bcachefs
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koverstreet
FS Crash, kernel BUG at src/fs/bcachefs/vfs/fs.c:983
Hi, I was using bcachefs on my /home partition, and the filesystem went into read-only with a crash. My root partition, which was also bcachefs, was fine.
I was playing a game with my friend, and wanted to backup the save file. I copy and pasted the 3 save files, and after a few seconds, the game crashed. I thought it was a game issue, until I realized things started breaking.
After a reboot, the filesystem mounted fine, and just in case, I did an fsck, it went well and it's up and running.
I also managed to save the last parts of dmesg. I'm not sure if this is a valid bug report or not, though.
bcachefs show-super
~> sudo bcachefs show-super /dev/nvme0n1p3
External UUID: d5d4dc4b-d6df-4acf-8571-4f26f68352d5
Internal UUID: 834dd15d-184d-4306-91c4-9a11fd143ca3
Magic number: c68573f6-66ce-90a9-d96a-60cf803df7ef
Device index: 0
Label: (none)
Version: reconcile (1.33)
Incompatible features allowed: reconcile (1.33)
Incompatible features in use: reconcile (1.33)
Version upgrade complete: reconcile (1.33)
Oldest version on disk: inode_has_child_snapshots (1.13)
Created: Sat Jan 25 15:46:47 2025
Sequence number: 4666
Time of last write: Tue Dec 9 00:17:44 2025
Superblock size: 6.76k/1.00M
Clean: 0
Devices: 1
Sections: replicas_v0,clean,journal_seq_blacklist,journal_v2,counters,members_v2,errors,ext,downgrade,recovery_passes,extent_type_u64s
Features: journal_seq_blacklist_v3,reflink,new_siphash,inline_data,new_extent_overwrite,btree_ptr_v2,extents_above_btree_updates,btree_updates_journalled,reflink_inline_data,new_varint,journal_no_flush,alloc_v2,extents_across_btree_nodes,incompat_version_field,casefolding
Compat features: alloc_info,alloc_metadata,extents_above_btree_updates_done,bformat_overflow_done,no_stale_ptrs
Options:
block_size: 512
btree_node_size: 256k
errors: continue [fix_safe] panic ro
write_error_timeout: 30
metadata_replicas: 1
data_replicas: 1
metadata_replicas_required: 1
data_replicas_required: 1
encoded_extent_max: 64.0k
metadata_checksum: none [crc32c] crc64 xxhash
data_checksum: none [crc32c] crc64 xxhash
checksum_err_retry_nr: 3
compression: none
background_compression: none
str_hash: crc32c crc64 [siphash]
metadata_target: none
foreground_target: none
background_target: none
promote_target: none
erasure_code: 0
casefold: 0
inodes_32bit: 1
shard_inode_numbers_bits: 4
gc_reserve_percent: 8
gc_reserve_bytes: 0
root_reserve_percent: 0
wide_macs: 0
promote_whole_extents: 1
acl: 1
usrquota: 0
grpquota: 0
prjquota: 0
degraded: [ask] yes very no
journal_flush_delay: 1000
journal_flush_disabled: 0
journal_reclaim_delay: 100
writeback_timeout: 0
journal_transaction_names: 1
allocator_stuck_timeout: 30
version_upgrade: compatible [incompatible] none
nocow: 0
reconcile_on_ac_only: 0
errors (size 184):
hash_table_key_wrong_offset 3 Tue Dec 9 00:16:26 2025
need_discard_key_wrong 28 Thu Nov 20 23:52:09 2025
ptr_to_missing_backpointer 2725344 Sun Nov 16 13:58:51 2025
backpointer_to_missing_ptr 3592 Sat Nov 15 23:44:06 2025
alloc_key_data_type_wrong 29 Wed Oct 1 22:19:22 2025
alloc_key_dirty_sectors_wrong 29 Wed Oct 1 22:19:22 2025
btree_node_topology_bad_min_key 1 Wed Oct 1 22:19:04 2025
accounting_key_junk_at_end 159156935 Wed Oct 1 17:55:53 2025
backpointer_bucket_offset_wrong 20 Tue Sep 30 17:26:02 2025
vfs_bad_inode_rm 2 Wed Aug 27 01:14:50 2025
inode_dir_has_nonzero_i_size 752 Wed Jul 30 22:25:31 2025
ext (size 96):
Recovery passes required:
Errors to silently fix:
Btrees with missing data:
Device 0: /dev/nvme0n1p3 WDC PC SN530 SDBPNPZ-512G-1002
Label: (none)
UUID: 331faff1-577c-4a06-8838-322d5b23983f
Size: 356G
read errors: 0
write errors: 0
checksum errors: 0
seqread iops: 0
seqwrite iops: 0
randread iops: 0
randwrite iops: 0
Bucket size: 256k
First bucket: 0
Buckets: 1460824
Last mount: Tue Dec 9 00:17:36 2025
Last superblock write: 4666
State: rw
Data allowed: journal,btree,user
Has data: journal,btree,user
Rotational: 0
Btree allocated bitmap blocksize: 8.00M
Btree allocated bitmap: 0010000000000000000000000000000000000000000000000000100000000101
Durability: 1
Discard: 0
Freespace initialized: 1
Resize on mount: 0
Last device name: nvme0n1p3
Last device model:
System info:
Distro: Gentoo Linux CPU: AMD Ryzen 5 4600HS GPU: NVIDIA GTX 1650 Ti RAM: 16 GB
