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BUG: KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc

read-write to 0xffffffff883cc4dc of 4 bytes by task 15503 on cpu 1:
 pcpu_update_empty_pages mm/percpu.c:602 [inline]
 pcpu_block_update_hint_alloc+0x5db/0x6a0 mm/percpu.c:923
 pcpu_alloc_area+0x49f/0x4d0 mm/percpu.c:1258
 pcpu_alloc+0x4b3/0x10d0 mm/percpu.c:1808
 __alloc_percpu_gfp+0x26/0x30 mm/percpu.c:1930
 bpf_map_alloc_percpu+0xab/0x200 kernel/bpf/syscall.c:466
 prealloc_init+0x19f/0x470 kernel/bpf/hashtab.c:338
 htab_map_alloc+0x637/0x8f0 kernel/bpf/hashtab.c:573
 map_create+0x83c/0xb90 kernel/bpf/syscall.c:1320
 __sys_bpf+0x667/0x7a0 kernel/bpf/syscall.c:5613
 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5736 [inline]
 __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5736
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

read to 0xffffffff883cc4dc of 4 bytes by task 15500 on cpu 0:
 pcpu_alloc+0x9aa/0x10d0 mm/percpu.c:1868
 __alloc_percpu_gfp+0x26/0x30 mm/percpu.c:1930
 bpf_prog_alloc+0x58/0x160 kernel/bpf/core.c:148
 bpf_prog_load+0x4d1/0x1060 kernel/bpf/syscall.c:2805
 __sys_bpf+0x463/0x7a0 kernel/bpf/syscall.c:5631
 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5736 [inline]
 __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5736
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

value changed: 0x000000a2 -> 0x00000093

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15500 Comm: syz-executor.1 Tainted: G        W          6.8.0-syzkaller-11409-gf6cef5f8c37f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
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