BTRFS info (device loop4): 0 free space entries at or bigger than 4096 bytes
BTRFS info (device loop4): 4190208 bytes available across all block groups
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 0 PID: 2254 at fs/btrfs/block-group.c:4000 do_chunk_alloc fs/btrfs/block-group.c:4000 [inline]
WARNING: CPU: 0 PID: 2254 at fs/btrfs/block-group.c:4000 btrfs_chunk_alloc+0xfd4/0x150c fs/btrfs/block-group.c:4241
Modules linked in:
CPU: 0 UID: 0 PID: 2254 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : do_chunk_alloc fs/btrfs/block-group.c:4000 [inline]
pc : btrfs_chunk_alloc+0xfd4/0x150c fs/btrfs/block-group.c:4241
lr : do_chunk_alloc fs/btrfs/block-group.c:4000 [inline]
lr : btrfs_chunk_alloc+0xfd4/0x150c fs/btrfs/block-group.c:4241
sp : ffff8000a22677e0
x29: ffff8000a2267840 x28: ffff0000f57ea800 x27: ffffffffffffffe4
x26: 0000000000000001 x25: ffff0000f7d7c000 x24: ffff0000dea9a0b4
x23: dfff800000000000 x22: dfff800000000000 x21: 0000000000000000
x20: 0000000000000000 x19: ffff0000dea9a000 x18: 00000000ffffffff
x17: ffff80008255ea94 x16: ffff80008b01d7f0 x15: 0000000000000001
x14: 1ffff0001444ce30 x13: 0000000000000000 x12: 0000000000000000
x11: 000000009ea95d88 x10: 0000000000ff0100 x9 : c132b9000ddec900
x8 : c132b9000ddec900 x7 : ffff80008056556c x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000002 x1 : 0000000100000000 x0 : 0000000000000000
Call trace:
 do_chunk_alloc fs/btrfs/block-group.c:4000 [inline] (P)
 btrfs_chunk_alloc+0xfd4/0x150c fs/btrfs/block-group.c:4241 (P)
 flush_space+0x2f0/0xb68 fs/btrfs/space-info.c:861
 do_async_reclaim_metadata_space+0x110/0x364 fs/btrfs/space-info.c:1158
 btrfs_async_reclaim_metadata_space+0x90/0xd8 fs/btrfs/space-info.c:1226
 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x958/0xed8 kernel/workqueue.c:3400
 kthread+0x5fc/0x75c kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
irq event stamp: 272662
hardirqs last  enabled at (272661): [<ffff80008055b35c>] vprintk_store+0x898/0xac8 kernel/printk/printk.c:2356
hardirqs last disabled at (272662): [<ffff80008b016974>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:434
softirqs last  enabled at (272074): [<ffff800080201608>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (272072): [<ffff8000802015d4>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
BTRFS info (device loop4 state A): dumping space info:
BTRFS info (device loop4 state A): space_info DATA+METADATA (sub-group id 0) has 8814592 free, is not full
BTRFS info (device loop4 state A): space_info total=11534336, used=53248, pinned=0, reserved=12288, may_use=2654208, readonly=0 zone_unusable=0
BTRFS info (device loop4 state A): space_info SYSTEM (sub-group id 0) has -98304 free, is not full
BTRFS info (device loop4 state A): space_info total=4194304, used=4096, pinned=0, reserved=0, may_use=98304, readonly=4190208 zone_unusable=0
BTRFS info (device loop4 state A): global_block_rsv: size 1441792 reserved 1441792
BTRFS info (device loop4 state A): trans_block_rsv: size 0 reserved 0
BTRFS info (device loop4 state A): chunk_block_rsv: size 98304 reserved 98304
BTRFS info (device loop4 state A): delayed_block_rsv: size 360448 reserved 360448
BTRFS info (device loop4 state A): delayed_refs_rsv: size 851968 reserved 851968
BTRFS: error (device loop4 state A) in do_chunk_alloc:4000: errno=-28 No space left
BTRFS info (device loop4 state EA): forced readonly
BTRFS info (device loop4 state EA): space_info SYSTEM (sub-group id 0) has 0 free, is not full
BTRFS info (device loop4 state EA): space_info total=4194304, used=4096, pinned=0, reserved=0, may_use=0, readonly=4190208 zone_unusable=0
BTRFS info (device loop4 state EA): global_block_rsv: size 1441792 reserved 1441792
BTRFS info (device loop4 state EA): trans_block_rsv: size 0 reserved 0
BTRFS info (device loop4 state EA): chunk_block_rsv: size 0 reserved 0
BTRFS info (device loop4 state EA): delayed_block_rsv: size 360448 reserved 360448
BTRFS info (device loop4 state EA): delayed_refs_rsv: size 1114112 reserved 847872