On 2020/1/6 上午1:14, Vladimir wrote: > I've updated to the d39ab9f commit of devel branch and restarted > --init-extent-tree. > It looks like it currently keeps restoring extent backrefs: > > Repaired extent references for 11186647040 > ref mismatch on [11186655232 8192] extent item 0, found 3 > data backref 11186655232 parent 1652575469568 owner 0 offset 0 > num_refs 0 not found in extent tree > incorrect local backref count on 11186655232 parent 1652575469568 > owner 0 offset 0 found 1 wanted 0 back 0xf6d491c0 > data backref 11186655232 root 2368 owner 5682 offset 37952913408 > num_refs 0 not found in extent tree > incorrect local backref count on 11186655232 root 2368 owner 5682 > offset 37952913408 found 1 wanted 0 back 0x2c4b4770 > data backref 11186655232 parent 1581906853888 owner 0 offset 0 > num_refs 0 not found in extent tree > incorrect local backref count on 11186655232 parent 1581906853888 > owner 0 offset 0 found 1 wanted 0 back 0x10377eb20 > backpointer mismatch on [11186655232 8192] > adding new data backref on 11186655232 parent 1652575469568 owner 0 > offset 0 found 1 > adding new data backref on 11186655232 root 2368 owner 5682 offset > 37952913408 found 1 > adding new data backref on 11186655232 parent 1581906853888 owner 0 > offset 0 found 1 > > How can I detect the latest backref ID? I would like to determine ETA > for the whole process as it tends to slow down as the time goes - > initially it was blazing fast but slows down with backref ID growing > and it only uses the single CPU core. That "Backref ID" is in fact tree block/data bytenr. It's not hat easy to determine an completely accurate one, but you can refer to your chunk tree to get a mapping, and all bytenr shouldn't go beyond that range. > > And one more question: I've attempted to use btrfs restore to get the > most important files from this FS but failed: > offset is 8192 > offset is 364544 > offset is 45056 > offset is 98304 > offset is 94208 > offset is 61440 > We seem to be looping a lot on > /mnt/111/libvirt/images/iphone-apps-w10.hb.img, do you want to keep > going on ? (y/N/a): offset is 4096 > offset is 8192 > offset is 61440 > offset is 24576 > offset is 12288 > offset is 36864 > offset is 20480 > offset is 118784 > offset is 557056 > offset is 20480 > offset is 65536 > offset is 69632 > offset is 94208 > offset is 16384 > offset is 4096 > offset is 139264 > offset is 430080 > ERROR: cannot map block logical 99312730112 length 1107296256: -2 > Error copying data for /mnt/111/libvirt/images/iphone-apps-w10.hb.img That bytenr is doesn't look good, it's too large for a single extent. Not sure how this happened, need extra debug after --init-extent-tree finished. > > I know this file of VM important to me has CRC mismatches detected > during scrub while FS was alive but don't know why as I'm always > getting CRC mismatches for the most IO-active VMs - could it be > related to btrfs restore error? IIRC under certain load, btrfs tends to cause false CRC error. It's recommended to disable data cow for VM images. > And if it is related to the CRC > mismatches, is there any other way to get files with CRC mismatches > from this damaged FS? > I thought about attempting to use 5.3 because you mentioned that my > issue is related to the new extent generation tree-checker introduced > in v5.4 but afraid to interrupt btrfs check process to verify if > downgrade will help me to get files from this FS faster then btrfs > check. It's recommended to let that --init-extent-tree to finish. Thanks, Qu > > Thanks for your help! > > вс, 5 янв. 2020 г. в 05:59, Qu Wenruo <quwenruo.btrfs@xxxxxxx>: >> >> >> >> On 2020/1/5 上午9:30, Vladimir wrote: >>> Dear BTRFS community, >>> >>> I hit a strange issue: btrfsck unable to detect any errors, but I'm >>> also unable to mount this "sane" (by the btrfsck opinion) BTRFS >>> partition. >>> >>> Long story short: at some point, I had to forcefully power off my >>> laptop due to near-OOM hang with very intensive swapping caused by >>> starting the memory-hungry app. >>> This happened on 5.4.0-1.el7.elrepo.x86_64 kernel. >>> >>> After reboot I was unable to mount my data partition (/dev/stripe/data): >>> [29798.631579] BTRFS info (device dm-11): disk space caching is enabled >>> [29798.631581] BTRFS info (device dm-11): has skinny extents >>> [29798.637910] BTRFS info (device dm-11): bdev >>> /dev/mapper/stripe-data--snap2 errs: wr 0, rd 11, flush 0, corrupt >>> 3452, gen 0 >>> [29798.677872] BTRFS critical (device dm-11): corrupt leaf: >>> block=1651991592960 slot=16 extent bytenr=93983342592 len=524288 >>> invalid generation, have 140287904167864 expect (0, 6389777] >> >> This is the new extent geneartion tree-checker introduced in v5.4. >> >> btrfs-progs doesn't yet support it, but the detect part is already >> submitted to btrfs mail list. >> >> The fs can be completely saved without losing anything. >> You can fetch the this branch: >> https://github.com/kdave/btrfs-progs/tree/devel >> >> Then use --init-extent-tree to fix the problem. >> >> Thanks, >> Qu >> >>> [29798.677875] BTRFS error (device dm-11): block=1651991592960 read >>> time tree block corruption detected >>> [29798.677895] BTRFS error (device dm-11): failed to read block groups: -5 >>> [29798.691723] BTRFS error (device dm-11): open_ctree failed >>> >>> I've created an LVM snapshot of the damaged partition and started to dig in: >>> >>> At first, I've updated my kernel to the latest one: >>> # cat /proc/version >>> Linux version 5.4.7-1.el7.elrepo.x86_64 (mockbuild@Build64R7) (gcc >>> version 4.8.5 20150623 (Red Hat 4.8.5-39) (GCC)) #1 SMP Tue Dec 31 >>> 11:30:50 EST 2019 >>> >>> Second, I've updated btrfs-progs to the latest available version: >>> # btrfs version >>> btrfs-progs v5.4 >>> >>> Third, I've attempted to mount this partition again (with no success, >>> even if I'm attempting to use subvolid for the most important >>> subvolume) and then attempted to run btrfsck --repair: >>> # btrfs check -p --repair /dev/stripe/data-snap3 >>> enabling repair mode >>> WARNING: >>> >>> Do not use --repair unless you are advised to do so by a developer >>> or an experienced user, and then only after having accepted that no >>> fsck can successfully repair all types of filesystem corruption. Eg. >>> some software or hardware bugs can fatally damage a volume. >>> The operation will start in 10 seconds. >>> Use Ctrl-C to stop it. >>> 10 9 8 7 6 5 4 3 2 1 >>> Starting repair. >>> Opening filesystem to check... >>> Checking filesystem on /dev/stripe/data-snap3 >>> UUID: 51d26840-8d19-4622-a23f-e78431f11196 >>> [1/7] checking root items (0:00:04 elapsed, >>> 3025927 items checked) >>> Fixed 0 roots. >>> No device size related problem found (0:00:36 elapsed, >>> 226080 items checked) >>> [2/7] checking extents (0:00:36 elapsed, >>> 226094 items checked) >>> cache and super generation don't match, space cache will be invalidated >>> [3/7] checking free space cache (0:00:00 elapsed) >>> [4/7] checking fs roots (0:00:55 elapsed, >>> 179338 items checked) >>> [5/7] checking csums (without verifying data) (0:00:01 elapsed, >>> 929754 items checked) >>> [6/7] checking root refs (0:00:00 elapsed, 151 >>> items checked) >>> [7/7] checking quota groups skipped (not enabled on this FS) >>> found 329136820224 bytes used, no error found >>> total csum bytes: 317705000 >>> total tree bytes: 3702947840 >>> total fs tree bytes: 2947874816 >>> total extent tree bytes: 342605824 >>> btree space waste bytes: 640513083 >>> file data blocks allocated: 997170450432 >>> referenced 528523653120 >>> >>> Currently, I'm waiting for `btrfsck --init-extent-tree` and `btrfs >>> restore` to finish runs on snapshots but not sure if btrfsck is going >>> to help. >>> >>> Some additional info: >>> >>> # btrfs insp dump-tree -b 1651557531648 --follow /dev/stripe/data-snap3 >>> btrfs-progs v5.4 >>> leaf 1651557531648 items 206 free space 3402 generation 6389777 owner >>> EXTENT_TREE >>> leaf 1651557531648 flags 0x1(WRITTEN) backref revision 1 >>> fs uuid 51d26840-8d19-4622-a23f-e78431f11196 >>> chunk uuid 0de2db9c-a970-40f0-9fdb-c797b13ac0c1 >>> item 0 key (93981401088 EXTENT_ITEM 126976) itemoff 16204 itemsize 79 >>> refs 3 gen 3227277 flags DATA >>> extent data backref root 2368 objectid 5682 offset 23367835648 count 1 >>> shared data backref parent 1635492167680 count 1 >>> shared data backref parent 1601869201408 count 1 >>> item 1 key (93981528064 EXTENT_ITEM 12288) itemoff 16167 itemsize 37 >>> refs 1 gen 3691918 flags DATA >>> shared data backref parent 1080080089088 count 1 >>> item 2 key (93981544448 EXTENT_ITEM 49152) itemoff 16130 itemsize 37 >>> refs 1 gen 3684280 flags DATA >>> shared data backref parent 1079417503744 count 1 >>> item 3 key (93981593600 EXTENT_ITEM 4096) itemoff 16077 itemsize 53 >>> refs 1 gen 5689421 flags DATA >>> extent data backref root 2368 objectid 12305 offset 15963054080 count 1 >>> item 4 key (93981597696 EXTENT_ITEM 65536) itemoff 16024 itemsize 53 >>> refs 1 gen 6349517 flags DATA >>> extent data backref root 2368 objectid 261 offset 12687536128 count 1 >>> item 5 key (93981663232 EXTENT_ITEM 32768) itemoff 15987 itemsize 37 >>> refs 1 gen 6349520 flags DATA >>> shared data backref parent 1609922379776 count 1 >>> item 6 key (93981696000 EXTENT_ITEM 20480) itemoff 15950 itemsize 37 >>> refs 1 gen 6375808 flags DATA >>> shared data backref parent 1079170285568 count 1 >>> item 7 key (93981716480 EXTENT_ITEM 24576) itemoff 15913 itemsize 37 >>> refs 1 gen 6375808 flags DATA >>> shared data backref parent 1079170285568 count 1 >>> item 8 key (93981749248 EXTENT_ITEM 4096) itemoff 15860 itemsize 53 >>> refs 1 gen 5224843 flags DATA >>> extent data backref root 2368 objectid 262 offset 9913962496 count 1 >>> item 9 key (93981753344 EXTENT_ITEM 4096) itemoff 15807 itemsize 53 >>> refs 1 gen 5226775 flags DATA >>> extent data backref root 2368 objectid 261 offset 5763231744 count 1 >>> item 10 key (93981757440 EXTENT_ITEM 4096) itemoff 15754 itemsize 53 >>> refs 1 gen 5689421 flags DATA >>> extent data backref root 2368 objectid 12305 offset 15963062272 count 1 >>> item 11 key (93981761536 EXTENT_ITEM 8192) itemoff 15717 itemsize 37 >>> refs 1 gen 3692528 flags DATA >>> shared data backref parent 1081437290496 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1079186604032 count 1 >>> item 196 key (94074908672 EXTENT_ITEM 524288) itemoff 8885 itemsize 37 >>> refs 1 gen 0 flags DATA >>> shared data backref parent 1079186604032 count 1 >>> item 197 key (94075432960 EXTENT_ITEM 524288) itemoff 8848 itemsize 37 >>> refs 1 gen 140287904167864 flags DATA >>> shared data backref parent 1079186604032 count 1 >>> item 198 key (94075957248 EXTENT_ITEM 524288) itemoff 8811 itemsize 37 >>> refs 1 gen 13722329 flags DATA >>> shared data backref parent 1079186604032 count 1 >>> item 199 key (94076481536 EXTENT_ITEM 524288) itemoff 8774 itemsize 37 >>> refs 1 gen 18446744073709551606 flags DATA >>> shared data backref parent 1079186604032 count 1 >>> item 200 key (94077005824 EXTENT_ITEM 524288) itemoff 8737 itemsize 37 >>> refs 1 gen 1 flags DATA >>> shared data backref parent 1079186604032 count 1 >>> item 201 key (94077530112 EXTENT_ITEM 524288) itemoff 8700 itemsize 37 >>> refs 1 gen 48 flags DATA >>> shared data backref parent 1079186620416 count 1 >>> item 202 key (94078054400 EXTENT_ITEM 524288) itemoff 8663 itemsize 37 >>> refs 1 gen 6433 flags DATA >>> shared data backref parent 1079186620416 count 1 >>> item 203 key (94078578688 EXTENT_ITEM 524288) itemoff 8626 itemsize 37 >>> refs 1 gen 13535032 flags DATA >>> shared data backref parent 1079186620416 count 1 >>> item 204 key (94079102976 EXTENT_ITEM 524288) itemoff 8589 itemsize 37 >>> refs 1 gen 75207835648 flags DATA >>> shared data backref parent 1079186620416 count 1 >>> item 205 key (94079627264 EXTENT_ITEM 364544) itemoff 8552 itemsize 37 >>> refs 1 gen 16384 flags DATA >>> shared data backref parent 1079186620416 count 1 >>> >>> I'm kindly asking for help to fix this FS. >>> I also would like to know the way to prevent and fix such kind of >>> issues (except to never forcefully power off OS during IO-intensive >>> operations). >>> >>> Thanks everyone! >>> >> > >
Attachment:
signature.asc
Description: OpenPGP digital signature
