------------[ cut here ]------------
btrfs_abort_should_print_stack(__error)
WARNING: fs/btrfs/extent-tree.c:3429 at __btrfs_free_extent+0x1fd1/0x39c0 fs/btrfs/extent-tree.c:3429, CPU#0: kworker/u4:4/52
Modules linked in:
CPU: 0 UID: 0 PID: 52 Comm: kworker/u4:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:__btrfs_free_extent+0x1fd1/0x39c0 fs/btrfs/extent-tree.c:3429
Code: b8 d3 fd 45 85 f6 0f 85 e0 05 00 00 e8 a8 b4 d3 fd e9 47 09 00 00 e8 9e b4 d3 fd eb 10 e8 97 b4 d3 fd eb 09 e8 90 b4 d3 fd 90 <0f> 0b 90 4c 8b 7c 24 10 44 89 e1 f7 d9 e9 93 e7 ff ff e8 f8 0c c4
RSP: 0018:ffffc90000adf280 EFLAGS: 00010293
RAX: ffffffff83f2bd80 RBX: ffff888052d4c001 RCX: ffff888000af2540
RDX: 0000000000000000 RSI: ffffffff8ef7b4a0 RDI: 00000000ffffffe4
RBP: ffffc90000adf430 R08: ffff888000af2540 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: 00000000ffffffe4
R13: ffff88801aa8a8d0 R14: dffffc0000000000 R15: 00000000ffffffe4
FS:  0000000000000000(0000) GS:ffff88808c815000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9fbe593ec0 CR3: 0000000011a43000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 run_delayed_tree_ref fs/btrfs/extent-tree.c:1824 [inline]
 run_one_delayed_ref fs/btrfs/extent-tree.c:1851 [inline]
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:2058 [inline]
 __btrfs_run_delayed_refs+0x166c/0x43b0 fs/btrfs/extent-tree.c:2134
 btrfs_run_delayed_refs+0xdc/0x2a0 fs/btrfs/extent-tree.c:2246
 flush_space+0x56d/0xde0 fs/btrfs/space-info.c:-1
 do_async_reclaim_metadata_space+0x3e8/0x940 fs/btrfs/space-info.c:1211
 btrfs_async_reclaim_metadata_space+0x89/0xe0 fs/btrfs/space-info.c:1278
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>