================================================================== BUG: KCSAN: data-race in pcpu_alloc_noprof / pcpu_free_area read-write to 0xffffffff88bdf3ac of 4 bytes by task 4053 on cpu 1: pcpu_update_empty_pages mm/percpu.c:602 [inline] pcpu_block_update_hint_free mm/percpu.c:1044 [inline] pcpu_free_area+0x4dc/0x570 mm/percpu.c:1302 free_percpu+0x1c6/0xb30 mm/percpu.c:2246 htab_free_elems kernel/bpf/hashtab.c:287 [inline] prealloc_destroy+0xea/0x1a0 kernel/bpf/hashtab.c:382 htab_map_free+0x4a0/0x620 kernel/bpf/hashtab.c:1561 bpf_map_free kernel/bpf/syscall.c:744 [inline] bpf_map_free_deferred+0xb0/0x140 kernel/bpf/syscall.c:768 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3310 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3391 kthread+0x1d1/0x210 kernel/kthread.c:389 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 read to 0xffffffff88bdf3ac of 4 bytes by task 9040 on cpu 0: pcpu_alloc_noprof+0x9b6/0x10a0 mm/percpu.c:1894 bpf_map_alloc_percpu+0xad/0x210 kernel/bpf/syscall.c:466 bpf_array_alloc_percpu kernel/bpf/arraymap.c:38 [inline] array_map_alloc+0x2aa/0x390 kernel/bpf/arraymap.c:152 map_create+0x850/0xb70 kernel/bpf/syscall.c:1341 __sys_bpf+0x667/0x7a0 kernel/bpf/syscall.c:5631 __do_sys_bpf kernel/bpf/syscall.c:5756 [inline] __se_sys_bpf kernel/bpf/syscall.c:5754 [inline] __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5754 x64_sys_call+0x2625/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000084 -> 0x00000087 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 9040 Comm: syz.0.2975 Not tainted 6.12.0-rc4-syzkaller-00047-gc2ee9f594da8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ==================================================================