BTRFS info (device loop0): space_info DATA+METADATA has 1773568 free, is not full
BTRFS info (device loop0): space_info total=3276800, used=53248, pinned=0, reserved=8192, may_use=1441792, 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 0 reserved 0
BTRFS info (device loop0): delayed_refs_rsv: size 524288 reserved 0
BTRFS info (device loop0): space_info DATA+METADATA has 1773568 free, is not full
BTRFS info (device loop0): space_info total=3276800, used=53248, pinned=0, reserved=12288, may_use=1437696, readonly=0 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 786432 reserved 0
BTRFS info (device loop0): space_info DATA+METADATA has 1773568 free, is not full
BTRFS info (device loop0): space_info total=3276800, used=53248, pinned=16384, reserved=4096, may_use=1429504, readonly=0 zone_unusable=0
BTRFS info (device loop0): global_block_rsv: size 1441792 reserved 1429504
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 262144 reserved 0
BTRFS info (device loop0): space_info DATA+METADATA has 1773568 free, is not full
BTRFS info (device loop0): space_info total=3276800, used=53248, pinned=16384, reserved=8192, may_use=1425408, readonly=0 zone_unusable=0
BTRFS info (device loop0): global_block_rsv: size 1441792 reserved 1425408
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 524288 reserved 0
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 917504 reserved 643072
BTRFS info (device loop0): chunk_block_rsv: size 98304 reserved 94208
BTRFS info (device loop0): delayed_block_rsv: size 262144 reserved 262144
BTRFS info (device loop0): delayed_refs_rsv: size 1507328 reserved 716800
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): 4190208 bytes available across all block groups
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 0 PID: 1034 at fs/btrfs/block-group.c:3972 do_chunk_alloc fs/btrfs/block-group.c:3972 [inline]
WARNING: CPU: 0 PID: 1034 at fs/btrfs/block-group.c:3972 btrfs_chunk_alloc+0xe7c/0x10b0 fs/btrfs/block-group.c:4214
Modules linked in:
CPU: 0 UID: 0 PID: 1034 Comm: kworker/u4:6 Not tainted 6.15.0-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
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:3972 [inline]
RIP: 0010:btrfs_chunk_alloc+0xe7c/0x10b0 fs/btrfs/block-group.c:4214
Code: 48 c7 c6 00 5d af 8b 44 89 f2 e8 1f de 47 fd e9 05 fd ff ff e8 75 bb dd fd 90 48 c7 c7 a0 5c af 8b 44 89 f6 e8 f5 17 a2 fd 90 <0f> 0b 90 90 e9 e6 fc ff ff e8 56 bb dd fd eb 05 e8 4f bb dd fd 48
RSP: 0018:ffffc90002597838 EFLAGS: 00010246
RAX: 7c6743db51c0a900 RBX: 0000000000000000 RCX: ffff8880351f0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 00000000ffffff01 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bba984 R12: ffff888054468000
R13: dffffc0000000000 R14: ffffffffffffffe4 R15: ffff8880456e0000
FS:  0000000000000000(0000) GS:ffff88808d6c2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559f70e5f490 CR3: 0000000011fac000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 flush_space+0x2fe/0xcc0 fs/btrfs/space-info.c:815
 btrfs_async_reclaim_metadata_space+0x185/0x3d0 fs/btrfs/space-info.c:1120
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>