Hi again Chris, and many thanks again, Le 10/03/2020 à 04:46, Chris Murphy a écrit : > > Yep, this suggests a crash or power fail during fsync. This wouldn't susrprise me much, the laptop belonging to a kid who I know for sure doesn't pay much attention to battery level and experiments running out of battery quite often... > Maybe the first 50 lines of the btrfs check are useful to get an idea > what's going on, but without it, it's hard to say what's wrong or what > to do. Here it comes...: [root@zafu ~]# btrfs check /dev/sdb1 |& head -64 parent transid verify failed on 8176123904 wanted 183574 found 183573 parent transid verify failed on 8176123904 wanted 183574 found 183573 Ignoring transid failure [1/7] checking root items [2/7] checking extents ref mismatch on [5685248 16384] extent item 1, found 0 backref 5685248 root 258 not referenced back 0x564b1f957480 incorrect global backref count on 5685248 found 1 wanted 0 backpointer mismatch on [5685248 16384] owner ref check failed [5685248 16384] ref mismatch on [10420224 16384] extent item 1, found 0 backref 10420224 root 258 not referenced back 0x564b248ea1c0 incorrect global backref count on 10420224 found 1 wanted 0 backpointer mismatch on [10420224 16384] owner ref check failed [10420224 16384] ref mismatch on [10436608 16384] extent item 1, found 0 backref 10436608 root 258 not referenced back 0x564b248ea2c0 incorrect global backref count on 10436608 found 1 wanted 0 backpointer mismatch on [10436608 16384] owner ref check failed [10436608 16384] ref mismatch on [10534912 16384] extent item 1, found 0 backref 10534912 root 7 not referenced back 0x564b248ea3c0 incorrect global backref count on 10534912 found 1 wanted 0 backpointer mismatch on [10534912 16384] owner ref check failed [10534912 16384] ref mismatch on [11567104 16384] extent item 1, found 0 backref 11567104 root 7 not referenced back 0x564b1f9bce50 incorrect global backref count on 11567104 found 1 wanted 0 backpointer mismatch on [11567104 16384] owner ref check failed [11567104 16384] ref mismatch on [11862016 16384] extent item 1, found 0 backref 11862016 root 7 not referenced back 0x564b1f9bcfd0 incorrect global backref count on 11862016 found 1 wanted 0 backpointer mismatch on [11862016 16384] owner ref check failed [11862016 16384] ref mismatch on [13639680 4096] extent item 1, found 0 incorrect local backref count on 13639680 root 258 owner 949178 offset 0 found 0 wanted 1 back 0x564b248eb0c0 backref disk bytenr does not match extent record, bytenr=13639680, ref bytenr=0 backpointer mismatch on [13639680 4096] owner ref check failed [13639680 4096] ref mismatch on [13758464 4096] extent item 1, found 0 incorrect local backref count on 13758464 root 258 owner 769574 offset 0 found 0 wanted 1 back 0x564b248ec030 backref disk bytenr does not match extent record, bytenr=13758464, ref bytenr=0 backpointer mismatch on [13758464 4096] owner ref check failed [13758464 4096] ref mismatch on [13963264 4096] extent item 1, found 0 incorrect local backref count on 13963264 root 258 owner 1041188 offset 0 found 0 wanted 1 back 0x564b248eda50 backref disk bytenr does not match extent record, bytenr=13963264, ref bytenr=0 backpointer mismatch on [13963264 4096] owner ref check failed [13963264 4096] ref mismatch on [13971456 8192] extent item 1, found 0 incorrect local backref count on 13971456 root 258 owner 306160 offset 0 found 0 wanted 1 back 0x564b248edcb0 backref disk bytenr does not match extent record, bytenr=13971456, ref bytenr=0 backpointer mismatch on [13971456 8192] owner ref check failed [13971456 8192] ref mismatch on [13979648 4096] extent item 1, found 0 incorrect local backref count on 13979648 root 258 owner 306185 offset 0 found 0 wanted 1 back 0x564b248edde0 backref disk bytenr does not match extent record, bytenr=13979648, ref bytenr=0 backpointer mismatch on [13979648 4096] owner ref check failed [13979648 4096] ref mismatch on [13996032 4096] extent item 1, found 0 incorrect local backref count on 13996032 root 258 owner 739868 offset 0 found 0 wanted 1 back 0x564b248ee2a0 backref disk bytenr does not match extent record, bytenr=13996032, ref bytenr=0 backpointer mismatch on [13996032 4096] [root@zafu ~]# btrfs check -b /dev/sdb1 |& head -64 [1/7] checking root items [2/7] checking extents ref mismatch on [3819245568 4096] extent item 1, found 0 incorrect local backref count on 3819245568 root 257 owner 736217 offset 0 found 0 wanted 1 back 0x55f5e4931c00 backref disk bytenr does not match extent record, bytenr=3819245568, ref bytenr=0 backpointer mismatch on [3819245568 4096] owner ref check failed [3819245568 4096] ref mismatch on [3819421696 4096] extent item 1, found 0 incorrect local backref count on 3819421696 root 257 owner 736218 offset 0 found 0 wanted 1 back 0x55f5e49327e0 backref disk bytenr does not match extent record, bytenr=3819421696, ref bytenr=0 backpointer mismatch on [3819421696 4096] owner ref check failed [3819421696 4096] ref mismatch on [3821916160 4096] extent item 1, found 0 incorrect local backref count on 3821916160 root 257 owner 736219 offset 0 found 0 wanted 1 back 0x55f5e1ee28e0 backref disk bytenr does not match extent record, bytenr=3821916160, ref bytenr=0 backpointer mismatch on [3821916160 4096] owner ref check failed [3821916160 4096] ref mismatch on [3822043136 4096] extent item 1, found 0 incorrect local backref count on 3822043136 root 257 owner 736220 offset 0 found 0 wanted 1 back 0x55f5e1ee3130 backref disk bytenr does not match extent record, bytenr=3822043136, ref bytenr=0 backpointer mismatch on [3822043136 4096] owner ref check failed [3822043136 4096] ref mismatch on [3822174208 4096] extent item 1, found 0 incorrect local backref count on 3822174208 root 257 owner 736222 offset 0 found 0 wanted 1 back 0x55f5e1ee3f70 backref disk bytenr does not match extent record, bytenr=3822174208, ref bytenr=0 backpointer mismatch on [3822174208 4096] owner ref check failed [3822174208 4096] ref mismatch on [3822448640 4096] extent item 1, found 0 incorrect local backref count on 3822448640 root 257 owner 736223 offset 0 found 0 wanted 1 back 0x55f5e1ee4c80 backref disk bytenr does not match extent record, bytenr=3822448640, ref bytenr=0 backpointer mismatch on [3822448640 4096] owner ref check failed [3822448640 4096] ref mismatch on [3822665728 4096] extent item 1, found 0 incorrect local backref count on 3822665728 root 257 owner 736224 offset 0 found 0 wanted 1 back 0x55f5e1ee5bf0 backref disk bytenr does not match extent record, bytenr=3822665728, ref bytenr=0 backpointer mismatch on [3822665728 4096] owner ref check failed [3822665728 4096] ref mismatch on [3823845376 4096] extent item 1, found 0 incorrect local backref count on 3823845376 root 257 owner 736225 offset 0 found 0 wanted 1 back 0x55f5e1754b30 backref disk bytenr does not match extent record, bytenr=3823845376, ref bytenr=0 backpointer mismatch on [3823845376 4096] owner ref check failed [3823845376 4096] ref mismatch on [3824963584 4096] extent item 1, found 0 incorrect local backref count on 3824963584 root 257 owner 736227 offset 0 found 0 wanted 1 back 0x55f5e175adc0 backref disk bytenr does not match extent record, bytenr=3824963584, ref bytenr=0 backpointer mismatch on [3824963584 4096] owner ref check failed [3824963584 4096] ref mismatch on [3825586176 4096] extent item 1, found 0 incorrect local backref count on 3825586176 root 257 owner 736228 offset 0 found 0 wanted 1 back 0x55f5e3999990 backref disk bytenr does not match extent record, bytenr=3825586176, ref bytenr=0 backpointer mismatch on [3825586176 4096] owner ref check failed [3825586176 4096] ref mismatch on [3825590272 4096] extent item 1, found 0 incorrect local backref count on 3825590272 root 257 owner 736229 offset 0 found 0 wanted 1 back 0x55f5e3999ac0 backref disk bytenr does not match extent record, bytenr=3825590272, ref bytenr=0 backpointer mismatch on [3825590272 4096] owner ref check failed [3825590272 4096] ref mismatch on [3825844224 4096] extent item 1, found 0 incorrect local backref count on 3825844224 root 257 owner 736230 offset 0 found 0 wanted 1 back 0x55f5e399b3b0 backref disk bytenr does not match extent record, bytenr=3825844224, ref bytenr=0 backpointer mismatch on [3825844224 4096] owner ref check failed [3825844224 4096] ref mismatch on [3825905664 4096] extent item 1, found 0 incorrect local backref count on 3825905664 root 257 owner 736231 offset 0 found 0 wanted 1 back 0x55f5e399b870 Unhappy as it can be... > Another option is to zero the log tree, which will mean anything that > was being fsync'd at the time is probably lost. It could fix the file > system problem, but then result in user space data loss, depending on > what was happening at the time of the power loss or crash. > > # btrfs rescue zero-log /dev/ There was no important user data that couldn't be lost, so if it allows rescueing the FS, then... [root@zafu ~]# btrfs rescue zero-log /dev/sdb1 parent transid verify failed on 8176123904 wanted 183574 found 183573 parent transid verify failed on 8176123904 wanted 183574 found 183573 Ignoring transid failure Clearing log on /dev/sdb1, previous log_root 8179646464, level 0 [root@zafu ~]# LC_MESSAGES=C mount -t btrfs /dev/sdb1 /mnt/hd mount: /mnt/hd: wrong fs type, bad option, bad superblock on /dev/sdb1, missing codepage or helper program, or other error. [root@zafu ~]# LC_MESSAGES=C mount -t btrfs -o usebackuproot /dev/sdb1 /mnt/hd [root@zafu ~]# mount [...] /dev/sdb1 on /mnt/hd type btrfs (rw,relatime,space_cache,clear_cache,subvolid=5,subvol=/) There it mounts ! [root@zafu ~]# ll /mnt/hd total 0 drwxr-xr-x 1 root root 234 17 janv. 20:18 @ drwxr-xr-x 1 root root 12 14 oct. 2018 @data drwxr-xr-x 1 root root 82 27 juil. 2018 @home drwxr-xr-x 1 root root 210 12 févr. 12:00 timeshift-btrfs [root@zafu ~]# ll /mnt/hd/@ total 16 drwxr-xr-x 1 root root 2534 5 janv. 13:30 bin drwxr-xr-x 1 root root 516 17 janv. 20:19 boot drwxr-xr-x 1 root root 0 22 juil. 2018 cdrom drwxr-xr-x 1 root root 0 14 oct. 2018 data drwxr-xr-x 1 root root 894 22 juil. 2018 dev drwxr-xr-x 1 root root 4476 23 janv. 09:51 etc drwxr-xr-x 1 root root 0 22 juil. 2018 home lrwxrwxrwx 1 root root 32 17 janv. 20:18 initrd.img -> boot/initrd.img-5.3.0-26-generic lrwxrwxrwx 1 root root 32 5 janv. 17:37 initrd.img.old -> boot/initrd.img-5.3.0-24-generic drwxr-xr-x 1 root root 580 6 sept. 2019 lib drwxr-xr-x 1 root root 40 26 juin 2018 lib64 drwxr-xr-x 1 root root 54 10 déc. 2018 media drwxr-xr-x 1 root root 18 22 juil. 2018 mnt drwxr-xr-x 1 root root 60 6 sept. 2019 opt drwxr-xr-x 1 root root 0 24 avril 2018 proc drwx------ 1 root root 190 28 juil. 2018 root drwxr-xr-x 1 root root 156 14 oct. 2018 run drwxr-xr-x 1 root root 4810 5 janv. 13:34 sbin drwxr-xr-x 1 root root 0 26 juin 2018 srv drwxr-xr-x 1 root root 0 24 avril 2018 sys drwxrwxrwt 1 root root 1188 12 févr. 15:30 tmp drwxr-xr-x 1 root root 84 27 avril 2019 usr drwxr-xr-x 1 root root 110 9 déc. 10:08 var lrwxrwxrwx 1 root root 29 17 janv. 20:18 vmlinuz -> boot/vmlinuz-5.3.0-26-generic lrwxrwxrwx 1 root root 29 5 janv. 17:37 vmlinuz.old -> boot/vmlinuz-5.3.0-24-generic [root@zafu ~]# umount /mnt/hd [root@zafu ~]# LC_MESSAGES=C mount -t btrfs /dev/sdb1 /mnt/hd [root@zafu ~]# ll /mnt/hd/@ total 16 drwxr-xr-x 1 root root 2534 5 janv. 13:30 bin drwxr-xr-x 1 root root 516 17 janv. 20:19 boot drwxr-xr-x 1 root root 0 22 juil. 2018 cdrom drwxr-xr-x 1 root root 0 14 oct. 2018 data drwxr-xr-x 1 root root 894 22 juil. 2018 dev drwxr-xr-x 1 root root 4476 23 janv. 09:51 etc drwxr-xr-x 1 root root 0 22 juil. 2018 home lrwxrwxrwx 1 root root 32 17 janv. 20:18 initrd.img -> boot/initrd.img-5.3.0-26-generic lrwxrwxrwx 1 root root 32 5 janv. 17:37 initrd.img.old -> boot/initrd.img-5.3.0-24-generic drwxr-xr-x 1 root root 580 6 sept. 2019 lib drwxr-xr-x 1 root root 40 26 juin 2018 lib64 drwxr-xr-x 1 root root 54 10 déc. 2018 media drwxr-xr-x 1 root root 18 22 juil. 2018 mnt drwxr-xr-x 1 root root 60 6 sept. 2019 opt drwxr-xr-x 1 root root 0 24 avril 2018 proc drwx------ 1 root root 190 28 juil. 2018 root drwxr-xr-x 1 root root 156 14 oct. 2018 run drwxr-xr-x 1 root root 4810 5 janv. 13:34 sbin drwxr-xr-x 1 root root 0 26 juin 2018 srv drwxr-xr-x 1 root root 0 24 avril 2018 sys drwxrwxrwt 1 root root 1188 12 févr. 15:30 tmp drwxr-xr-x 1 root root 84 27 avril 2019 usr drwxr-xr-x 1 root root 110 9 déc. 10:08 var lrwxrwxrwx 1 root root 29 17 janv. 20:18 vmlinuz -> boot/vmlinuz-5.3.0-26-generic lrwxrwxrwx 1 root root 29 5 janv. 17:37 vmlinuz.old -> boot/vmlinuz-5.3.0-24-generic [root@zafu ~]# umount /mnt/hd Looks much happier now ! However : [root@zafu ~]# !523 btrfs check /dev/sdb1 |& head -64 [1/7] checking root items [2/7] checking extents ref mismatch on [3819245568 4096] extent item 1, found 0 incorrect local backref count on 3819245568 root 257 owner 736217 offset 0 found 0 wanted 1 back 0x5559746ca680 backref disk bytenr does not match extent record, bytenr=3819245568, ref bytenr=0 backpointer mismatch on [3819245568 4096] owner ref check failed [3819245568 4096] ref mismatch on [3819421696 4096] extent item 1, found 0 incorrect local backref count on 3819421696 root 257 owner 736218 offset 0 found 0 wanted 1 back 0x5559746cb260 backref disk bytenr does not match extent record, bytenr=3819421696, ref bytenr=0 backpointer mismatch on [3819421696 4096] owner ref check failed [3819421696 4096] ref mismatch on [3821916160 4096] extent item 1, found 0 incorrect local backref count on 3821916160 root 257 owner 736219 offset 0 found 0 wanted 1 back 0x5559755abd60 backref disk bytenr does not match extent record, bytenr=3821916160, ref bytenr=0 backpointer mismatch on [3821916160 4096] owner ref check failed [3821916160 4096] ref mismatch on [3822043136 4096] extent item 1, found 0 incorrect local backref count on 3822043136 root 257 owner 736220 offset 0 found 0 wanted 1 back 0x5559755ac5b0 backref disk bytenr does not match extent record, bytenr=3822043136, ref bytenr=0 backpointer mismatch on [3822043136 4096] owner ref check failed [3822043136 4096] ref mismatch on [3822174208 4096] extent item 1, found 0 incorrect local backref count on 3822174208 root 257 owner 736222 offset 0 found 0 wanted 1 back 0x5559755ad3f0 backref disk bytenr does not match extent record, bytenr=3822174208, ref bytenr=0 backpointer mismatch on [3822174208 4096] owner ref check failed [3822174208 4096] ref mismatch on [3822448640 4096] extent item 1, found 0 incorrect local backref count on 3822448640 root 257 owner 736223 offset 0 found 0 wanted 1 back 0x5559755ae100 backref disk bytenr does not match extent record, bytenr=3822448640, ref bytenr=0 backpointer mismatch on [3822448640 4096] owner ref check failed [3822448640 4096] ref mismatch on [3822665728 4096] extent item 1, found 0 incorrect local backref count on 3822665728 root 257 owner 736224 offset 0 found 0 wanted 1 back 0x5559755af070 backref disk bytenr does not match extent record, bytenr=3822665728, ref bytenr=0 backpointer mismatch on [3822665728 4096] owner ref check failed [3822665728 4096] ref mismatch on [3823845376 4096] extent item 1, found 0 incorrect local backref count on 3823845376 root 257 owner 736225 offset 0 found 0 wanted 1 back 0x555974e2d300 backref disk bytenr does not match extent record, bytenr=3823845376, ref bytenr=0 backpointer mismatch on [3823845376 4096] owner ref check failed [3823845376 4096] ref mismatch on [3824963584 4096] extent item 1, found 0 incorrect local backref count on 3824963584 root 257 owner 736227 offset 0 found 0 wanted 1 back 0x555974e334d0 backref disk bytenr does not match extent record, bytenr=3824963584, ref bytenr=0 backpointer mismatch on [3824963584 4096] owner ref check failed [3824963584 4096] ref mismatch on [3825586176 4096] extent item 1, found 0 incorrect local backref count on 3825586176 root 257 owner 736228 offset 0 found 0 wanted 1 back 0x555977015850 backref disk bytenr does not match extent record, bytenr=3825586176, ref bytenr=0 backpointer mismatch on [3825586176 4096] owner ref check failed [3825586176 4096] ref mismatch on [3825590272 4096] extent item 1, found 0 incorrect local backref count on 3825590272 root 257 owner 736229 offset 0 found 0 wanted 1 back 0x555977015980 backref disk bytenr does not match extent record, bytenr=3825590272, ref bytenr=0 backpointer mismatch on [3825590272 4096] owner ref check failed [3825590272 4096] ref mismatch on [3825844224 4096] extent item 1, found 0 incorrect local backref count on 3825844224 root 257 owner 736230 offset 0 found 0 wanted 1 back 0x555977017150 backref disk bytenr does not match extent record, bytenr=3825844224, ref bytenr=0 backpointer mismatch on [3825844224 4096] owner ref check failed [3825844224 4096] ref mismatch on [3825905664 4096] extent item 1, found 0 incorrect local backref count on 3825905664 root 257 owner 736231 offset 0 found 0 wanted 1 back 0x555977017610 So still not absolutely happy :\ Many thanks however, at least the FS mounts after zeroeing the log... Kind regards. ॐ -- Swâmi Petaramesh <swami@xxxxxxxxxxxxxx> PGP 9076E32E
