Bug 203621 - filefrag on ro-blockdevice btrfs causes delayed_refs has NO entry / btrfs_update_root:136: Aborting unused transaction(No space left).
Summary: filefrag on ro-blockdevice btrfs causes delayed_refs has NO entry / btrfs_upd...
Status: NEW
Alias: None
Product: File System
Classification: Unclassified
Component: btrfs (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: BTRFS virtual assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-05-16 09:11 UTC by Christoph Anton Mitterer
Modified: 2019-05-16 09:11 UTC (History)
0 users

See Also:
Kernel Version: 4.19.37
Tree: Mainline
Regression: No

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Description Christoph Anton Mitterer 2019-05-16 09:11:30 UTC 
from: https://www.spinics.net/lists/linux-btrfs/msg87585.html

As described in the thread above (log messages attached there), when filefrag is used on a btrfs which is on a blockdevice that is set readonly, it leads errors like:
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): Skipping commit of aborted transaction.
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): cleanup_transaction:1846: Aborting unused transaction(No space left).
Mar 16 18:27:28 heisenberg kernel: BTRFS info (device dm-2): delayed_refs has NO entry
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): btrfs_update_root:136: Aborting unused transaction(No space left).
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): Skipping commit of aborted transaction.
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): cleanup_transaction:1846: Aborting unused transaction(No space left).
Mar 16 18:27:28 heisenberg kernel: BTRFS info (device dm-2): delayed_refs has NO entry
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): btrfs_update_root:136: Aborting unused transaction(No space left).
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): Skipping commit of aborted transaction.
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): cleanup_transaction:1846: Aborting unused transaction(No space left).
Mar 16 18:27:28 heisenberg kernel: BTRFS info (device dm-2): delayed_refs has NO entry
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): btrfs_update_root:136: Aborting unused transaction(No space left).
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): Skipping commit of aborted transaction.
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): cleanup_transaction:1846: Aborting unused transaction(No space left).
Mar 16 18:27:28 heisenberg kernel: BTRFS info (device dm-2): delayed_refs has NO entry
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): btrfs_update_root:136: Aborting unused transaction(No space left).
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): Skipping commit of aborted transaction.
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): cleanup_transaction:1846: Aborting unused transaction(No space left).
Mar 16 18:27:28 heisenberg kernel: BTRFS info (device dm-2): delayed_refs has NO entry
Mar 16 18:27:28 heisenberg kernel: BTRFS warning (device dm-2): btrfs_update_root:136: Aborting unused transaction(No space left).
Mar 16 18:27:28 heisenberg kernel: BTRFS info (device dm-2): delayed_refs has NO entry

See https://www.spinics.net/lists/linux-btrfs/msg88573.html for a reproducer.
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