================================================================== BUG: KCSAN: data-race in pcpu_alloc / pcpu_balance_workfn write to 0xffffffff86dea724 of 4 bytes by task 1915 on cpu 1: pcpu_update_empty_pages mm/percpu.c:606 [inline] pcpu_chunk_populated mm/percpu.c:1534 [inline] pcpu_balance_populated mm/percpu.c:2094 [inline] pcpu_balance_workfn+0xb63/0xd10 mm/percpu.c:2245 process_one_work+0x3f6/0x960 kernel/workqueue.c:2307 worker_thread+0x616/0xa70 kernel/workqueue.c:2454 kthread+0x1bf/0x1e0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 read to 0xffffffff86dea724 of 4 bytes by task 15934 on cpu 0: pcpu_alloc+0x99c/0xf50 mm/percpu.c:1877 __alloc_percpu_gfp+0x22/0x30 mm/percpu.c:1936 bpf_map_alloc_percpu+0xab/0x120 kernel/bpf/syscall.c:459 bpf_array_alloc_percpu kernel/bpf/arraymap.c:37 [inline] array_map_alloc+0x2fb/0x3e0 kernel/bpf/arraymap.c:150 find_and_alloc_map kernel/bpf/syscall.c:128 [inline] map_create kernel/bpf/syscall.c:865 [inline] __sys_bpf+0x4803/0xa3c0 kernel/bpf/syscall.c:4616 __do_sys_bpf kernel/bpf/syscall.c:4738 [inline] __se_sys_bpf kernel/bpf/syscall.c:4736 [inline] __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:4736 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000001 -> 0x00000004 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 15934 Comm: syz-executor.0 Tainted: G W 5.17.0-rc2-syzkaller-00039-g9f7fb8de5d9b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================