loop0: detected capacity change from 0 to 32768
BTRFS: device fsid 395ef67a-297e-477c-816d-cd80a5b93e5d devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5326)
BTRFS info (device loop0): first mount of filesystem 395ef67a-297e-477c-816d-cd80a5b93e5d
BTRFS info (device loop0): using sha256 checksum algorithm
BTRFS info (device loop0): allowing degraded mounts
BTRFS info (device loop0): enabling ssd optimizations
BTRFS info (device loop0): disabling tree log
BTRFS info (device loop0): turning on sync discard
BTRFS info (device loop0): enabling free space tree
BTRFS info (device loop0): balance: start -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.0.0/5326
Modules linked in:
CPU: 0 UID: 0 PID: 5326 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 f8 7e 85 fd eb 65 e8 f1 7e 85 fd eb 1a e8 ea 7e 85 fd 49 be 00 00 00 00 00 fc ff df eb 09 e8 d9 7e 85 fd 90 <0f> 0b 90 f7 db e9 47 fd ff ff e8 c9 7e 85 fd eb 10 e8 c2 7e 85 fd
RSP: 0018:ffffc9000e23f720 EFLAGS: 00010287
RAX: ffffffff84428047 RBX: 00000000ffffffe4 RCX: 0000000000100000
RDX: ffffc9000f4d1000 RSI: 0000000000008b55 RDI: 0000000000008b56
RBP: ffffc9000e23f9a0 R08: ffff888034222580 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000002 R12: ffff88805261e150
R13: fffff52001c47f00 R14: dffffc0000000000 R15: ffff88805261e318
FS:  00007fcd6c4f66c0(0000) GS:ffff88808c2bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f873a18b000 CR3: 00000000131f0000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __btrfs_end_transaction+0x140/0x640 fs/btrfs/transaction.c:1101
 btrfs_inc_block_group_ro+0x64b/0x7d0 fs/btrfs/block-group.c:3249
 btrfs_relocate_block_group+0x285/0xaf0 fs/btrfs/relocation.c:5501
 btrfs_relocate_chunk+0x114/0x810 fs/btrfs/volumes.c:3729
 __btrfs_balance+0x1b5f/0x29d0 fs/btrfs/volumes.c:4668
 btrfs_balance+0xaa6/0x1180 fs/btrfs/volumes.c:5055
 btrfs_ioctl_balance+0x3da/0x640 fs/btrfs/ioctl.c:3494
 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: 0033:0x7fcd6b59e159
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:00007fcd6c4f5fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fcd6b825fa0 RCX: 00007fcd6b59e159
RDX: 0000200000000300 RSI: 00000000c4009420 RDI: 0000000000000004
RBP: 00007fcd6b63506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcd6b826038 R14: 00007fcd6b825fa0 R15: 00007ffcf6bcf518
 </TASK>