BTRFS info (device loop1): block group 1048576 has 4194304 bytes, 4096 used 0 pinned 0 reserved 0 zone_unusable [readonly] BTRFS info (device loop1): block group has cluster?: no BTRFS info (device loop1): 0 blocks of free space at or bigger than bytes is ------------[ cut here ]------------ WARNING: CPU: 0 PID: 535 at fs/btrfs/block-group.c:3509 do_chunk_alloc fs/btrfs/block-group.c:3509 [inline] WARNING: CPU: 0 PID: 535 at fs/btrfs/block-group.c:3509 btrfs_chunk_alloc+0xa70/0xeb4 fs/btrfs/block-group.c:3732 Modules linked in: CPU: 0 PID: 535 Comm: kworker/u4:5 Not tainted 5.15.185-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_unbound btrfs_async_reclaim_metadata_space pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : do_chunk_alloc fs/btrfs/block-group.c:3509 [inline] pc : btrfs_chunk_alloc+0xa70/0xeb4 fs/btrfs/block-group.c:3732 lr : do_chunk_alloc fs/btrfs/block-group.c:3509 [inline] lr : btrfs_chunk_alloc+0xa70/0xeb4 fs/btrfs/block-group.c:3732 sp : ffff80001fb677d0 x29: ffff80001fb67820 x28: 1fffe0001b97773d x27: ffff0000dcbbb9eb x26: ffffffffffffffe4 x25: dfff800000000000 x24: ffff0000dcbbb9a0 x23: ffff0000ea8dc000 x22: ffff0000cc3c9084 x21: ffff0000cfb29000 x20: ffff0000cc3c9000 x19: ffff0000cc3c9088 x18: 0000000000000001 x17: 0000000000000000 x16: ffff8000111a97c4 x15: 00000000ffffffff x14: 0000000000ff0100 x13: 0000000000000001 x12: 0000000000ff0100 x11: 0000000000000000 x10: 0000000000000000 x9 : cf444e0e6c1aa200 x8 : cf444e0e6c1aa200 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001fb670b8 x4 : ffff80001423f280 x3 : ffff800008503958 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000026 Call trace: do_chunk_alloc fs/btrfs/block-group.c:3509 [inline] btrfs_chunk_alloc+0xa70/0xeb4 fs/btrfs/block-group.c:3732 flush_space+0x3f4/0xbd8 fs/btrfs/space-info.c:670 btrfs_async_reclaim_metadata_space+0x678/0x7b0 fs/btrfs/space-info.c:953 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310 worker_thread+0x8f4/0x101c kernel/workqueue.c:2457 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 irq event stamp: 1676684 hardirqs last enabled at (1676683): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257 hardirqs last disabled at (1676684): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (1676552): [] softirq_handle_end kernel/softirq.c:419 [inline] softirqs last enabled at (1676552): [] handle_softirqs+0xa4c/0xbf0 kernel/softirq.c:604 softirqs last disabled at (1676539): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (1676539): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (1676539): [] invoke_softirq kernel/softirq.c:457 [inline] softirqs last disabled at (1676539): [] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 ---[ end trace 16f719d12f96f974 ]--- BTRFS: error (device loop1) in do_chunk_alloc:3509: errno=-28 No space left BTRFS info (device loop1): forced readonly BTRFS error (device loop1): allocation failed flags 2, wanted 4096 tree-log 0, relocation: 0 BTRFS info (device loop1): space_info 2 has -4096 free, is not full BTRFS info (device loop1): space_info total=4194304, used=4096, pinned=0, reserved=0, may_use=4096, readonly=4190208 zone_unusable=0 BTRFS info (device loop1): global_block_rsv: size 851968 reserved 851968 BTRFS info (device loop1): trans_block_rsv: size 0 reserved 0 BTRFS info (device loop1): chunk_block_rsv: size 0 reserved 0 BTRFS info (device loop1): delayed_block_rsv: size 0 reserved 0 BTRFS info (device loop1): delayed_refs_rsv: size 196608 reserved 126976 BTRFS info (device loop1): block group 1048576 has 4194304 bytes, 4096 used 0 pinned 0 reserved 0 zone_unusable [readonly] BTRFS info (device loop1): block group has cluster?: no BTRFS info (device loop1): 0 blocks of free space at or bigger than bytes is BTRFS: error (device loop1) in btrfs_create_pending_block_groups:2447: errno=-28 No space left