BTRFS info (device loop1): relocating block group 1048576 flags system
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/volumes.c:3470 at btrfs_remove_chunk+0x1333/0x1500 fs/btrfs/volumes.c:3470, CPU#0: syz-executor.1/6231
Modules linked in:
CPU: 0 UID: 0 PID: 6231 Comm: syz-executor.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
RIP: 0010:btrfs_remove_chunk+0x1335/0x1500 fs/btrfs/volumes.c:3470
Code: 53 03 00 00 48 c7 c7 e0 b6 05 8c c6 05 4e e1 83 0c 01 e8 ae 9f a6 fd e9 3c 3a f2 fc e8 64 ca ca fd 48 8d 3d 7d a7 a4 0c 89 ee <67> 48 0f b9 3a 41 bc 01 00 00 00 e8 4b ca ca fd 48 8b 3c 24 45 89
RSP: 0018:ffffc90004b8f7d0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802ab1af00 RCX: ffffffff843de8ab
RDX: ffff88802552c980 RSI: 00000000ffffffe4 RDI: ffffffff90e29280
RBP: 00000000ffffffe4 R08: 0000000000000005 R09: fffffffffffffffb
R10: ffffffffffffffe4 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffffffffffe4 R14: ffff888013ba474c R15: ffff88804d4e5c00
FS:  00007f6dd60176c0(0000) GS:ffff8880d6345000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555f14ab06f8 CR3: 000000002e635000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 btrfs_relocate_chunk_finish fs/btrfs/volumes.c:3557 [inline]
 btrfs_relocate_chunk+0x463/0x700 fs/btrfs/volumes.c:3611
 __btrfs_balance fs/btrfs/volumes.c:4492 [inline]
 btrfs_balance+0x247e/0x50b0 fs/btrfs/volumes.c:4879
 btrfs_ioctl_balance fs/btrfs/ioctl.c:3445 [inline]
 btrfs_ioctl+0x3ebb/0x64e0 fs/btrfs/ioctl.c:5201
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6dd526e3f9
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 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6dd6017078 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6dd53abf80 RCX: 00007f6dd526e3f9
RDX: 0000000020000480 RSI: 00000000c4009420 RDI: 0000000000000004
RBP: 00007f6dd52cf498 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f6dd53abf80 R15: 00007ffce962e358
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	00 00                	add    %al,(%rax)
   2:	48 c7 c7 e0 b6 05 8c 	mov    $0xffffffff8c05b6e0,%rdi
   9:	c6 05 4e e1 83 0c 01 	movb   $0x1,0xc83e14e(%rip)        # 0xc83e15e
  10:	e8 ae 9f a6 fd       	call   0xfda69fc3
  15:	e9 3c 3a f2 fc       	jmp    0xfcf23a56
  1a:	e8 64 ca ca fd       	call   0xfdcaca83
  1f:	48 8d 3d 7d a7 a4 0c 	lea    0xca4a77d(%rip),%rdi        # 0xca4a7a3
  26:	89 ee                	mov    %ebp,%esi
* 28:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2d:	41 bc 01 00 00 00    	mov    $0x1,%r12d
  33:	e8 4b ca ca fd       	call   0xfdcaca83
  38:	48 8b 3c 24          	mov    (%rsp),%rdi
  3c:	45                   	rex.RB
  3d:	89                   	.byte 0x89