loop0: detected capacity change from 0 to 32768
BTRFS: device fsid c9fe44da-de57-406a-8241-57ec7d4412cf devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5313)
BTRFS info (device loop0): first mount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf
BTRFS info (device loop0): using crc32c 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 -f -s
------------[ cut here ]------------
btrfs_abort_should_print_stack(__error)
WARNING: fs/btrfs/block-group.c:2944 at btrfs_create_pending_block_groups+0x13d8/0x15e0 fs/btrfs/block-group.c:2944, CPU#0: syz.0.0/5313
Modules linked in:
CPU: 0 UID: 0 PID: 5313 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+0x13d8/0x15e0 fs/btrfs/block-group.c:2944
Code: 83 fb f4 75 63 e8 e8 18 89 fd eb 65 e8 e1 18 89 fd eb 1a e8 da 18 89 fd 49 be 00 00 00 00 00 fc ff df eb 09 e8 c9 18 89 fd 90 <0f> 0b 90 f7 db e9 47 fd ff ff e8 b9 18 89 fd eb 10 e8 b2 18 89 fd
RSP: 0018:ffffc9000e857720 EFLAGS: 00010287
RAX: ffffffff843e1bf7 RBX: 00000000ffffffe4 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 0000000000008ba8 RDI: 0000000000008ba9
RBP: ffffc9000e8579a0 R08: ffff88803efd4b00 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000002 R12: ffff888051d96150
R13: fffff52001d0af00 R14: dffffc0000000000 R15: ffff888051d96318
FS:  00007f34191376c0(0000) GS:ffff88808c30a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f90b717e263 CR3: 0000000012825000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __btrfs_end_transaction+0x140/0x640 fs/btrfs/transaction.c:1090
 btrfs_inc_block_group_ro+0x64b/0x7d0 fs/btrfs/block-group.c:3245
 btrfs_relocate_block_group+0x285/0xaf0 fs/btrfs/relocation.c:5501
 btrfs_relocate_chunk+0x114/0x810 fs/btrfs/volumes.c:3694
 __btrfs_balance+0x1b5f/0x29d0 fs/btrfs/volumes.c:4633
 btrfs_balance+0xaa6/0x1180 fs/btrfs/volumes.c:5020
 btrfs_ioctl_balance+0x3da/0x640 fs/btrfs/ioctl.c:3479
 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:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f341819e0d9
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:00007f3419136fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3418425fa0 RCX: 00007f341819e0d9
RDX: 0000200000000300 RSI: 00000000c4009420 RDI: 0000000000000006
RBP: 00007f3418235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3418426038 R14: 00007f3418425fa0 R15: 00007fff61391bb8
 </TASK>