BTRFS info (device loop0): balance: start -s
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/block-group.c:2918 at btrfs_create_pending_block_groups+0x14ae/0x1b40 fs/btrfs/block-group.c:2918, CPU#0: syz.0.0/5333
Modules linked in:
CPU: 0 UID: 0 PID: 5333 Comm: syz.0.0 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
RIP: 0010:btrfs_create_pending_block_groups+0x14b0/0x1b40 fs/btrfs/block-group.c:2918
Code: 06 6e ae fd e9 fc 01 00 00 e8 bc 79 93 fd 84 c0 74 22 e8 f3 6d ae fd e9 e9 01 00 00 e8 e9 6d ae fd 48 8d 3d 42 2e 23 0c 89 de <67> 48 0f b9 3a e9 bc fc ff ff e8 b1 dd 92 07 41 89 c4 31 ff 89 c6
RSP: 0018:ffffc900032df700 EFLAGS: 00010283
RAX: ffffffff84175cc7 RBX: 00000000ffffffe4 RCX: 0000000000100000
RDX: ffffc90021003000 RSI: 00000000ffffffe4 RDI: ffffffff903a8b10
RBP: ffffc900032df970 R08: ffff8880002f0000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000002 R12: dffffc0000000000
R13: fffff5200065befc R14: 0000000000000000 R15: ffff8880411a4001
FS:  00007f40767d46c0(0000) GS:ffff88808c885000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f40767d3ff8 CR3: 0000000042a3f000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __btrfs_end_transaction+0x140/0x650 fs/btrfs/transaction.c:1091
 btrfs_inc_block_group_ro+0x647/0x7c0 fs/btrfs/block-group.c:3219
 btrfs_relocate_block_group+0x3bb/0xc40 fs/btrfs/relocation.c:5377
 btrfs_relocate_chunk+0x115/0x820 fs/btrfs/volumes.c:3598
 __btrfs_balance+0x1db0/0x2ae0 fs/btrfs/volumes.c:4509
 btrfs_balance+0xaf3/0x11b0 fs/btrfs/volumes.c:4896
 btrfs_ioctl_balance+0x3d3/0x610 fs/btrfs/ioctl.c:3453
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f407a39cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f40767d3fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f407a616090 RCX: 00007f407a39cdd9
RDX: 0000200000000200 RSI: 00000000c4009420 RDI: 0000000000000006
RBP: 00007f407a432d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f407a616128 R14: 00007f407a616090 R15: 00007ffed24fbf18
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	6e                   	outsb  %ds:(%rsi),(%dx)
   1:	ae                   	scas   %es:(%rdi),%al
   2:	fd                   	std
   3:	e9 fc 01 00 00       	jmp    0x204
   8:	e8 bc 79 93 fd       	call   0xfd9379c9
   d:	84 c0                	test   %al,%al
   f:	74 22                	je     0x33
  11:	e8 f3 6d ae fd       	call   0xfdae6e09
  16:	e9 e9 01 00 00       	jmp    0x204
  1b:	e8 e9 6d ae fd       	call   0xfdae6e09
  20:	48 8d 3d 42 2e 23 0c 	lea    0xc232e42(%rip),%rdi        # 0xc232e69
  27:	89 de                	mov    %ebx,%esi
* 29:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2e:	e9 bc fc ff ff       	jmp    0xfffffcef
  33:	e8 b1 dd 92 07       	call   0x792dde9
  38:	41 89 c4             	mov    %eax,%r12d
  3b:	31 ff                	xor    %edi,%edi
  3d:	89 c6                	mov    %eax,%esi