BTRFS info (device loop0): scrub: started on devid 1
BTRFS info (device loop0): left=0, need=98304, flags=2
BTRFS info (device loop0): space_info SYSTEM (sub-group id 0) has 0 free, is not full
BTRFS info (device loop0): space_info total=4194304, used=4096, pinned=0, reserved=0, may_use=0, readonly=4190208 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): remap_block_rsv: size 0 reserved 0
BTRFS info (device loop0): delayed_block_rsv: size 0 reserved 0
BTRFS info (device loop0): delayed_refs_rsv: size 0 reserved 0
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 8253440 free, is not full
BTRFS info (device loop0): space_info total=12451840, used=4096, pinned=0, reserved=0, may_use=4096, readonly=4190208 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): remap_block_rsv: size 0 reserved 0
BTRFS info (device loop0): delayed_block_rsv: size 0 reserved 0
BTRFS info (device loop0): delayed_refs_rsv: size 65536 reserved 0
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 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): block group 8519680 has 8257536 bytes, 0 used 0 pinned 0 reserved 0 delalloc 0 super 0 zone_unusable (8257536 bytes available) 
BTRFS critical (device loop0): entry offset 8519680, bytes 8257536, bitmap no
BTRFS info (device loop0): block group has cluster?: no
BTRFS info (device loop0): 1 free space entries at or bigger than 4096 bytes
BTRFS info (device loop0): 12447744 bytes available across all block groups
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 8159232 free, is not full
BTRFS info (device loop0): space_info total=12451840, used=4096, pinned=0, reserved=0, may_use=98304, readonly=4190208 zone_unusable=0
BTRFS info (device loop0): global_block_rsv: size 1441792 reserved 1441792
BTRFS info (device loop0): trans_block_rsv: size 393216 reserved 393216
BTRFS info (device loop0): chunk_block_rsv: size 98304 reserved 94208
BTRFS info (device loop0): remap_block_rsv: size 0 reserved 0
BTRFS info (device loop0): delayed_block_rsv: size 0 reserved 0
BTRFS info (device loop0): delayed_refs_rsv: size 327680 reserved 0
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 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): block group 8519680 has 8257536 bytes, 0 used 0 pinned 0 reserved 0 delalloc 0 super 0 zone_unusable (8257536 bytes available) 
BTRFS critical (device loop0): entry offset 8519680, bytes 8257536, bitmap no
BTRFS info (device loop0): block group has cluster?: no
BTRFS info (device loop0): 1 free space entries at or bigger than 4096 bytes
BTRFS info (device loop0): 12447744 bytes available across all block groups
------------[ cut here ]------------
btrfs_abort_should_print_stack(__error)
WARNING: fs/btrfs/block-group.c:2951 at btrfs_create_pending_block_groups+0x141c/0x15e0 fs/btrfs/block-group.c:2951, CPU#0: syz.0.0/5317
Modules linked in:
CPU: 0 UID: 0 PID: 5317 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+0x141c/0x15e0 fs/btrfs/block-group.c:2951
Code: 8c 85 fd 90 0f 0b 90 48 8b 5c 24 18 44 89 e1 f7 d9 e9 47 fc ff ff e8 e3 8c 85 fd eb 10 e8 dc 8c 85 fd eb 09 e8 d5 8c 85 fd 90 <0f> 0b 90 f7 db 4c 8b 6c 24 40 4c 8b 7c 24 10 e9 be fd ff ff 44 89
RSP: 0018:ffffc9000f42f7a0 EFLAGS: 00010287
RAX: ffffffff8442603b RBX: 00000000ffffffe4 RCX: 0000000000100000
RDX: ffffc9000f6b1000 RSI: 000000000000ee16 RDI: 000000000000ee17
RBP: ffffc9000f42fa08 R08: ffff88803ca6a580 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000002 R12: ffff888050f72150
R13: fffff52001e85f10 R14: ffff888013324001 R15: ffff888050f72318
FS:  00007f8267e006c0(0000) GS:ffff88808c2c0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f87a48e9d50 CR3: 000000001380a000 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
 scrub_enumerate_chunks+0x7d1/0x13b0 fs/btrfs/scrub.c:2795
 btrfs_scrub_dev+0x6bb/0xf80 fs/btrfs/scrub.c:3168
 btrfs_ioctl_scrub+0x23f/0x4c0 fs/btrfs/ioctl.c:3099
 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: 0033:0x7f8266f9e159
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:00007f8267dfffe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8267226090 RCX: 00007f8266f9e159
RDX: 0000200000000000 RSI: 00000000c400941b RDI: 0000000000000008
RBP: 00007f826703506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8267226128 R14: 00007f8267226090 R15: 00007ffc09173638
 </TASK>