BTRFS info (device loop0): balance: start -d -m
BTRFS info (device loop0): unable to make block group 8519680 ro
BTRFS info (device loop0): space_info DATA+METADATA has 3018752 free, is not full
BTRFS info (device loop0): space_info total=11534336, used=1560576, pinned=0, reserved=0, may_use=6955008, readonly=0 zone_unusable=0
BTRFS info (device loop0): global_block_rsv: size 1441792 reserved 1441792
BTRFS info (device loop0): trans_block_rsv: size 0 reserved 0
BTRFS info (device loop0): chunk_block_rsv: size 0 reserved 0
BTRFS info (device loop0): delayed_block_rsv: size 32768 reserved 32768
BTRFS info (device loop0): delayed_refs_rsv: size 0 reserved 0
BTRFS info (device loop0): relocating block group 6881280 flags data|metadata
BTRFS error (device loop0): allocation failed flags 2, wanted 4096 tree-log 0, relocation: 0
BTRFS info (device loop0): space_info SYSTEM has -98304 free, is not full
BTRFS info (device loop0): space_info total=4194304, used=4096, pinned=0, reserved=0, may_use=98304, readonly=4190208 zone_unusable=0
BTRFS info (device loop0): global_block_rsv: size 1441792 reserved 1429504
BTRFS info (device loop0): trans_block_rsv: size 262144 reserved 262144
BTRFS info (device loop0): chunk_block_rsv: size 98304 reserved 94208
BTRFS info (device loop0): delayed_block_rsv: size 32768 reserved 32768
BTRFS info (device loop0): delayed_refs_rsv: size 2359296 reserved 753664
BTRFS info (device loop0): block group 1048576 has 4194304 bytes, 4096 used 0 pinned 0 reserved 0 delalloc 0 super 0 zone_unusable (4190208 bytes available) [readonly]
BTRFS critical (device loop0): entry offset 1048576, bytes 8192, bitmap no
BTRFS critical (device loop0): entry offset 1060864, bytes 4182016, bitmap no
BTRFS info (device loop0): block group has cluster?: no
BTRFS info (device loop0): 0 free space entries at or bigger than 4096 bytes
BTRFS info (device loop0): 4190208 bytes available across all block groups
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 0 PID: 5323 at fs/btrfs/volumes.c:3426 btrfs_remove_chunk+0x19ce/0x1cb0 fs/btrfs/volumes.c:3426
Modules linked in:
CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted 6.14.0-syzkaller-12245-g91e5bfe317d8 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:btrfs_remove_chunk+0x19ce/0x1cb0 fs/btrfs/volumes.c:3426
Code: 48 8b 38 48 c7 c6 c0 b9 8d 8c 44 89 e2 e8 ca af 29 fd eb 1a e8 03 3d c5 fd 90 48 c7 c7 60 b9 8d 8c 44 89 e6 e8 83 5d 84 fd 90 <0f> 0b 90 90 49 bf 00 00 00 00 00 fc ff df 4c 8b 6c 24 10 e9 7e f9
RSP: 0018:ffffc9000d1178e0 EFLAGS: 00010246
RAX: 086489340eee4000 RBX: ffff88801253c001 RCX: 0000000000100000
RDX: ffffc9000eaeb000 RSI: 000000000003526a RDI: 000000000003526b
RBP: ffffc9000d117ad0 R08: ffffffff81827a12 R09: fffffbfff1d7a978
R10: dffffc0000000000 R11: fffffbfff1d7a978 R12: ffffffffffffffe4
R13: ffff888033371200 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f05fee736c0(0000) GS:ffff88808c59c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000de000 CR3: 00000000532b6000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_relocate_chunk+0x292/0x3b0 fs/btrfs/volumes.c:3556
 __btrfs_balance+0x1a93/0x25e0 fs/btrfs/volumes.c:4292
 btrfs_balance+0xbde/0x10c0 fs/btrfs/volumes.c:4669
 btrfs_ioctl_balance+0x3f5/0x660 fs/btrfs/ioctl.c:3586
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f05fdf8d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f05fee73038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f05fe1a6080 RCX: 00007f05fdf8d169
RDX: 0000200000000180 RSI: 00000000c4009420 RDI: 000000000000000a
RBP: 00007f05fe00e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f05fe1a6080 R15: 00007fff0a1eabf8
 </TASK>