------------[ cut here ]------------
WARNING: CPU: 1 PID: 46 at fs/btrfs/block-rsv.c:515 btrfs_use_block_rsv+0x688/0x7f0 fs/btrfs/block-rsv.c:515
Modules linked in:
CPU: 1 PID: 46 Comm: kworker/u17:2 Not tainted 6.5.0-rc7-syzkaller-00182-g3b35375f19fe #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: btrfs-endio-write btrfs_work_helper
RIP: 0010:btrfs_use_block_rsv+0x688/0x7f0 fs/btrfs/block-rsv.c:515
Code: 89 ea 83 e2 07 38 d0 7f 0c 84 c0 74 08 48 89 ef e8 ed 42 47 fe 0f b6 73 5a ba e4 ff ff ff 48 c7 c7 00 e4 b7 8a e8 b8 b8 ba fd <0f> 0b e9 a3 fd ff ff e8 8c f7 f3 fd 49 8d 9d 80 04 00 00 e9 1c fb
RSP: 0018:ffffc90000c07030 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff88802f421748 RCX: 0000000000000000
RDX: ffff8880173b8c80 RSI: ffffffff814be3c6 RDI: 0000000000000001
RBP: ffff88802f4217a2 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 000000002d2d2d2d R12: 0000000000001000
R13: ffff88810c9ac000 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88806b700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f2784b0b48 CR3: 0000000105da3000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_alloc_tree_block+0x1dd/0x1420 fs/btrfs/extent-tree.c:4883
 __btrfs_cow_block+0x3ce/0x18e0 fs/btrfs/ctree.c:546
 btrfs_cow_block+0x2f1/0x820 fs/btrfs/ctree.c:712
 btrfs_search_slot+0x12a0/0x30e0 fs/btrfs/ctree.c:2194
 btrfs_lookup_file_extent+0xcb/0x110 fs/btrfs/file-item.c:270
 btrfs_drop_extents+0x433/0x2bd0 fs/btrfs/file.c:250
 insert_reserved_file_extent+0x3a8/0x940 fs/btrfs/inode.c:3057
 insert_ordered_extent_file_extent fs/btrfs/inode.c:3164 [inline]
 btrfs_finish_one_ordered+0x1443/0x2240 fs/btrfs/inode.c:3268
 btrfs_work_helper+0x20b/0xba0 fs/btrfs/async-thread.c:314
 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2600
 worker_thread+0x687/0x1110 kernel/workqueue.c:2751
 kthread+0x33a/0x430 kernel/kthread.c:389
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>