BTRFS error (device loop0): allocation failed flags 10, wanted 4096 tree-log 0, relocation: 0 BTRFS info (device loop0): space_info SYSTEM has 4091904 free, is not full BTRFS info (device loop0): space_info total=4194304, used=4096, pinned=0, reserved=0, may_use=98304, 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 98304 reserved 94208 BTRFS info (device loop0): delayed_block_rsv: size 32768 reserved 32768 BTRFS info (device loop0): delayed_refs_rsv: size 1015808 reserved 950272 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) 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: 1035 at fs/btrfs/block-group.c:3937 do_chunk_alloc fs/btrfs/block-group.c:3937 [inline] WARNING: CPU: 0 PID: 1035 at fs/btrfs/block-group.c:3937 btrfs_chunk_alloc+0xf70/0x10d0 fs/btrfs/block-group.c:4179 Modules linked in: CPU: 0 UID: 0 PID: 1035 Comm: kworker/u4:6 Not tainted 6.14.0-rc4-syzkaller-00015-g2a1944bff549 #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:3937 [inline] RIP: 0010:btrfs_chunk_alloc+0xf70/0x10d0 fs/btrfs/block-group.c:4179 Code: 04 24 48 8b 38 48 c7 c6 80 a9 6e 8c 89 da e8 67 42 19 fd eb 19 e8 40 46 b3 fd 90 48 c7 c7 20 a9 6e 8c 89 de e8 d1 03 73 fd 90 <0f> 0b 90 90 49 bd 00 00 00 00 00 fc ff df 4c 8b 74 24 08 4c 8b 64 RSP: 0018:ffffc900025ff888 EFLAGS: 00010246 RAX: d788c772a1bf7100 RBX: ffffffffffffffe4 RCX: ffff888035d10000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff81817e32 R09: fffffbfff1d3a614 R10: dffffc0000000000 R11: fffffbfff1d3a614 R12: ffff888044ce2183 R13: dffffc0000000000 R14: ffff88803c8a8001 R15: ffff888034291000 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000219000 CR3: 00000000402ae000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: flush_space+0x386/0xd30 fs/btrfs/space-info.c:815 btrfs_async_reclaim_metadata_space+0x178/0x3b0 fs/btrfs/space-info.c:1120 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244