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 (5328)
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
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/block-group.c:2925 at btrfs_create_pending_block_groups+0x1616/0x1b40 fs/btrfs/block-group.c:2925, CPU#0: syz.0.0/5328
Modules linked in:
CPU: 0 UID: 0 PID: 5328 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+0x1618/0x1b40 fs/btrfs/block-group.c:2925
Code: 9e a4 af fd e9 a6 03 00 00 e8 74 b9 94 fd 84 c0 74 27 e8 8b a4 af fd e9 93 03 00 00 e8 81 a4 af fd 48 8d 3d 7a e3 26 0c 89 de <67> 48 0f b9 3a 4c 8b 6c 24 20 e9 22 fc ff ff e8 44 00 a2 07 41 89
RSP: 0018:ffffc9000e387700 EFLAGS: 00010283
RAX: ffffffff84163a2f RBX: 00000000ffffffe4 RCX: 0000000000100000
RDX: ffffc9000ec3a000 RSI: 00000000ffffffe4 RDI: ffffffff903d1db0
RBP: ffffc9000e387970 R08: ffff888036b48000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000002 R12: dffffc0000000000
R13: fffff52001c70efc R14: 0000000000000000 R15: ffff888042368001
FS:  00007f7570bc36c0(0000) GS:ffff88808c81a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7570b80fe8 CR3: 00000000121c3000 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:5359
 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: 0033:0x7f756fd9c819
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:00007f7570bc2fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7570015fa0 RCX: 00007f756fd9c819
RDX: 0000200000000200 RSI: 00000000c4009420 RDI: 0000000000000006
RBP: 00007f756fe32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7570016038 R14: 00007f7570015fa0 R15: 00007ffcb20299c8
 </TASK>
----------------
Code disassembly (best guess):
   0:	9e                   	sahf
   1:	a4                   	movsb  %ds:(%rsi),%es:(%rdi)
   2:	af                   	scas   %es:(%rdi),%eax
   3:	fd                   	std
   4:	e9 a6 03 00 00       	jmp    0x3af
   9:	e8 74 b9 94 fd       	call   0xfd94b982
   e:	84 c0                	test   %al,%al
  10:	74 27                	je     0x39
  12:	e8 8b a4 af fd       	call   0xfdafa4a2
  17:	e9 93 03 00 00       	jmp    0x3af
  1c:	e8 81 a4 af fd       	call   0xfdafa4a2
  21:	48 8d 3d 7a e3 26 0c 	lea    0xc26e37a(%rip),%rdi        # 0xc26e3a2
  28:	89 de                	mov    %ebx,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	4c 8b 6c 24 20       	mov    0x20(%rsp),%r13
  34:	e9 22 fc ff ff       	jmp    0xfffffc5b
  39:	e8 44 00 a2 07       	call   0x7a20082
  3e:	41                   	rex.B
  3f:	89                   	.byte 0x89