loop0: detected capacity change from 0 to 32768
BTRFS: device fsid 5e4b7888-5e56-43f0-8345-635ad0fd87c6 devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5333)
BTRFS info (device loop0): first mount of filesystem 5e4b7888-5e56-43f0-8345-635ad0fd87c6
BTRFS info (device loop0): using blake2b checksum algorithm
BTRFS info (device loop0): enabling ssd optimizations
BTRFS info (device loop0): turning on async discard
BTRFS info (device loop0): enabling free space tree
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:3477 at btrfs_remove_chunk+0xe12/0x15b0 fs/btrfs/volumes.c:3477, 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_remove_chunk+0xe19/0x15b0 fs/btrfs/volumes.c:3477
Code: fe 00 00 00 e8 d8 ec b1 fd 84 c0 74 27 e8 cf d0 cc fd e9 eb 00 00 00 e8 c5 d0 cc fd 48 8d 3d de 2d 44 0c 48 8b 5c 24 18 89 de <67> 48 0f b9 3a e9 12 01 00 00 e8 88 a7 bd 07 89 c3 31 ff 89 c6 e8
RSP: 0018:ffffc9000ef07940 EFLAGS: 00010287
RAX: ffffffff83f852fb RBX: ffffffffffffffe4 RCX: 0000000000100000
RDX: ffffc9000f689000 RSI: 00000000ffffffe4 RDI: ffffffff903c80e0
RBP: ffffc9000ef07a90 R08: ffff888037e52500 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000002 R12: ffff888042bb1700
R13: ffff888047ac97e0 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f75ee00e6c0(0000) GS:ffff88808c826000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f75edfcbfe8 CR3: 00000000427b1000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 btrfs_relocate_chunk_finish fs/btrfs/volumes.c:3565 [inline]
 btrfs_relocate_chunk+0x3ed/0x820 fs/btrfs/volumes.c:3619
 __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: 0033:0x7f75ed19c819
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:00007f75ee00dfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f75ed415fa0 RCX: 00007f75ed19c819
RDX: 0000200000000200 RSI: 00000000c4009420 RDI: 0000000000000006
RBP: 00007f75ed232c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f75ed416038 R14: 00007f75ed415fa0 R15: 00007fff3fb5feb8
 </TASK>
----------------
Code disassembly (best guess):
   0:	fe 00                	incb   (%rax)
   2:	00 00                	add    %al,(%rax)
   4:	e8 d8 ec b1 fd       	call   0xfdb1ece1
   9:	84 c0                	test   %al,%al
   b:	74 27                	je     0x34
   d:	e8 cf d0 cc fd       	call   0xfdccd0e1
  12:	e9 eb 00 00 00       	jmp    0x102
  17:	e8 c5 d0 cc fd       	call   0xfdccd0e1
  1c:	48 8d 3d de 2d 44 0c 	lea    0xc442dde(%rip),%rdi        # 0xc442e01
  23:	48 8b 5c 24 18       	mov    0x18(%rsp),%rbx
  28:	89 de                	mov    %ebx,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 12 01 00 00       	jmp    0x146
  34:	e8 88 a7 bd 07       	call   0x7bda7c1
  39:	89 c3                	mov    %eax,%ebx
  3b:	31 ff                	xor    %edi,%edi
  3d:	89 c6                	mov    %eax,%esi
  3f:	e8                   	.byte 0xe8