======================================================
WARNING: possible circular locking dependency detected
6.5.0-rc7-syzkaller-00024-g93f5de5f648d #0 Not tainted
------------------------------------------------------
syz-executor.3/18729 is trying to acquire lock:
ffff88807348f9f0 (&delayed_node->mutex){+.+.}-{3:3}, at: __btrfs_release_delayed_node+0x9a/0xaa0 fs/btrfs/delayed-inode.c:256

but task is already holding lock:
ffff888023a702c8 (btrfs-tree-00){++++}-{3:3}, at: __btrfs_tree_lock+0x3c/0x2a0 fs/btrfs/locking.c:198

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (btrfs-tree-00){++++}-{3:3}:
       __lock_release kernel/locking/lockdep.c:5475 [inline]
       lock_release+0x36f/0x9d0 kernel/locking/lockdep.c:5781
       up_read+0x16/0x20 kernel/locking/rwsem.c:1615
       btrfs_tree_unlock_rw fs/btrfs/locking.h:191 [inline]
       btrfs_search_slot+0xd70/0x2f80 fs/btrfs/ctree.c:2221
       btrfs_lookup_inode+0xdc/0x480 fs/btrfs/inode-item.c:412
       __btrfs_update_delayed_inode+0x1ef/0xad0 fs/btrfs/delayed-inode.c:1018
       btrfs_update_delayed_inode fs/btrfs/delayed-inode.c:1099 [inline]
       __btrfs_commit_inode_delayed_items+0x228e/0x2410 fs/btrfs/delayed-inode.c:1119
       __btrfs_run_delayed_items+0x1db/0x430 fs/btrfs/delayed-inode.c:1153
       btrfs_commit_transaction+0x859/0x2ff0 fs/btrfs/transaction.c:2276
       sync_filesystem+0x1c0/0x220 fs/sync.c:66
       generic_shutdown_super+0x6f/0x340 fs/super.c:472
       kill_anon_super+0x3b/0x60 fs/super.c:1110
       btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2138
       deactivate_locked_super+0xa4/0x110 fs/super.c:330
       cleanup_mnt+0x426/0x4c0 fs/namespace.c:1254
       task_work_run+0x24a/0x300 kernel/task_work.c:179
       resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
       exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171
       exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
       __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
       syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:297
       do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&delayed_node->mutex){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3142 [inline]
       check_prevs_add kernel/locking/lockdep.c:3261 [inline]
       validate_chain kernel/locking/lockdep.c:3876 [inline]
       __lock_acquire+0x39ff/0x7f70 kernel/locking/lockdep.c:5144
       lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5761
       __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
       __btrfs_release_delayed_node+0x9a/0xaa0 fs/btrfs/delayed-inode.c:256
       btrfs_release_delayed_node fs/btrfs/delayed-inode.c:281 [inline]
       __btrfs_run_delayed_items+0x2b5/0x430 fs/btrfs/delayed-inode.c:1156
       btrfs_commit_transaction+0x859/0x2ff0 fs/btrfs/transaction.c:2276
       btrfs_sync_file+0xf56/0x1330 fs/btrfs/file.c:1988
       vfs_fsync_range fs/sync.c:188 [inline]
       vfs_fsync fs/sync.c:202 [inline]
       do_fsync fs/sync.c:212 [inline]
       __do_sys_fsync fs/sync.c:220 [inline]
       __se_sys_fsync fs/sync.c:218 [inline]
       __x64_sys_fsync+0x196/0x1e0 fs/sync.c:218
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(btrfs-tree-00);
                               lock(&delayed_node->mutex);
                               lock(btrfs-tree-00);
  lock(&delayed_node->mutex);

 *** DEADLOCK ***

3 locks held by syz-executor.3/18729:
 #0: ffff88801774e370 (btrfs_trans_num_writers){++++}-{0:0}, at: spin_unlock include/linux/spinlock.h:391 [inline]
 #0: ffff88801774e370 (btrfs_trans_num_writers){++++}-{0:0}, at: join_transaction+0xb87/0xe00 fs/btrfs/transaction.c:287
 #1: ffff88801774e398 (btrfs_trans_num_extwriters){++++}-{0:0}, at: join_transaction+0xbb2/0xe00 fs/btrfs/transaction.c:288
 #2: ffff888023a702c8 (btrfs-tree-00){++++}-{3:3}, at: __btrfs_tree_lock+0x3c/0x2a0 fs/btrfs/locking.c:198

stack backtrace:
CPU: 0 PID: 18729 Comm: syz-executor.3 Not tainted 6.5.0-rc7-syzkaller-00024-g93f5de5f648d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 check_noncircular+0x375/0x4a0 kernel/locking/lockdep.c:2195
 check_prev_add kernel/locking/lockdep.c:3142 [inline]
 check_prevs_add kernel/locking/lockdep.c:3261 [inline]
 validate_chain kernel/locking/lockdep.c:3876 [inline]
 __lock_acquire+0x39ff/0x7f70 kernel/locking/lockdep.c:5144
 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5761
 __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
 __btrfs_release_delayed_node+0x9a/0xaa0 fs/btrfs/delayed-inode.c:256
 btrfs_release_delayed_node fs/btrfs/delayed-inode.c:281 [inline]
 __btrfs_run_delayed_items+0x2b5/0x430 fs/btrfs/delayed-inode.c:1156
 btrfs_commit_transaction+0x859/0x2ff0 fs/btrfs/transaction.c:2276
 btrfs_sync_file+0xf56/0x1330 fs/btrfs/file.c:1988
 vfs_fsync_range fs/sync.c:188 [inline]
 vfs_fsync fs/sync.c:202 [inline]
 do_fsync fs/sync.c:212 [inline]
 __do_sys_fsync fs/sync.c:220 [inline]
 __se_sys_fsync fs/sync.c:218 [inline]
 __x64_sys_fsync+0x196/0x1e0 fs/sync.c:218
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff87027cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff870f4c0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000004a
RAX: ffffffffffffffda RBX: 00007ff87039c120 RCX: 00007ff87027cae9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007ff8702c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007ff87039c120 R15: 00007ffefe628528
 </TASK>
------------[ cut here ]------------
BTRFS: Transaction aborted (error -17)
WARNING: CPU: 0 PID: 18729 at fs/btrfs/delayed-inode.c:1158 __btrfs_run_delayed_items+0x3d3/0x430 fs/btrfs/delayed-inode.c:1158
Modules linked in:
CPU: 0 PID: 18729 Comm: syz-executor.3 Not tainted 6.5.0-rc7-syzkaller-00024-g93f5de5f648d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:__btrfs_run_delayed_items+0x3d3/0x430 fs/btrfs/delayed-inode.c:1158
Code: fe c1 38 c1 0f 8c b5 fc ff ff 48 89 ef e8 55 66 43 fe e9 a8 fc ff ff e8 9b 94 ea fd 48 c7 c7 60 93 4b 8b 89 de e8 0d ae b1 fd <0f> 0b e9 69 ff ff ff f3 0f 1e fa e8 7d 94 ea fd 48 8b 44 24 10 42
RSP: 0018:ffffc90015f67950 EFLAGS: 00010246
RAX: 02f1c0fb0da9f300 RBX: 00000000ffffffef RCX: ffff88803b8dd940
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff88803c909220 R08: ffffffff8152d442 R09: 1ffff92002becedc
R10: dffffc0000000000 R11: fffff52002becedd R12: dffffc0000000000
R13: ffff88803c9091f8 R14: 0000000000000000 R15: ffff88803c909220
FS:  00007ff870f4c6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb32c20ed58 CR3: 0000000035af7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_commit_transaction+0x859/0x2ff0 fs/btrfs/transaction.c:2276
 btrfs_sync_file+0xf56/0x1330 fs/btrfs/file.c:1988
 vfs_fsync_range fs/sync.c:188 [inline]
 vfs_fsync fs/sync.c:202 [inline]
 do_fsync fs/sync.c:212 [inline]
 __do_sys_fsync fs/sync.c:220 [inline]
 __se_sys_fsync fs/sync.c:218 [inline]
 __x64_sys_fsync+0x196/0x1e0 fs/sync.c:218
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff87027cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff870f4c0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000004a
RAX: ffffffffffffffda RBX: 00007ff87039c120 RCX: 00007ff87027cae9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007ff8702c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007ff87039c120 R15: 00007ffefe628528
 </TASK>