BTRFS info (device loop0): space_info DATA+METADATA (sub-group id 0) 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 (sub-group id 0) 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 (sub-group id 0) has 1781760 free, is not full BTRFS info (device loop0): space_info total=3276800, used=53248, pinned=0, reserved=4096, 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 262144 reserved 0 BTRFS info (device loop0): space_info DATA+METADATA (sub-group id 0) has 1781760 free, is not full BTRFS info (device loop0): space_info total=3276800, used=53248, pinned=0, reserved=8192, may_use=1433600, readonly=0 zone_unusable=0 BTRFS info (device loop0): global_block_rsv: size 1441792 reserved 1433600 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 (sub-group id 0) 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 327680 reserved 327680 BTRFS info (device loop0): delayed_refs_rsv: size 851968 reserved 786432 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: 38 at fs/btrfs/block-group.c:4000 do_chunk_alloc fs/btrfs/block-group.c:4000 [inline] WARNING: CPU: 0 PID: 38 at fs/btrfs/block-group.c:4000 btrfs_chunk_alloc+0xf9d/0x1460 fs/btrfs/block-group.c:4241 Modules linked in: CPU: 0 UID: 0 PID: 38 Comm: kworker/u4:3 Not tainted 6.16.0-syzkaller-09014-gd6084bb815c4 #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:4000 [inline] RIP: 0010:btrfs_chunk_alloc+0xf9d/0x1460 fs/btrfs/block-group.c:4241 Code: ba fd 84 c0 0f 84 63 01 00 00 e8 8e f4 d3 fd e9 8c 03 00 00 e8 84 f4 d3 fd 90 48 c7 c7 60 ee cf 8b 44 89 f6 e8 14 8c 97 fd 90 <0f> 0b 90 90 e9 3e fc ff ff e8 65 f4 d3 fd eb 05 e8 5e f4 d3 fd e8 RSP: 0018:ffffc90000597778 EFLAGS: 00010246 RAX: 6f64333da86be600 RBX: ffff88805342c001 RCX: ffff88801e572440 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002 RBP: 0000000000000000 R08: ffff88801fc24253 R09: 1ffff11003f8484a R10: dffffc0000000000 R11: ffffed1003f8484b R12: dffffc0000000000 R13: ffff888034943800 R14: ffffffffffffffe4 R15: ffff888044218128 FS: 0000000000000000(0000) GS:ffff88808d26b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005654faedd4a0 CR3: 000000003fccf000 CR4: 0000000000352ef0 Call Trace: flush_space+0x30b/0xcd0 fs/btrfs/space-info.c:861 do_async_reclaim_metadata_space+0x144/0x390 fs/btrfs/space-info.c:1158 btrfs_async_reclaim_metadata_space+0x89/0xe0 fs/btrfs/space-info.c:1226 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245