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btrfs: print leaked references in kill_all_delayed_nodes()

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We are seeing soft lockups in kill_all_delayed_nodes due to a
delayed_node with a lingering reference count of 1. Printing at this
point will reveal the guilty stack trace. If the delayed_node has no
references there should be no output.

Signed-off-by: Leo Martins <loemra.dev@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Leo Martins 2025-08-12 16:04:40 -07:00 committed by David Sterba
parent e8513c012d
commit b767a28d61
2 changed files with 9 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
fs/btrfs/delayed-inode.c
View file

@ -2112,6 +2112,7 @@ void btrfs_kill_all_delayed_nodes(struct btrfs_root *root)
__btrfs_kill_delayed_node(delayed_nodes[i]);
btrfs_release_delayed_node(delayed_nodes[i],
&delayed_node_trackers[i]);
btrfs_delayed_node_ref_tracker_dir_print(delayed_nodes[i]);
}
}
}

8
fs/btrfs/delayed-inode.h
View file

@ -208,6 +208,12 @@ static inline void btrfs_delayed_node_ref_tracker_dir_exit(struct btrfs_delayed_
ref_tracker_dir_exit(&node->ref_dir.dir);
}
static inline void btrfs_delayed_node_ref_tracker_dir_print(struct btrfs_delayed_node *node)
{
ref_tracker_dir_print(&node->ref_dir.dir,
BTRFS_DELAYED_NODE_REF_TRACKER_DISPLAY_LIMIT);
}
static inline int btrfs_delayed_node_ref_tracker_alloc(struct btrfs_delayed_node *node,
struct btrfs_ref_tracker *tracker,
gfp_t gfp)
@ -225,6 +231,8 @@ static inline void btrfs_delayed_node_ref_tracker_dir_init(struct btrfs_delayed_
static inline void btrfs_delayed_node_ref_tracker_dir_exit(struct btrfs_delayed_node *node) { }
static inline void btrfs_delayed_node_ref_tracker_dir_print(struct btrfs_delayed_node *node) { }
static inline int btrfs_delayed_node_ref_tracker_alloc(struct btrfs_delayed_node *node,
struct btrfs_ref_tracker *tracker,
gfp_t gfp)