BTRFS info (device loop0): scrub: started on devid 1
BTRFS info (device loop0): unable to make block group 5242880 ro
BTRFS info (device loop0): space_info DATA+METADATA (sub-group id 0) has 671744 free, is not full
BTRFS info (device loop0): space_info total=3276800, used=647168, pinned=24576, reserved=131072, may_use=1802240, 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 294912 reserved 163840
BTRFS error (device loop0): allocation failed flags 10, wanted 4096 tree-log 0, relocation: 0
BTRFS info (device loop0): space_info SYSTEM (sub-group id 0) has 4091904 free, is not full
BTRFS info (device loop0): space_info total=4194304, used=4096, pinned=0, reserved=0, may_use=98304, 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 98304 reserved 94208
BTRFS info (device loop0): delayed_block_rsv: size 32768 reserved 32768
BTRFS info (device loop0): delayed_refs_rsv: size 360448 reserved 163840
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) 
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: 5359 at fs/btrfs/block-group.c:4000 do_chunk_alloc fs/btrfs/block-group.c:4000 [inline]
WARNING: CPU: 0 PID: 5359 at fs/btrfs/block-group.c:4000 btrfs_chunk_alloc+0xf9d/0x1460 fs/btrfs/block-group.c:4241
Modules linked in:
CPU: 0 UID: 0 PID: 5359 Comm: syz.0.0 Not tainted 6.17.0-rc1-syzkaller #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:do_chunk_alloc fs/btrfs/block-group.c:4000 [inline]
RIP: 0010:btrfs_chunk_alloc+0xf9d/0x1460 fs/btrfs/block-group.c:4241
Code: b9 fd 84 c0 0f 84 63 01 00 00 e8 3e 6b d2 fd e9 8c 03 00 00 e8 34 6b d2 fd 90 48 c7 c7 a0 04 d0 8b 44 89 f6 e8 f4 f9 95 fd 90 <0f> 0b 90 90 e9 3e fc ff ff e8 15 6b d2 fd eb 05 e8 0e 6b d2 fd e8
RSP: 0018:ffffc9000d357980 EFLAGS: 00010246
RAX: d4e32d91cf123100 RBX: ffff88805329c001 RCX: 0000000000100000
RDX: ffffc9000ef04000 RSI: 000000000001e2cc RDI: 000000000001e2cd
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa1ec R12: dffffc0000000000
R13: ffff88805234b000 R14: ffffffffffffffe4 R15: ffff88804378da68
FS:  00007f6dc0df66c0(0000) GS:ffff88808d211000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6dc0db3fc8 CR3: 000000003f8a7000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 btrfs_inc_block_group_ro+0x415/0x6f0 fs/btrfs/block-group.c:3061
 scrub_enumerate_chunks+0x7ee/0x13c0 fs/btrfs/scrub.c:2760
 btrfs_scrub_dev+0x7bd/0x10c0 fs/btrfs/scrub.c:3138
 btrfs_ioctl_scrub+0x232/0x490 fs/btrfs/ioctl.c:3163
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6dbff8ebe9
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:00007f6dc0df6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6dc01b6180 RCX: 00007f6dbff8ebe9
RDX: 0000200000000000 RSI: 00000000c400941b RDI: 000000000000000e
RBP: 00007f6dc0011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6dc01b6218 R14: 00007f6dc01b6180 R15: 00007ffc130d2e58
 </TASK>