Dear Qu, Am 16.01.20 um 01:56 schrieb Qu Wenruo: > > > On 2020/1/16 上午6:04, Oliver Freyermuth wrote: >> Dear BTRFSers, >> >> I have recently upgraded to 5.4.11 from a 5.3 kernel and now also hit the dreaded read time tree block corruption on one of my nodes :-(. >> Memory tests show no issues (after few hours, I'll do longer tests later), and I had performed the last full scrub only two weeks ago (on Kernel 5.3) and no errors were found. >> Backups (1 week old) are available, but I'd prefer to recover the filesystem unless you tell me it's a terminal illness. >> >> Here's the excerpt from the kernel log: >> ---------- >> [ 65.995061] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845] >> [ 65.995064] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected >> [ 66.986510] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845] >> [ 66.986515] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected >> [ 66.986902] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845] >> [ 66.986906] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected >> [ 66.987226] BTRFS info (device sdb1): scrub: not finished on devid 1 with status: -5 >> [ 70.656012] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845] >> [ 70.656015] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected >> [ 70.656271] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845] >> [ 70.656273] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected >> [ 70.656286] BTRFS: error (device sdb1) in btrfs_run_delayed_refs:2188: errno=-5 IO failure >> [ 70.656289] BTRFS info (device sdb1): forced readonly >> [ 70.656293] BTRFS warning (device sdb1): Skipping commit of aborted transaction. >> [ 70.656295] BTRFS: error (device sdb1) in cleanup_transaction:1828: errno=-5 IO failure >> ---------- >> >> I subsequently rebooted into an initrd with the recent BTRFS progs 5.4.1, and ran "btrfs check" (without --repair). >> I got (typed that by hand, so I hope I got everything right...): >> ---------- >> Opening file system to check... >> Checking file system on /dev/sdb1 >> UUID: XXXXXXXX >> [1/7] checking root items (0:00:05 elapsed, 3367568 items checked) >> ERROR: invalid generation for extent 676227178496, have 18349846316030361600 expect (0, 368854) >> [2/7] checking extents (00:00:53 elapsed, 339133 items checked) >> ERROR: errors found in extent allocation tree or chunk allocation >> ---------- >> No other errors were reported (i.e. steps 3 to 7 ran fine), so that looks pretty consistent. >> >> I presume this means the invalid generation in the single extent is the only visible issue. >> As far as I understand, "btrfs check --repair" should be able to fix that starting from version 5.4. >> >> Can you confirm it should be safe to run "btrfs check --repair" on that volume? > > Unfortunately, no. > > Currently the only way to fix it is by --init-extent-tree, which can be > super super super slow. > > Although --repair just won't do anything harmful. > Considering how slow --init-extent-tree is, I need to add proper fix > --repair, but that needs some time. Thanks! There would be no high urgency for that machine, but I'll sleep better after fixing it, so I went with your second suggestion. > >> >> I've attached the output of dump-tree of the affected block at the end of the mail in case it's interesting. >> Any other information which might be interesting to the developers? > > Since it's a data extent, the safest way would be go back to v5.3, find > the inode owning this data extent, and just delete it. > > To find out the inodes owning it, you can use the following command: > # btrfs ins logical-resolve 676227178496 /mnt/btrfs Indeed, that helped :-). Many thanks! Curiously, the affected directory was from 2014, which (I think) predates the last time I recreated the file system (old data copied over), and should have been untouched since then. On a separate backup disk to which I btrfs-send snapshots from that machine, the directory seems unaffected by the corruption. Memory tests still don't reveal anything, so it's unclear what happened. I _think_ I had a situation of high memory pressure => OOM => hang on the machine a few weeks ago, which would make it match an earlier problem with unexpected read tree block corruption somebody reported on this list, but that might be a red herring. Cheers and many thanks! Oliver > > Thanks, > Qu > >> >> Cheers and thanks, >> Oliver >> >> >> ---------------------- >> >> btrfs insp dump-t -b 1209570770944 /dev/sdb1 >> btrfs-progs v5.4.1 >> leaf 1209570770944 items 189 free space 4168 generation 368774 owner EXTENT_TREE >> leaf 1209570770944 flags 0x1(WRITTEN) backref revision 1 >> fs uuid 77ed8441-2919-4e70-802f-2df93dad2735 >> chunk uuid f8e2f634-065f-4ee9-b54a-6d6115e317e0 >> item 0 key (676226424832 EXTENT_ITEM 8192) itemoff 16246 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 1208927469568 count 1 >> item 1 key (676226433024 EXTENT_ITEM 4096) itemoff 16209 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 984507351040 count 1 >> item 2 key (676226437120 EXTENT_ITEM 4096) itemoff 16172 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 985354911744 count 1 >> item 3 key (676226441216 EXTENT_ITEM 4096) itemoff 16106 itemsize 66 >> refs 2 gen 160495 flags DATA >> extent data backref root 437 objectid 12776677 offset 4005888 count 1 >> shared data backref parent 824712167424 count 1 >> item 4 key (676226445312 EXTENT_ITEM 4096) itemoff 16069 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 984503992320 count 1 >> item 5 key (676226449408 EXTENT_ITEM 4096) itemoff 16032 itemsize 37 >> refs 1 gen 367294 flags DATA >> shared data backref parent 1225932455936 count 1 >> item 6 key (676226453504 EXTENT_ITEM 4096) itemoff 15995 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 985354944512 count 1 >> item 7 key (676226457600 EXTENT_ITEM 8192) itemoff 15958 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 820846215168 count 1 >> item 8 key (676226465792 EXTENT_ITEM 4096) itemoff 15921 itemsize 37 >> refs 1 gen 367294 flags DATA >> shared data backref parent 1225930653696 count 1 >> item 9 key (676226469888 EXTENT_ITEM 4096) itemoff 15884 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 822734503936 count 1 >> item 10 key (676226473984 EXTENT_ITEM 4096) itemoff 15847 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 984792776704 count 1 >> item 11 key (676226478080 EXTENT_ITEM 8192) itemoff 15810 itemsize 37 >> refs 1 gen 367294 flags DATA >> shared data backref parent 1225927852032 count 1 >> item 12 key (676226486272 EXTENT_ITEM 4096) itemoff 15773 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 1209924648960 count 1 >> item 13 key (676226490368 EXTENT_ITEM 4096) itemoff 15736 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 823355768832 count 1 >> item 14 key (676226494464 EXTENT_ITEM 4096) itemoff 15673 itemsize 63 >> refs 3 gen 160495 flags DATA >> shared data backref parent 820494434304 count 1 >> shared data backref parent 820476985344 count 1 >> shared data backref parent 820462600192 count 1 >> item 15 key (676226498560 EXTENT_ITEM 4096) itemoff 15636 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 822734503936 count 1 >> item 16 key (676226502656 EXTENT_ITEM 4096) itemoff 15599 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 821816311808 count 1 >> item 17 key (676226506752 EXTENT_ITEM 4096) itemoff 15562 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 985354944512 count 1 >> item 18 key (676226510848 EXTENT_ITEM 4096) itemoff 15525 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 821624553472 count 1 >> item 19 key (676226514944 EXTENT_ITEM 4096) itemoff 15488 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 820741554176 count 1 >> item 20 key (676226519040 EXTENT_ITEM 12288) itemoff 15451 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 1208928337920 count 1 >> item 21 key (676226531328 EXTENT_ITEM 4096) itemoff 15414 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 820554399744 count 1 >> item 22 key (676226535424 EXTENT_ITEM 4096) itemoff 15351 itemsize 63 >> refs 3 gen 160495 flags DATA >> shared data backref parent 820494434304 count 1 >> shared data backref parent 820476985344 count 1 >> shared data backref parent 820462600192 count 1 >> item 23 key (676226539520 EXTENT_ITEM 4096) itemoff 15314 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 820554399744 count 1 >> item 24 key (676226543616 EXTENT_ITEM 4096) itemoff 15277 itemsize 37 >> refs 1 gen 277894 flags DATA >> shared data backref parent 821861941248 count 1 >> item 25 key (676226547712 EXTENT_ITEM 4096) itemoff 15240 itemsize 37 >> refs 1 gen 160495 flags DATA >> shared data backref parent 820741554176 count 1 >> item 26 key (676226551808 EXTENT_ITEM 4096) itemoff 15187 itemsize 53 >> refs 1 gen 160495 flags DATA >> extent data backref root 437 objectid 9638886 offset 0 count 1 >> item 27 key (676226555904 EXTENT_ITEM 8192) itemoff 15134 itemsize 53 >> refs 1 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