BTRFS info (device loop0): balance: start -d -m
BTRFS info (device loop0): relocating block group 6881280 flags data|metadata
BTRFS info (device loop0): relocating block group 5242880 flags data|metadata
BTRFS error (device loop0): allocation failed flags 4, wanted 4096 tree-log 0, relocation: 0
BTRFS info (device loop0): space_info DATA+METADATA (sub-group id 0) has -2490368 free, is full
BTRFS info (device loop0): space_info total=9895936, used=61440, pinned=16384, reserved=8257536, may_use=2490368, readonly=1560576 zone_unusable=0
BTRFS info (device loop0): global_block_rsv: size 1441792 reserved 1437696
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 0 reserved 0
BTRFS info (device loop0): delayed_refs_rsv: size 0 reserved 0
BTRFS info (device loop0): block group 5242880 has 1638400 bytes, 61440 used 16384 pinned 0 reserved 0 delalloc 0 super 0 zone_unusable (1560576 bytes available) [readonly]
BTRFS critical (device loop0): entry offset 5242880, bytes 12288, bitmap no
BTRFS critical (device loop0): entry offset 5259264, bytes 8192, bitmap no
BTRFS critical (device loop0): entry offset 5271552, bytes 20480, bitmap no
BTRFS critical (device loop0): entry offset 5316608, bytes 40960, bitmap no
BTRFS critical (device loop0): entry offset 5361664, bytes 8192, bitmap no
BTRFS critical (device loop0): entry offset 5373952, bytes 40960, bitmap no
BTRFS critical (device loop0): entry offset 5451776, bytes 1429504, 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): 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): 9818112 bytes available across all block groups
BTRFS warning (device loop0): Skipping commit of aborted transaction.
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 0 PID: 5326 at fs/btrfs/transaction.c:2020 cleanup_transaction fs/btrfs/transaction.c:2020 [inline]
WARNING: CPU: 0 PID: 5326 at fs/btrfs/transaction.c:2020 btrfs_commit_transaction+0x2f67/0x3950 fs/btrfs/transaction.c:2611
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~bpo12+1 04/01/2014
RIP: 0010:cleanup_transaction fs/btrfs/transaction.c:2020 [inline]
RIP: 0010:btrfs_commit_transaction+0x2f67/0x3950 fs/btrfs/transaction.c:2611
Code: 2f e5 d7 fd 84 c0 74 2b e8 66 a9 f1 fd eb 73 e8 5f a9 f1 fd 90 48 c7 c7 80 79 ae 8b 8b 5c 24 18 89 de e8 ac b5 b4 fd 89 d9 90 <0f> 0b 90 90 e9 1a 01 00 00 e8 bb 3e 7a 07 89 c3 31 ff 89 c6 e8 70
RSP: 0018:ffffc9000d3f74e0 EFLAGS: 00010246
RAX: 8c4ca2ac2e3eba00 RBX: 00000000ffffffe4 RCX: 00000000ffffffe4
RDX: ffffc9000e913000 RSI: 0000000000031e7e RDI: 0000000000031e7f
RBP: ffffc9000d3f7808 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bba684 R12: ffff888030aedbb8
R13: ffff888051f74000 R14: ffff888051f74000 R15: 0000000000000000
FS:  00007f2aa25a46c0(0000) GS:ffff88808d72f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2aa2561fc8 CR3: 00000000421ab000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 prepare_to_relocate+0x39f/0x490 fs/btrfs/relocation.c:3489
 relocate_block_group+0x132/0xd70 fs/btrfs/relocation.c:3514
 btrfs_relocate_block_group+0x6bc/0xc60 fs/btrfs/relocation.c:3983
 btrfs_relocate_chunk+0x12f/0x5c0 fs/btrfs/volumes.c:3451
 __btrfs_balance+0x1860/0x23f0 fs/btrfs/volumes.c:4227
 btrfs_balance+0xac2/0x11b0 fs/btrfs/volumes.c:4604
 btrfs_ioctl_balance+0x3d3/0x610 fs/btrfs/ioctl.c:3577
 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:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2aa178f749
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:00007f2aa25a4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2aa19e6090 RCX: 00007f2aa178f749
RDX: 0000200000000440 RSI: 00000000c4009420 RDI: 0000000000000003
RBP: 00007f2aa1813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2aa19e6128 R14: 00007f2aa19e6090 R15: 00007ffd74379358
 </TASK>