Re: [syzbot] Re: [btrfs?] kernel BUG in btrfs_get_ordered_extents_for_logging

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@xxxxxxxxxxxxxxx.

***

Subject: Re: [btrfs?] kernel BUG in btrfs_get_ordered_extents_for_logging
Author: lizhi.xu@xxxxxxxxxxxxx

or i_mmap_lock ?

#syz test

diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index 82a68394a89c..d0187e1fb941 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -1015,7 +1015,8 @@ void btrfs_get_ordered_extents_for_logging(struct btrfs_inode *inode,
 {
 	struct rb_node *n;
 
-	ASSERT(inode_is_locked(&inode->vfs_inode));
+	ASSERT(inode_is_locked(&inode->vfs_inode) ||
+	       rwsem_is_locked(&inode->i_mmap_lock));
 
 	spin_lock_irq(&inode->ordered_tree_lock);
 	for (n = rb_first(&inode->ordered_tree); n; n = rb_next(n)) {