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btrfs: output extra debug info if we failed to find an inline backref

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[BUG]
Syzbot reported several warning triggered inside
lookup_inline_extent_backref().

[CAUSE]
As usual, the reproducer doesn't reliably trigger locally here, but at
least we know the WARN_ON() is triggered when an inline backref can not
be found, and it can only be triggered when @insert is true. (I.e.
inserting a new inline backref, which means the backref should already
exist)

[ENHANCEMENT]
After the WARN_ON(), dump all the parameters and the extent tree
leaf to help debug.

Link: https://syzkaller.appspot.com/bug?extid=d6f9ff86c1d804ba2bc6
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2023-08-01 19:02:28 +08:00 • committed by David Sterba
parent 76c5126e76
commit 7f72f50547
1 changed files with 5 additions and 0 deletions
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5
fs/btrfs/extent-tree.c
View file

@ -848,6 +848,11 @@ again:
err = -ENOENT; err = -ENOENT;
goto out; goto out;
} else if (WARN_ON(ret)) { } else if (WARN_ON(ret)) {
btrfs_print_leaf(path->nodes[0]);
btrfs_err(fs_info,
"extent item not found for insert, bytenr %llu num_bytes %llu parent %llu root_objectid %llu owner %llu offset %llu",
bytenr, num_bytes, parent, root_objectid, owner,
offset);
err = -EIO; err = -EIO;
goto out; goto out;
} }