Hi Qu, thank you, but unfortunately that didn't work out so well. The tree dump was no problem [1], but clearing the space cache resulted in a core dump. Now btrfs check --readonly reports some errors. I attached the output of these commands.
Thorsten [1] https://gist.github.com/thorstenhirsch/65d4308ce54729c902cb09c0d4ad2baf # btrfs check --clear-space-cache v1 /dev/nvme0n1p3 Opening filesystem to check... Checking filesystem on /dev/nvme0n1p3 UUID: 4284a794-ad75-450d-b023-ebc5e75f31f5 Failed to find [544448348160, 168, 16384] btrfs unable to find ref byte nr 544448364544 parent 0 root 2 owner 0 offset 0 transaction.c:195: btrfs_commit_transaction: BUG_ON `ret` triggered, value -5 btrfs(+0x3be68)[0x556936269e68] btrfs(btrfs_commit_transaction+0x12a)[0x55693626a2ec] btrfs(btrfs_clear_free_space_cache+0x32a)[0x55693625fecf] btrfs(+0x4be5b)[0x556936279e5b] btrfs(cmd_check+0x5c2)[0x556936284d86] btrfs(main+0x1f6)[0x556936241ef6] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb)[0x7fb9a7911b6b] btrfs(_start+0x2a)[0x556936241f3a] Aborted (core dumped) # btrfs check --readonly /dev/nvme0n1p3 Opening filesystem to check... parent transid verify failed on 419860414464 wanted 30188 found 30105 parent transid verify failed on 419860414464 wanted 30188 found 30105 Ignoring transid failure Checking filesystem on /dev/nvme0n1p3 UUID: 4284a794-ad75-450d-b023-ebc5e75f31f5 [1/7] checking root items [2/7] checking extents ref mismatch on [544448348160 16384] extent item 1, found 0 backref 544448348160 root 2 not referenced back 0x563ce432f010 incorrect global backref count on 544448348160 found 1 wanted 0 backpointer mismatch on [544448348160 16384] owner ref check failed [544448348160 16384] ref mismatch on [544448364544 16384] extent item 0, found 1 tree backref 544448364544 parent 2 root 2 not found in extent tree backpointer mismatch on [544448364544 16384] ERROR: errors found in extent allocation tree or chunk allocation [3/7] checking free space cache cache and super generation don't match, space cache will be invalidated [4/7] checking fs roots [5/7] checking only csums items (without verifying data) [6/7] checking root refs [7/7] checking quota groups skipped (not enabled on this FS) ERROR: transid errors in file system found 275464060928 bytes used, error(s) found total csum bytes: 266882612 total tree bytes: 1513570304 total fs tree bytes: 1135788032 total extent tree bytes: 73220096 btree space waste bytes: 236694654 file data blocks allocated: 1962517999616 referenced 221128466432
