------------[ cut here ]------------
BTRFS: Transaction aborted (error -2)
WARNING: fs/btrfs/extent-tree.c:3105 at do_free_extent_accounting fs/btrfs/extent-tree.c:3105 [inline], CPU#0: kworker/u4:9/1080
WARNING: fs/btrfs/extent-tree.c:3105 at __btrfs_free_extent+0x3a28/0x4350 fs/btrfs/extent-tree.c:3474, CPU#0: kworker/u4:9/1080
Modules linked in:
CPU: 0 UID: 0 PID: 1080 Comm: kworker/u4:9 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:do_free_extent_accounting fs/btrfs/extent-tree.c:3105 [inline]
RIP: 0010:__btrfs_free_extent+0x3a2b/0x4350 fs/btrfs/extent-tree.c:3474
Code: c0 05 00 00 e8 96 16 c4 fd 84 c0 0f 84 f3 00 00 00 e8 39 0d df fd e9 a9 05 00 00 e8 2f 0d df fd 48 8d 3d 58 15 34 0c 44 89 ee <67> 48 0f b9 3a e9 af e2 ff ff e8 16 0d df fd eb 05 e8 0f 0d df fd
RSP: 0018:ffffc90001627280 EFLAGS: 00010293
RAX: ffffffff83e68f01 RBX: ffff888011af3060 RCX: ffff88803674a480
RDX: 0000000000000000 RSI: 00000000fffffffe RDI: ffffffff901aa460
RBP: ffffc90001627430 R08: ffff88803674a480 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: ffff888012e0d8f0
R13: 00000000fffffffe R14: 0000000000000000 R15: ffff888040fe0001
FS:  0000000000000000(0000) GS:ffff88808ca5b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000ea000 CR3: 000000001ef33000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 run_one_delayed_ref fs/btrfs/extent-tree.c:-1 [inline]
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:2003 [inline]
 __btrfs_run_delayed_refs+0x15e7/0x4240 fs/btrfs/extent-tree.c:2078
 btrfs_run_delayed_refs+0xe6/0x3b0 fs/btrfs/extent-tree.c:2190
 flush_space+0x28d/0xd80 fs/btrfs/space-info.c:-1
 do_async_reclaim_metadata_space+0x3fc/0x960 fs/btrfs/space-info.c:1187
 btrfs_async_reclaim_metadata_space+0x89/0xe0 fs/btrfs/space-info.c:1254
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	00 00                	add    %al,(%rax)
   2:	e8 96 16 c4 fd       	call   0xfdc4169d
   7:	84 c0                	test   %al,%al
   9:	0f 84 f3 00 00 00    	je     0x102
   f:	e8 39 0d df fd       	call   0xfddf0d4d
  14:	e9 a9 05 00 00       	jmp    0x5c2
  19:	e8 2f 0d df fd       	call   0xfddf0d4d
  1e:	48 8d 3d 58 15 34 0c 	lea    0xc341558(%rip),%rdi        # 0xc34157d
  25:	44 89 ee             	mov    %r13d,%esi
* 28:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2d:	e9 af e2 ff ff       	jmp    0xffffe2e1
  32:	e8 16 0d df fd       	call   0xfddf0d4d
  37:	eb 05                	jmp    0x3e
  39:	e8 0f 0d df fd       	call   0xfddf0d4d