BTRFS info (device loop0): balance: start -s
BTRFS info (device loop0): relocating block group 1048576 flags system
------------[ 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#0: syz.0.0/5348
Modules linked in:
CPU: 0 UID: 0 PID: 5348 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_remove_chunk+0xe10/0x15f0 fs/btrfs/volumes.c:3470
Code: b4 cd fd e9 ee 00 00 00 e8 7d b7 b2 fd 84 c0 74 23 e8 84 b4 cd fd e9 db 00 00 00 e8 7a b4 cd fd 48 8d 3d b3 3e 23 0c 44 89 ee <67> 48 0f b9 3a e9 02 01 00 00 e8 d1 2d b9 07 89 c3 31 ff 89 c6 e8
RSP: 0018:ffffc90003e17940 EFLAGS: 00010293
RAX: ffffffff83f80a16 RBX: ffff888041eac001 RCX: ffff888000fba4c0
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffffffff901b48d0
RBP: ffffc90003e17a90 R08: ffff888000fba4c0 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: ffff8880474b8128
R13: ffffffffffffffe4 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007fcbe7f8a6c0(0000) GS:ffff88808ca4c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcbe7f89fe8 CR3: 00000000122e4000 CR4: 0000000000352ef0
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:4501
 btrfs_balance+0xafa/0x11f0 fs/btrfs/volumes.c:4888
 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: 0033:0x7fcbe719c819
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:00007fcbe7f89fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fcbe7416180 RCX: 00007fcbe719c819
RDX: 0000200000000200 RSI: 00000000c4009420 RDI: 0000000000000007
RBP: 00007fcbe7232c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcbe7416218 R14: 00007fcbe7416180 R15: 00007ffc6eeb4578
 </TASK>
----------------
Code disassembly (best guess):
   0:	b4 cd                	mov    $0xcd,%ah
   2:	fd                   	std
   3:	e9 ee 00 00 00       	jmp    0xf6
   8:	e8 7d b7 b2 fd       	call   0xfdb2b78a
   d:	84 c0                	test   %al,%al
   f:	74 23                	je     0x34
  11:	e8 84 b4 cd fd       	call   0xfdcdb49a
  16:	e9 db 00 00 00       	jmp    0xf6
  1b:	e8 7a b4 cd fd       	call   0xfdcdb49a
  20:	48 8d 3d b3 3e 23 0c 	lea    0xc233eb3(%rip),%rdi        # 0xc233eda
  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 d1 2d b9 07       	call   0x7b92e0a
  39:	89 c3                	mov    %eax,%ebx
  3b:	31 ff                	xor    %edi,%edi
  3d:	89 c6                	mov    %eax,%esi
  3f:	e8                   	.byte 0xe8