------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/block-group.c:4175 at do_chunk_alloc fs/btrfs/block-group.c:4175 [inline], CPU#0: kworker/u4:2/30
WARNING: fs/btrfs/block-group.c:4175 at btrfs_chunk_alloc+0x1079/0x1660 fs/btrfs/block-group.c:4416, CPU#0: kworker/u4:2/30
Modules linked in:
CPU: 0 UID: 0 PID: 30 Comm: kworker/u4:2 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_data_space
RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:4175 [inline]
RIP: 0010:btrfs_chunk_alloc+0x107c/0x1660 fs/btrfs/block-group.c:4416
Code: 58 ae fd e9 80 01 00 00 e8 31 6b 93 fd 84 c0 74 23 e8 48 58 ae fd e9 6d 01 00 00 e8 3e 58 ae fd 48 8d 3d d7 7b 22 0c 44 89 f6 <67> 48 0f b9 3a e9 97 fc ff ff e8 75 51 8d 07 89 c3 31 ff 89 c6 e8
RSP: 0018:ffffc900003877d0 EFLAGS: 00010293
RAX: ffffffff8416f8f2 RBX: ffff888046fd5a70 RCX: ffff88801f14a540
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffffffff903974d0
RBP: 0000000000000000 R08: ffff88801f14a540 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: 1ffff110024c1216
R13: ffff888041c40001 R14: ffffffffffffffe4 R15: ffff888040af8800
FS:  0000000000000000(0000) GS:ffff88808c8ae000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f97b3773350 CR3: 000000001327c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 flush_space+0x3df/0xde0 fs/btrfs/space-info.c:908
 do_async_reclaim_data_space+0x137/0x550 fs/btrfs/space-info.c:1448
 btrfs_async_reclaim_data_space+0x41/0x90 fs/btrfs/space-info.c:1512
 process_one_work kernel/workqueue.c:3314 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478
 kthread+0x389/0x470 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:	58                   	pop    %rax
   1:	ae                   	scas   %es:(%rdi),%al
   2:	fd                   	std
   3:	e9 80 01 00 00       	jmp    0x188
   8:	e8 31 6b 93 fd       	call   0xfd936b3e
   d:	84 c0                	test   %al,%al
   f:	74 23                	je     0x34
  11:	e8 48 58 ae fd       	call   0xfdae585e
  16:	e9 6d 01 00 00       	jmp    0x188
  1b:	e8 3e 58 ae fd       	call   0xfdae585e
  20:	48 8d 3d d7 7b 22 0c 	lea    0xc227bd7(%rip),%rdi        # 0xc227bfe
  27:	44 89 f6             	mov    %r14d,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 97 fc ff ff       	jmp    0xfffffccb
  34:	e8 75 51 8d 07       	call   0x78d51ae
  39:	89 c3                	mov    %eax,%ebx
  3b:	31 ff                	xor    %edi,%edi
  3d:	89 c6                	mov    %eax,%esi
  3f:	e8                   	.byte 0xe8