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BUG: KCSAN: data-race in pcpu_alloc / pcpu_balance_workfn

read-write to 0xffffffff86e57674 of 4 bytes by task 883 on cpu 1:
 pcpu_update_empty_pages mm/percpu.c:602 [inline]
 pcpu_chunk_populated mm/percpu.c:1531 [inline]
 pcpu_balance_populated mm/percpu.c:2088 [inline]
 pcpu_balance_workfn+0x96f/0xa80 mm/percpu.c:2238
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2289
 worker_thread+0x5ef/0xa10 kernel/workqueue.c:2436
 kthread+0x1ac/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffffffff86e57674 of 4 bytes by task 28171 on cpu 0:
 pcpu_alloc+0x9cf/0x10c0 mm/percpu.c:1870
 __alloc_percpu_gfp+0x26/0x30 mm/percpu.c:1930
 bpf_map_alloc_percpu+0xaa/0x200 kernel/bpf/syscall.c:481
 prealloc_init kernel/bpf/hashtab.c:322 [inline]
 htab_map_alloc+0x8ee/0xe30 kernel/bpf/hashtab.c:555
 find_and_alloc_map kernel/bpf/syscall.c:131 [inline]
 map_create+0x398/0x6f0 kernel/bpf/syscall.c:1123
 __sys_bpf+0x60c/0x810 kernel/bpf/syscall.c:4951
 __do_sys_bpf kernel/bpf/syscall.c:5073 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5071 [inline]
 __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5071
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000003 -> 0xfffffffc

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 28171 Comm: syz-executor.0 Tainted: G        W          6.2.0-rc8-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
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