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BUG: KCSAN: data-race in pcpu_alloc / pcpu_balance_workfn

read-write to 0xffffffff870d5b74 of 4 bytes by task 20352 on cpu 0:
 pcpu_update_empty_pages mm/percpu.c:606 [inline]
 pcpu_chunk_populated mm/percpu.c:1534 [inline]
 pcpu_balance_populated mm/percpu.c:2095 [inline]
 pcpu_balance_workfn+0xa58/0xb90 mm/percpu.c:2246
 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 arch/x86/entry/entry_64.S:306

read to 0xffffffff870d5b74 of 4 bytes by task 20865 on cpu 1:
 pcpu_alloc+0x91d/0xf60 mm/percpu.c:1877
 __alloc_percpu_gfp+0x22/0x30 mm/percpu.c:1937
 bpf_map_alloc_percpu+0xbd/0x200 kernel/bpf/syscall.c:481
 prealloc_init kernel/bpf/hashtab.c:325 [inline]
 htab_map_alloc+0x863/0xd70 kernel/bpf/hashtab.c:558
 find_and_alloc_map kernel/bpf/syscall.c:131 [inline]
 map_create+0x38a/0x6f0 kernel/bpf/syscall.c:1106
 __sys_bpf+0x28c/0x630 kernel/bpf/syscall.c:4947
 __do_sys_bpf kernel/bpf/syscall.c:5069 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5067 [inline]
 __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:5067
 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+0x63/0xcd

value changed: 0x00000003 -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20865 Comm: syz-executor.4 Not tainted 6.1.0-rc1-syzkaller-00158-g440b7895c990-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
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