------------[ cut here ]------------
BTRFS: Transaction aborted (error -2)
WARNING: fs/btrfs/extent-tree.c:3181 at do_free_extent_accounting fs/btrfs/extent-tree.c:3181 [inline], CPU#0: kworker/u4:5/74
WARNING: fs/btrfs/extent-tree.c:3181 at __btrfs_free_extent+0x3c6e/0x4570 fs/btrfs/extent-tree.c:3554, CPU#0: kworker/u4:5/74
Modules linked in:
CPU: 0 UID: 0 PID: 74 Comm: kworker/u4:5 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:3181 [inline]
RIP: 0010:__btrfs_free_extent+0x3c70/0x4570 fs/btrfs/extent-tree.c:3554
Code: e9 c8 05 00 00 e8 10 86 c2 fd 84 c0 0f 84 f2 00 00 00 e8 03 6a dd fd e9 b1 05 00 00 e8 f9 69 dd fd 48 8d 3d 12 82 54 0c 89 de <67> 48 0f b9 3a e9 c1 e0 ff ff e8 e1 69 dd fd eb 05 e8 da 69 dd fd
RSP: 0018:ffffc90000b5f260 EFLAGS: 00010293
RAX: ffffffff83e7b9c7 RBX: 00000000fffffffe RCX: ffff888000300000
RDX: 0000000000000000 RSI: 00000000fffffffe RDI: ffffffff903c3be0
RBP: ffffc90000b5f410 R08: ffff888000300000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880472f5be8 R14: 0000000000000000 R15: ffff8880366d8001
FS:  0000000000000000(0000) GS:ffff88808c826000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe6f0b51c80 CR3: 0000000037dfb000 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+0x1870/0x4710 fs/btrfs/extent-tree.c:2133
 btrfs_run_delayed_refs+0xe6/0x3b0 fs/btrfs/extent-tree.c:2245
 flush_space+0x574/0xe20 fs/btrfs/space-info.c:-1
 do_async_reclaim_metadata_space+0x3fc/0x960 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:3302 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466
 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>
----------------
Code disassembly (best guess):
   0:	e9 c8 05 00 00       	jmp    0x5cd
   5:	e8 10 86 c2 fd       	call   0xfdc2861a
   a:	84 c0                	test   %al,%al
   c:	0f 84 f2 00 00 00    	je     0x104
  12:	e8 03 6a dd fd       	call   0xfddd6a1a
  17:	e9 b1 05 00 00       	jmp    0x5cd
  1c:	e8 f9 69 dd fd       	call   0xfddd6a1a
  21:	48 8d 3d 12 82 54 0c 	lea    0xc548212(%rip),%rdi        # 0xc54823a
  28:	89 de                	mov    %ebx,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 c1 e0 ff ff       	jmp    0xffffe0f5
  34:	e8 e1 69 dd fd       	call   0xfddd6a1a
  39:	eb 05                	jmp    0x40
  3b:	e8 da 69 dd fd       	call   0xfddd6a1a