Hi, I recently got the following error in dmesg while taking an incremental backup of my data:
[26876.491167] BTRFS critical (device dm-0): corrupt leaf: root=258 block=739531833344 slot=0 ino=19366566, invalid mode: has 00 expect valid S_IF* bit(s) [26876.491171] BTRFS error (device dm-0): block=739531833344 read time tree block corruption detected It is triggered whenever stat() is called on one of these files: $ ls -lR >/dev/null ls: cannot access './<redacted a>/2018-05-31.220504+1000AEST.html': Input/output error ls: cannot access './<redacted b>/2018-05-31.200836+1000AEST.html': Input/output error ls: cannot access './<redacted c>/2018-05-31.201834+1000AEST.html': Input/output error ls: cannot access './<redacted d>/2018-05-31.222947+1000AEST.html': Input/output error https://btrfs.wiki.kernel.org/index.php/Tree-checker#How_to_handle_such_error tells me to post on this mailing list upon getting such an error, so here I am. What's happened? How can I fix this? Should I just restore from backup? Various diagnostic command outputs: $ uname -a Linux home.kota.moe 5.2.0-3-rt-amd64 #1 SMP PREEMPT RT Debian 5.2.17-1 (2019-09-26) x86_64 GNU/Linux $ btrfs --version btrfs-progs v5.2.1 $ sudo btrfs filesystem show Label: none uuid: 909c3fad-bc84-4b62-8090-ad1ae46f925e Total devices 2 FS bytes used 191.27GiB devid 1 size 200.00GiB used 197.03GiB path /dev/mapper/home-dom0 devid 2 size 200.00GiB used 197.03GiB path /dev/mapper/home-dom0--mirror $ sudo btrfs filesystem df . Data, RAID1: total=193.00GiB, used=188.50GiB System, RAID1: total=32.00MiB, used=48.00KiB Metadata, RAID1: total=4.00GiB, used=2.77GiB GlobalReserve, single: total=385.31MiB, used=0.00B $ diff -u <(sudo btrfs ins dump-tree -b 739531833344 /dev/home/dom0) <(sudo btrfs ins dump-tree -b 739531833344 /dev/home/dom0-mirror) $ sudo btrfs ins dump-tree -b 739531833344 /dev/home/dom0 (See attached file)
dump-tree-dom0
Description: Binary data
