------------[ 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/u4:17/2960
WARNING: fs/btrfs/block-group.c:4012 at btrfs_chunk_alloc+0x101d/0x15d0 fs/btrfs/block-group.c:4253, CPU#0: kworker/u4:17/2960
Modules linked in:
CPU: 0 UID: 0 PID: 2960 Comm: kworker/u4:17 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: b7 de c1 fd e9 6d 01 00 00 e8 0d 8d a7 fd 84 c0 74 22 e8 a4 de c1 fd e9 5a 01 00 00 e8 9a de c1 fd 48 8d 3d 33 85 d7 0b 89 de <67> 48 0f b9 3a e9 b3 fc ff ff e8 b2 da 79 07 41 89 c6 31 ff 89 c6
RSP: 0018:ffffc900032ef730 EFLAGS: 00010293
RAX: ffffffff8400c9c6 RBX: ffffffffffffffe4 RCX: ffff888040e10000
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffffffff8fd84f00
RBP: 0000000000000000 R08: ffff888040e10000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: 1ffff1100836e816
R13: ffff888012013060 R14: ffff888041c64001 R15: ffff888041f12800
FS:  0000000000000000(0000) GS:ffff88808cf1d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005607293c0168 CR3: 000000003669a000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 flush_space+0x353/0xd30 fs/btrfs/space-info.c:898
 do_async_reclaim_metadata_space+0x11e/0x350 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+0x89f/0xd90 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:	b7 de                	mov    $0xde,%bh
   2:	c1 fd e9             	sar    $0xe9,%ebp
   5:	6d                   	insl   (%dx),%es:(%rdi)
   6:	01 00                	add    %eax,(%rax)
   8:	00 e8                	add    %ch,%al
   a:	0d 8d a7 fd 84       	or     $0x84fda78d,%eax
   f:	c0 74 22 e8 a4       	shlb   $0xa4,-0x18(%rdx,%riz,1)
  14:	de c1                	faddp  %st,%st(1)
  16:	fd                   	std
  17:	e9 5a 01 00 00       	jmp    0x176
  1c:	e8 9a de c1 fd       	call   0xfdc1debb
  21:	48 8d 3d 33 85 d7 0b 	lea    0xbd78533(%rip),%rdi        # 0xbd7855b
  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 b2 da 79 07       	call   0x779daeb
  39:	41 89 c6             	mov    %eax,%r14d
  3c:	31 ff                	xor    %edi,%edi
  3e:	89 c6                	mov    %eax,%esi