ACPI: RSDP 000FE020, 0014 (r0 INTEL )
> [ 0.000000] ACPI: RSDT CFEFD038, 004C (r1 INTEL D975XBX2 AE8
> 1000013)
> [ 0.000000] ACPI: DSDT CFEF8000, 3F11 (r1 INTEL D975XBX2 AE8
> MSFT 1000013)
> [ 0.000000] ACPI: SSDT CFEF2000, 01BC (r1 INTEL CpuPm AE8
> MSFT 1000013)
> [ 0.000000] ACPI: SSDT CFEF1000, 0175 (r1 INTEL Cpu0Ist AE8
> MSFT 1000013)
> [ 0.000000] ACPI: SSDT CFEF0000, 0175 (r1 INTEL Cpu1Ist AE8
> MSFT 1000013)
> [ 0.000000] ACPI: SSDT CFEAB000, 0175 (r1 INTEL Cpu2Ist AE8
> MSFT 1000013)
> [ 0.000000] ACPI: SSDT CFEAA000, 0175 (r1 INTEL Cpu3Ist AE8
> MSFT 1000013)
> [ 0.000000] #3 [0037778000 - 0037fef9b2] RAMDISK ==>
> [0037778000 - 0037fef9b2]
> [ 0.000000] [ffffe20000000000-ffffe200043fffff] PMD ->
> [ffff880028200000-ffff88002c5fffff] on node 0
> [ 0.013732] ACPI: Checking initramfs for custom DSDT
> [ 0.920745] ACPI: EC: Look up EC in DSDT
> [ 1.835081] Fixed MDIO Bus: probed
> [ 1.835147] Driver 'sd' needs updating - please use bus_type methods
> [ 1.835891] ata1: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0x40b0
> irq 14
> [ 1.835893] ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0x40b8
> irq 15
> [ 2.056689] ata3: SATA max UDMA/133 cmd 0x40c8 ctl 0x40e4 bmdma
> 0x40a0 irq 19
> [ 2.056691] ata4: SATA max UDMA/133 cmd 0x40c0 ctl 0x40e0 bmdma
> 0x40a8 irq 19
> [ 2.250605] ata3.00: ATA-8: ST31000340AS, SD1A, max UDMA/133
> [ 2.510628] ata4.00: ATA-8: ST31000340AS, SD1A, max UDMA/133
> [ 2.591311] scsi 2:0:0:0: Direct-Access ATA ST31000340AS
> SD1A PQ: 0 ANSI: 5
> [ 2.591402] sd 2:0:0:0: [sda] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 2.591414] sd 2:0:0:0: [sda] Write Protect is off
> [ 2.591416] sd 2:0:0:0: [sda] Mode Sense: 00 3a 00 00
> [ 2.591435] sd 2:0:0:0: [sda] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 2.591478] sd 2:0:0:0: [sda] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 2.591489] sd 2:0:0:0: [sda] Write Protect is off
> [ 2.591490] sd 2:0:0:0: [sda] Mode Sense: 00 3a 00 00
> [ 2.591508] sd 2:0:0:0: [sda] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 2.591511] sda: unknown partition table
> [ 2.600717] sd 2:0:0:0: [sda] Attached SCSI disk
> [ 2.600745] sd 2:0:0:0: Attached scsi generic sg1 type 0
> [ 2.600855] sd 2:0:1:0: [sdb] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 2.600866] sd 2:0:1:0: [sdb] Write Protect is off
> [ 2.600868] sd 2:0:1:0: [sdb] Mode Sense: 00 3a 00 00
> [ 2.600886] sd 2:0:1:0: [sdb] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 2.600924] sd 2:0:1:0: [sdb] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 2.600934] sd 2:0:1:0: [sdb] Write Protect is off
> [ 2.600936] sd 2:0:1:0: [sdb] Mode Sense: 00 3a 00 00
> [ 2.600954] sd 2:0:1:0: [sdb] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 2.600957] sdb: unknown partition table
> [ 3.072070] sd 2:0:1:0: [sdb] Attached SCSI disk
> [ 3.072115] sd 2:0:1:0: Attached scsi generic sg2 type 0
> [ 3.072178] scsi 3:0:0:0: Direct-Access ATA ST31000340AS
> SD1A PQ: 0 ANSI: 5
> [ 3.072237] sd 3:0:0:0: [sdc] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 3.072248] sd 3:0:0:0: [sdc] Write Protect is off
> [ 3.072249] sd 3:0:0:0: [sdc] Mode Sense: 00 3a 00 00
> [ 3.072268] sd 3:0:0:0: [sdc] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 3.072303] sd 3:0:0:0: [sdc] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 3.072313] sd 3:0:0:0: [sdc] Write Protect is off
> [ 3.072315] sd 3:0:0:0: [sdc] Mode Sense: 00 3a 00 00
> [ 3.072333] sd 3:0:0:0: [sdc] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 3.072336] sdc: unknown partition table
> [ 3.079128] sd 3:0:0:0: [sdc] Attached SCSI disk
> [ 3.079156] sd 3:0:0:0: Attached scsi generic sg3 type 0
> [ 3.079257] sd 3:0:1:0: [sdd] 293046768 512-byte hardware sectors:
> (150 GB/139 GiB)
> [ 3.079268] sd 3:0:1:0: [sdd] Write Protect is off
> [ 3.079269] sd 3:0:1:0: [sdd] Mode Sense: 00 3a 00 00
> [ 3.079287] sd 3:0:1:0: [sdd] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 3.079322] sd 3:0:1:0: [sdd] 293046768 512-byte hardware sectors:
> (150 GB/139 GiB)
> [ 3.079332] sd 3:0:1:0: [sdd] Write Protect is off
> [ 3.079334] sd 3:0:1:0: [sdd] Mode Sense: 00 3a 00 00
> [ 3.079352] sd 3:0:1:0: [sdd] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 3.079354] sdd: sdd1 sdd2 < sdd5 >
> [ 3.101054] sd 3:0:1:0: [sdd] Attached SCSI disk
> [ 3.101107] sd 3:0:1:0: Attached scsi generic sg4 type 0
> [ 3.470676] ata5.00: ATA-8: ST31000340AS, SD1A, max UDMA/133
> [ 3.880672] ata6.00: ATA-8: ST31000340AS, SD1A, max UDMA/133
> [ 4.290698] ata7.00: ATA-8: ST31000340AS, SD1A, max UDMA/133
> [ 4.700696] ata8.00: ATA-8: ST31000340AS, SD1A, max UDMA/133
> [ 4.740750] scsi 4:0:0:0: Direct-Access ATA ST31000340AS
> SD1A PQ: 0 ANSI: 5
> [ 4.740831] sd 4:0:0:0: [sde] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 4.740842] sd 4:0:0:0: [sde] Write Protect is off
> [ 4.740844] sd 4:0:0:0: [sde] Mode Sense: 00 3a 00 00
> [ 4.740862] sd 4:0:0:0: [sde] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 4.740898] sd 4:0:0:0: [sde] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 4.740909] sd 4:0:0:0: [sde] Write Protect is off
> [ 4.740910] sd 4:0:0:0: [sde] Mode Sense: 00 3a 00 00
> [ 4.740928] sd 4:0:0:0: [sde] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 4.740930] sde: unknown partition table
> [ 4.749416] sd 4:0:0:0: [sde] Attached SCSI disk
> [ 4.749443] sd 4:0:0:0: Attached scsi generic sg5 type 0
> [ 4.749488] scsi 5:0:0:0: Direct-Access ATA ST31000340AS
> SD1A PQ: 0 ANSI: 5
> [ 4.749546] sd 5:0:0:0: [sdf] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 4.749557] sd 5:0:0:0: [sdf] Write Protect is off
> [ 4.749559] sd 5:0:0:0: [sdf] Mode Sense: 00 3a 00 00
> [ 4.749576] sd 5:0:0:0: [sdf] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 4.749613] sd 5:0:0:0: [sdf] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 4.749623] sd 5:0:0:0: [sdf] Write Protect is off
> [ 4.749624] sd 5:0:0:0: [sdf] Mode Sense: 00 3a 00 00
> [ 4.749642] sd 5:0:0:0: [sdf] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 4.749645] sdf: unknown partition table
> [ 4.759788] sd 5:0:0:0: [sdf] Attached SCSI disk
> [ 4.759815] sd 5:0:0:0: Attached scsi generic sg6 type 0
> [ 4.759859] scsi 6:0:0:0: Direct-Access ATA ST31000340AS
> SD1A PQ: 0 ANSI: 5
> [ 4.759919] sd 6:0:0:0: [sdg] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 4.759930] sd 6:0:0:0: [sdg] Write Protect is off
> [ 4.759932] sd 6:0:0:0: [sdg] Mode Sense: 00 3a 00 00
> [ 4.759950] sd 6:0:0:0: [sdg] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 4.759986] sd 6:0:0:0: [sdg] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 4.759997] sd 6:0:0:0: [sdg] Write Protect is off
> [ 4.759998] sd 6:0:0:0: [sdg] Mode Sense: 00 3a 00 00
> [ 4.760022] sd 6:0:0:0: [sdg] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 4.760027] sdg: unknown partition table
> [ 4.771408] sd 6:0:0:0: [sdg] Attached SCSI disk
> [ 4.771439] sd 6:0:0:0: Attached scsi generic sg7 type 0
> [ 4.771483] scsi 7:0:0:0: Direct-Access ATA ST31000340AS
> SD1A PQ: 0 ANSI: 5
> [ 4.771540] sd 7:0:0:0: [sdh] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 4.771551] sd 7:0:0:0: [sdh] Write Protect is off
> [ 4.771552] sd 7:0:0:0: [sdh] Mode Sense: 00 3a 00 00
> [ 4.771570] sd 7:0:0:0: [sdh] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 4.771608] sd 7:0:0:0: [sdh] 1953525168 512-byte hardware sectors:
> (1.00 TB/931 GiB)
> [ 4.771618] sd 7:0:0:0: [sdh] Write Protect is off
> [ 4.771620] sd 7:0:0:0: [sdh] Mode Sense: 00 3a 00 00
> [ 4.771637] sd 7:0:0:0: [sdh] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 4.771640] sdh: unknown partition table
> [ 4.781982] sd 7:0:0:0: [sdh] Attached SCSI disk
> [ 4.782012] sd 7:0:0:0: Attached scsi generic sg8 type 0
> [ 4.942482] block sdd5: hash matches
> [ 5.048354] md: linear personality registered for level -1
> [ 5.050051] md: multipath personality registered for level -4
> [ 5.051538] md: raid0 personality registered for level 0
> [ 5.053697] md: raid1 personality registered for level 1
> [ 5.271272] raid6: int64x1 1922 MB/s
> [ 5.441269] raid6: int64x2 2639 MB/s
> [ 5.611280] raid6: int64x4 2025 MB/s
> [ 5.781295] raid6: int64x8 1789 MB/s
> [ 5.951290] raid6: sse2x1 3078 MB/s
> [ 6.121297] raid6: sse2x2 3651 MB/s
> [ 6.291275] raid6: sse2x4 7193 MB/s
> [ 6.291281] raid6: using algorithm sse2x4 (7193 MB/s)
> [ 6.291283] md: raid6 personality registered for level 6
> [ 6.291285] md: raid5 personality registered for level 5
> [ 6.291286] md: raid4 personality registered for level 4
> [ 6.296306] md: raid10 personality registered for level 10
> [ 6.494887] md: bind<sde>
> [ 6.555824] md: bind<sdf>
> [ 6.622315] md: bind<sdh>
> [ 6.703948] md: bind<sda>
> [ 6.780815] md: bind<sdg>
> [ 7.023507] md: bind<sdc>
> [ 7.223400] md: bind<sdb>
> [ 7.226582] raid5: device sdb operational as raid disk 1
> [ 7.226584] raid5: device sdc operational as raid disk 2
> [ 7.226586] raid5: device sdg operational as raid disk 5
> [ 7.226587] raid5: device sda operational as raid disk 0
> [ 7.226588] raid5: device sdh operational as raid disk 6
> [ 7.226589] raid5: device sdf operational as raid disk 4
> [ 7.226591] raid5: device sde operational as raid disk 3
> [ 7.227201] raid5: allocated 7450kB for md0
> [ 7.227203] raid5: raid level 5 set md0 active with 7 out of 7
> devices, algorithm 2
> [ 7.227205] RAID5 conf printout:
> [ 7.227207] disk 0, o:1, dev:sda
> [ 7.227208] disk 1, o:1, dev:sdb
> [ 7.227209] disk 2, o:1, dev:sdc
> [ 7.227210] disk 3, o:1, dev:sde
> [ 7.227212] disk 4, o:1, dev:sdf
> [ 7.227213] disk 5, o:1, dev:sdg
> [ 7.227214] disk 6, o:1, dev:sdh
> [ 7.228333] md0: unknown partition table
> [ 12.709829] Adding 5992204k swap on /dev/sdd5. Priority:-1 extents:1
> across:5992204k
> [ 13.245731] EXT3 FS on sdd1, internal journal
> [ 317.618298] type=1505 audit(1241888758.168:7):
> operation="profile_load" name="/usr/sbin/cupsd" name2="default" pid=2550
> [ 318.016442] Installing knfsd (copyright (C) 1996 okir@...ad.swb.de).
> [ 322.767731] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state
> recovery directory
> [ 322.774119] NFSD: starting 90-second grace period
>
> --
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Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
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