------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/volumes.c:3470 at btrfs_remove_chunk+0xe0d/0x15f0 fs/btrfs/volumes.c:3470, CPU#1: syz.1.27/6140
Modules linked in:
CPU: 1 UID: 0 PID: 6140 Comm: syz.1.27 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:btrfs_remove_chunk+0xe10/0x15f0 fs/btrfs/volumes.c:3470
Code: 95 cf fd e9 ee 00 00 00 e8 ed a8 b4 fd 84 c0 74 23 e8 84 95 cf fd e9 db 00 00 00 e8 7a 95 cf fd 48 8d 3d 13 e2 24 0c 44 89 ee <67> 48 0f b9 3a e9 02 01 00 00 e8 81 3c b8 07 89 c3 31 ff 89 c6 e8
RSP: 0018:ffffc900058b7940 EFLAGS: 00010293
RAX: ffffffff83f60b66 RBX: ffff88811ae7c001 RCX: ffff88810ec357c0
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffffffff901aed80
RBP: ffffc900058b7a90 R08: ffff88810ec357c0 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: ffff8881bbc4fa68
R13: ffffffffffffffe4 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f9f3a0ab6c0(0000) GS:ffff8882a9460000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9f3a089ff8 CR3: 0000000172488000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 btrfs_relocate_chunk_finish fs/btrfs/volumes.c:3557 [inline]
 btrfs_relocate_chunk+0x3ed/0x820 fs/btrfs/volumes.c:3611
 __btrfs_balance+0x1db0/0x2ae0 fs/btrfs/volumes.c:4492
 btrfs_balance+0xafa/0x11f0 fs/btrfs/volumes.c:4879
 btrfs_ioctl_balance+0x3d3/0x610 fs/btrfs/ioctl.c:3452
 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9f3919c799
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:00007f9f3a0ab028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9f39415fa0 RCX: 00007f9f3919c799
RDX: 0000200000000780 RSI: 00000000c4009420 RDI: 0000000000000004
RBP: 00007f9f39232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9f39416038 R14: 00007f9f39415fa0 R15: 00007fff97c88378
 </TASK>
----------------
Code disassembly (best guess):
   0:	95                   	xchg   %eax,%ebp
   1:	cf                   	iret
   2:	fd                   	std
   3:	e9 ee 00 00 00       	jmp    0xf6
   8:	e8 ed a8 b4 fd       	call   0xfdb4a8fa
   d:	84 c0                	test   %al,%al
   f:	74 23                	je     0x34
  11:	e8 84 95 cf fd       	call   0xfdcf959a
  16:	e9 db 00 00 00       	jmp    0xf6
  1b:	e8 7a 95 cf fd       	call   0xfdcf959a
  20:	48 8d 3d 13 e2 24 0c 	lea    0xc24e213(%rip),%rdi        # 0xc24e23a
  27:	44 89 ee             	mov    %r13d,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 02 01 00 00       	jmp    0x136
  34:	e8 81 3c b8 07       	call   0x7b83cba
  39:	89 c3                	mov    %eax,%ebx
  3b:	31 ff                	xor    %edi,%edi
  3d:	89 c6                	mov    %eax,%esi
  3f:	e8                   	.byte 0xe8
