------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/block-group.c:4012 at do_chunk_alloc fs/btrfs/block-group.c:4012 [inline], CPU#0: kworker/u4:1/13
WARNING: fs/btrfs/block-group.c:4012 at btrfs_chunk_alloc+0x101d/0x15d0 fs/btrfs/block-group.c:4253, CPU#0: kworker/u4:1/13
Modules linked in:
CPU: 0 UID: 0 PID: 13 Comm: kworker/u4:1 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_chunk_alloc fs/btrfs/block-group.c:4012 [inline]
RIP: 0010:btrfs_chunk_alloc+0x101f/0x15d0 fs/btrfs/block-group.c:4253
Code: 67 1b bd fd e9 6d 01 00 00 e8 3d 3c a2 fd 84 c0 74 22 e8 54 1b bd fd e9 5a 01 00 00 e8 4a 1b bd fd 48 8d 3d 23 58 f1 0b 89 de <67> 48 0f b9 3a e9 b3 fc ff ff e8 02 b6 91 07 41 89 c6 31 ff 89 c6
RSP: 0018:ffffc900001f7670 EFLAGS: 00010293
RAX: ffffffff84076e76 RBX: ffffffffffffffe4 RCX: ffff88801c690000
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffffffff8ff8c6a0
RBP: 0000000000000000 R08: ffff88801c690000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: 1ffff11003fad816
R13: ffff888012bdb9a0 R14: ffff88803e474001 R15: ffff88801fc78000
FS:  0000000000000000(0000) GS:ffff88808cce8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f7c8ea65f8 CR3: 000000001fd7f000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 flush_space+0x353/0xd30 fs/btrfs/space-info.c:898
 do_async_reclaim_metadata_space+0x3fc/0x960 fs/btrfs/space-info.c:1189
 btrfs_async_reclaim_metadata_space+0x89/0xe0 fs/btrfs/space-info.c:1256
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421
 kthread+0x726/0x8b0 kernel/kthread.c:463
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
----------------
Code disassembly (best guess):
   0:	67 1b bd fd e9 6d 01 	sbb    0x16de9fd(%ebp),%edi
   7:	00 00                	add    %al,(%rax)
   9:	e8 3d 3c a2 fd       	call   0xfda23c4b
   e:	84 c0                	test   %al,%al
  10:	74 22                	je     0x34
  12:	e8 54 1b bd fd       	call   0xfdbd1b6b
  17:	e9 5a 01 00 00       	jmp    0x176
  1c:	e8 4a 1b bd fd       	call   0xfdbd1b6b
  21:	48 8d 3d 23 58 f1 0b 	lea    0xbf15823(%rip),%rdi        # 0xbf1584b
  28:	89 de                	mov    %ebx,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 b3 fc ff ff       	jmp    0xfffffce7
  34:	e8 02 b6 91 07       	call   0x791b63b
  39:	41 89 c6             	mov    %eax,%r14d
  3c:	31 ff                	xor    %edi,%edi
  3e:	89 c6                	mov    %eax,%esi