linux-kernel - Re: [syzbot] [bcachefs?] kernel BUG in vfs_get

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Message-ID: <tencent_11342DC56C149450EACEED06CE087BDE6F0A@qq.com>
Date: Wed, 25 Sep 2024 20:09:47 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+c0360e8367d6d8d04a66@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bcachefs?] kernel BUG in vfs_get_tree

db

#syz test

diff --git a/fs/bcachefs/btree_node_scan.c b/fs/bcachefs/btree_node_scan.c
index b28c649c6838..aa247ca6270d 100644
--- a/fs/bcachefs/btree_node_scan.c
+++ b/fs/bcachefs/btree_node_scan.c
@@ -280,7 +280,7 @@ static int read_btree_nodes(struct find_btree_nodes *f)
 			percpu_ref_put(&ca->io_ref);
 			closure_put(&cl);
 			f->ret = ret;
-			bch_err(c, "error starting kthread: %i", ret);
+			bch_err(c, "error starting kthread: %i %d", ret, PTR_ERR(t));
 			break;
 		}
 	}
@@ -358,6 +358,7 @@ int bch2_scan_for_btree_nodes(struct bch_fs *c)
 	mutex_init(&f->lock);
 
 	ret = read_btree_nodes(f);
+	pr_info("ret: %d, %s\n", ret, __func__);
 	if (ret)
 		return ret;
 
diff --git a/fs/bcachefs/fs.c b/fs/bcachefs/fs.c
index 4a1bb07a2574..49d711e9837e 100644
--- a/fs/bcachefs/fs.c
+++ b/fs/bcachefs/fs.c
@@ -2148,6 +2148,7 @@ static int bch2_fs_get_tree(struct fs_context *fc)
 out:
 	fc->root = dget(sb->s_root);
 err:
+	pr_info("ret: %d, sb: %p, fc: %p, fcroot: %p, %s\n", ret, sb, fc, fc->root, __func__);
 	darray_exit(&devs_to_fs);
 	bch2_darray_str_exit(&devs);
 	if (ret)
diff --git a/fs/bcachefs/recovery.c b/fs/bcachefs/recovery.c
index be1e7ca4362f..aeeeda0f01d4 100644
--- a/fs/bcachefs/recovery.c
+++ b/fs/bcachefs/recovery.c
@@ -522,8 +522,8 @@ static int read_btree_roots(struct bch_fs *c)
 					bch2_btree_id_str(i)) ||
 		    mustfix_fsck_err_on((ret = r->error = bch2_btree_root_read(c, i, &r->key, r->level)),
 					c, btree_root_read_error,
-					"error reading btree root %s l=%u: %s",
-					bch2_btree_id_str(i), r->level, bch2_err_str(ret))) {
+					"error reading btree root %s l=%u: %s ret: %d",
+					bch2_btree_id_str(i), r->level, bch2_err_str(ret), ret)) {
 			if (btree_id_is_alloc(i)) {
 				c->opts.recovery_passes |= BIT_ULL(BCH_RECOVERY_PASS_check_allocations);
 				c->opts.recovery_passes |= BIT_ULL(BCH_RECOVERY_PASS_check_alloc_info);
@@ -849,6 +849,7 @@ int bch2_fs_recovery(struct bch_fs *c)
 		atomic64_add(1 << 16, &c->key_version);
 
 	ret = read_btree_roots(c);
+	pr_info("ret: %d, %s\n", ret, __func__);
 	if (ret)
 		goto err;
 
@@ -967,6 +968,7 @@ int bch2_fs_recovery(struct bch_fs *c)
 
 	ret = 0;
 out:
+	pr_info("out ret: %d, %s\n", ret, __func__);
 	bch2_flush_fsck_errs(c);
 
 	if (!c->opts.retain_recovery_info) {
diff --git a/fs/bcachefs/super.c b/fs/bcachefs/super.c
index 873e4be7e1dc..74d0af559a77 100644
--- a/fs/bcachefs/super.c
+++ b/fs/bcachefs/super.c
@@ -1036,6 +1036,7 @@ int bch2_fs_start(struct bch_fs *c)
 	ret = BCH_SB_INITIALIZED(c->disk_sb.sb)
 		? bch2_fs_recovery(c)
 		: bch2_fs_initialize(c);
+	pr_info("2ret: %d, %s\n", ret, __func__);
 	if (ret)
 		goto err;