linux-kernel - Re: [syzbot] [btrfs?] general protection fault in create_empty

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Message-ID: <tencent_185D9A5DB49905CF898D84A5B00DE3127A07@qq.com>
Date: Fri,  9 Jan 2026 19:14:48 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+b4a2af3000eaa84d95d5@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] general protection fault in create_empty_buffers (5)

#syz test

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 13c514684cfb..eee7471a3e03 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1339,6 +1339,7 @@ struct btrfs_super_block *btrfs_read_disk_super(struct block_device *bdev,
 	struct page *page;
 	u64 bytenr, bytenr_orig;
 	struct address_space *mapping = bdev->bd_mapping;
+	struct inode *inode = mapping->host;
 	int ret;
 
 	bytenr_orig = btrfs_sb_offset(copy_num);
@@ -1364,7 +1365,9 @@ struct btrfs_super_block *btrfs_read_disk_super(struct block_device *bdev,
 				      (bytenr + BTRFS_SUPER_INFO_SIZE) >> PAGE_SHIFT);
 	}
 
+	inode_lock(inode);
 	page = read_cache_page_gfp(mapping, bytenr >> PAGE_SHIFT, GFP_NOFS);
+	inode_unlock(inode);
 	if (IS_ERR(page))
 		return ERR_CAST(page);