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BUG: KCSAN: data-race in pcpu_alloc / pcpu_balance_workfn

read-write to 0xffffffff86e8f9bc of 4 bytes by task 26432 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+0xb27/0xce0 mm/percpu.c:2245
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

read to 0xffffffff86e8f9bc of 4 bytes by task 360 on cpu 0:
 pcpu_alloc+0x9bb/0xfb0 mm/percpu.c:1877
 __alloc_percpu_gfp+0x22/0x30 mm/percpu.c:1936
 bpf_map_alloc_percpu+0xab/0x120 kernel/bpf/syscall.c:460
 prealloc_init kernel/bpf/hashtab.c:326 [inline]
 htab_map_alloc+0x76e/0xc00 kernel/bpf/hashtab.c:538
 find_and_alloc_map kernel/bpf/syscall.c:129 [inline]
 map_create+0x38a/0x6e0 kernel/bpf/syscall.c:864
 __sys_bpf+0x269/0x600 kernel/bpf/syscall.c:4645
 __do_sys_bpf kernel/bpf/syscall.c:4767 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4765 [inline]
 __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:4765
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000003 -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 360 Comm: syz-executor.3 Not tainted 5.18.0-rc5-syzkaller-00014-gef8e4d3c2ab1-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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