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

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Message-ID: <tencent_A7941CEA22EDEACFC87A5A6C242D5D6E780A@qq.com>
Date: Wed, 23 Oct 2024 18:18:05 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+5d2b33d7835870519b5f@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] general protection fault in btrfs_lookup_csums_bitmap

Did we load the csum root?

#syz test

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 3a3427428074..1ba4d8ba902b 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1602,7 +1602,8 @@ static int scrub_find_fill_first_stripe(struct btrfs_block_group *bg,
 	}
 
 	/* Now fill the data csum. */
-	if (bg->flags & BTRFS_BLOCK_GROUP_DATA) {
+	if (!test_bit(BTRFS_FS_STATE_NO_DATA_CSUMS, &fs_info->fs_state) &&
+	    bg->flags & BTRFS_BLOCK_GROUP_DATA) {
 		int sector_nr;
 		unsigned long csum_bitmap = 0;