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 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 294912 reserved 294912
BTRFS info (device loop0): delayed_refs_rsv: size 851968 reserved 851968
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: 4327 at fs/btrfs/block-group.c:3943 do_chunk_alloc fs/btrfs/block-group.c:3943 [inline]
WARNING: CPU: 0 PID: 4327 at fs/btrfs/block-group.c:3943 btrfs_chunk_alloc+0xebe/0xf80 fs/btrfs/block-group.c:4185
Modules linked in:
CPU: 0 UID: 0 PID: 4327 Comm: kworker/u4:12 Not tainted 6.11.0-syzkaller-08481-g88264981f208 #0
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:3943 [inline]
RIP: 0010:btrfs_chunk_alloc+0xebe/0xf80 fs/btrfs/block-group.c:4185
Code: 00 9f 4e 8c 89 de e8 f1 13 7b fd 90 0f 0b 90 90 e9 23 fe ff ff e8 82 25 ba fd 90 48 c7 c7 00 9f 4e 8c 89 de e8 d3 13 7b fd 90 <0f> 0b 90 90 e9 25 fe ff ff e8 64 25 ba fd 90 48 c7 c7 00 9f 4e 8c
RSP: 0018:ffffc9000dcaf908 EFLAGS: 00010246
RAX: b106be0794084e00 RBX: ffffffffffffffe4 RCX: ffff88803de0a440
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff88803fb71250 R08: ffffffff8155aaa2 R09: 1ffff11003f8519a
R10: dffffc0000000000 R11: ffffed1003f8519b R12: ffff88804ae56800
R13: dffffc0000000000 R14: ffff888012e68001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7070917da0 CR3: 0000000012e82000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 flush_space+0x4c0/0xd00 fs/btrfs/space-info.c:808
 btrfs_async_reclaim_metadata_space+0x28e/0x350 fs/btrfs/space-info.c:1105
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>