On 2018年06月09日 20:22, Simon Kaiser wrote: > Hi all, > > I'm having trouble with my btrfs volume on a Samsung SSD 840 pro. On > startup I immediately get the error > > BTRFS critical (device sda5): corrupt leaf: root=1 block=73263579136 > slot=105, unaligned key offset for csum item, have 1271496708 should be > aligned to 4096
Tree-checker detects something. And indeed the bytenr is not even aligned to 512. So definitely a corruption. > > I used to make regular backups, but slacked off recently. Fixing the > filesystem isn't essential in any way, but would save me quite some time > on config tinkering and weeding out vacation photos. The second of > which I don't enjoy at all... > > On similar issues faulty RAM seemed to be the most prominent cause. I > added a third memory module quite recently which could have caused this, > but I couldn't run memtest long enough yet to verify. Indeed, the corrupted bytenr is 0x4bc98004. Looks pretty like a bit flip in the 3rd lowest bit. It can be fixed by manually patching the corrupted leaf to get rid of the bitflip. I could provide a special branch of btrfs-progs to fix it easily. But before that, it's better to do a scrub to see if there is other similar problems, so I could fix them all. Thanks, Qu > > Here's the trimmed dmesg output (full output at > https://pastebin.com/7XF9i09K) > > [ 4.062748] BTRFS critical (device sda5): corrupt leaf: root=1 > block=73263579136 slot=105, unaligned key offset for csum item, have > 1271496708 should be aligned to 4096 > [ 4.063806] BTRFS info (device sda5): no csum found for inode 7810710 > start 0 > [ 4.064260] BTRFS warning (device sda5): csum failed root 257 ino 7810710 > off 109201939968 csum 0x5307fa6f expected csum 0x00000000 mirror 1 > [ 4.075834] BTRFS info (device sdb3): use lzo compression, level 0 > [ 4.075836] BTRFS info (device sdb3): enabling auto defrag > [ 4.075837] BTRFS info (device sdb3): disk space caching is enabled > > `brfs inspect-internal dump-tree -b 73263579136 /dev/sda5` (trimmed, > full output at https://pastebin.com/dqBJ3b6D) > > btrfs-progs v4.16.1 > leaf 73263579136 items 194 free space 4089 generation 530006 owner CSUM_TREE > leaf 73263579136 flags 0x1(WRITTEN) backref revision 1 > fs uuid 95b4974b-a798-44b3-99aa-a4eef990aeeb > chunk uuid 9c8f46c3-ba51-4175-857c-8041543fa813 > item 0 key (EXTENT_CSUM EXTENT_CSUM 1268850688) itemoff 16263 itemsize > 20 > range start 1268850688 end 1268871168 length 20480 > item 1 key (EXTENT_CSUM EXTENT_CSUM 1268871168) itemoff 16259 itemsize 4 > range start 1268871168 end 1268875264 length 4096 > item 2 key (EXTENT_CSUM EXTENT_CSUM 1268875264) itemoff 16255 itemsize 4 > range start 1268875264 end 1268879360 length 4096 > item 3 key (EXTENT_CSUM EXTENT_CSUM 1268879360) itemoff 16239 itemsize > 16 > range start 1268879360 end 1268895744 length 16384 > item 4 key (EXTENT_CSUM EXTENT_CSUM 1268895744) itemoff 16235 itemsize 4 > range start 1268895744 end 1268899840 length 4096 > item 5 key (EXTENT_CSUM EXTENT_CSUM 1268899840) itemoff 16223 itemsize > 12 > range start 1268899840 end 1268912128 length 12288 > [...] > item 100 key (EXTENT_CSUM EXTENT_CSUM 1271410688) itemoff 13827 > itemsize 8 > range start 1271410688 end 1271418880 length 8192 > item 101 key (EXTENT_CSUM EXTENT_CSUM 1271418880) itemoff 13811 > itemsize 16 > range start 1271418880 end 1271435264 length 16384 > item 102 key (EXTENT_CSUM EXTENT_CSUM 1271435264) itemoff 13807 > itemsize 4 > range start 1271435264 end 1271439360 length 4096 > item 103 key (EXTENT_CSUM EXTENT_CSUM 1271439360) itemoff 13771 > itemsize 36 > range start 1271439360 end 1271476224 length 36864 > item 104 key (EXTENT_CSUM EXTENT_CSUM 1271488512) itemoff 13763 > itemsize 8 > range start 1271488512 end 1271496704 length 8192 > item 105 key (EXTENT_CSUM EXTENT_CSUM 1271496708) itemoff 13403 > itemsize 360 > range start 1271496708 end 1271865348 length 368640 > item 106 key (EXTENT_CSUM EXTENT_CSUM 1271873536) itemoff 13399 > itemsize 4 > range start 1271873536 end 1271877632 length 4096 > item 107 key (EXTENT_CSUM EXTENT_CSUM 1271877632) itemoff 13379 > itemsize 20 > range start 1271877632 end 1271898112 length 20480 > item 108 key (EXTENT_CSUM EXTENT_CSUM 1271898112) itemoff 13375 > itemsize 4 > range start 1271898112 end 1271902208 length 4096 > item 109 key (EXTENT_CSUM EXTENT_CSUM 1271918592) itemoff 13363 > itemsize 12 > range start 1271918592 end 1271930880 length 12288 > item 110 key (EXTENT_CSUM EXTENT_CSUM 1271930880) itemoff 13351 > itemsize 12 > range start 1271930880 end 1271943168 length 12288 > [...] > > `uname -a` > > Linux hostname 4.16.12-1-ARCH #1 SMP PREEMPT Fri May 25 23:30:31 UTC 2018 > x86_64 GNU/Linux > > `btrfs fi show` > > Label: 'arch' uuid: 95b4974b-a798-44b3-99aa-a4eef990aeeb > Total devices 1 FS bytes used 78.10GiB > devid 1 size 100.00GiB used 94.05GiB path /dev/sda5 > > `btrfs fi df` > > Data, single: total=90.01GiB, used=76.32GiB > System, single: total=32.00MiB, used=16.00KiB > Metadata, single: total=4.01GiB, used=1.78GiB > GlobalReserve, single: total=512.00MiB, used=0.00B > > Is there any chance this can be fixed? Your help would be greatly > apperciated! > > Yours, > Simon > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html >
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