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BUG: KCSAN: data-race in pcpu_alloc_noprof / pcpu_block_update_hint_alloc

read-write to 0xffffffff88be03ac of 4 bytes by task 3315 on cpu 0:
 pcpu_update_empty_pages mm/percpu.c:602 [inline]
 pcpu_block_update_hint_alloc+0x5db/0x6a0 mm/percpu.c:923
 pcpu_alloc_area+0x488/0x4b0 mm/percpu.c:1258
 pcpu_alloc_noprof+0x4bb/0x10a0 mm/percpu.c:1834
 xt_percpu_counter_alloc+0x79/0x110 net/netfilter/x_tables.c:1931
 find_check_entry net/ipv6/netfilter/ip6_tables.c:545 [inline]
 translate_table+0x9b1/0x1040 net/ipv6/netfilter/ip6_tables.c:733
 ip6t_register_table+0x9a/0x440 net/ipv6/netfilter/ip6_tables.c:1751
 ip6table_raw_table_init+0x77/0xa0 net/ipv6/netfilter/ip6table_raw.c:48
 xt_find_table_lock+0x19b/0x2b0 net/netfilter/x_tables.c:1260
 xt_request_find_table_lock+0x26/0xa0 net/netfilter/x_tables.c:1285
 get_info net/ipv6/netfilter/ip6_tables.c:979 [inline]
 do_ip6t_get_ctl+0x554/0xc00 net/ipv6/netfilter/ip6_tables.c:1668
 nf_getsockopt+0x18c/0x1b0 net/netfilter/nf_sockopt.c:116
 ipv6_getsockopt+0x172/0x1e0 net/ipv6/ipv6_sockglue.c:1493
 tcp_getsockopt+0xaa/0xe0 net/ipv4/tcp.c:4670
 sock_common_getsockopt+0x5b/0x70 net/core/sock.c:3776
 do_sock_getsockopt+0x1ca/0x260 net/socket.c:2396
 __sys_getsockopt+0x18a/0x200 net/socket.c:2425
 __do_sys_getsockopt net/socket.c:2435 [inline]
 __se_sys_getsockopt net/socket.c:2432 [inline]
 __x64_sys_getsockopt+0x66/0x80 net/socket.c:2432
 x64_sys_call+0x11cd/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:56
 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

read to 0xffffffff88be03ac of 4 bytes by task 3471 on cpu 1:
 pcpu_alloc_noprof+0x9b6/0x10a0 mm/percpu.c:1894
 bpf_prog_alloc_no_stats+0xf7/0x360 kernel/bpf/core.c:113
 bpf_prog_alloc+0x3a/0x150 kernel/bpf/core.c:145
 bpf_prog_load+0x4d1/0x1070 kernel/bpf/syscall.c:2756
 __sys_bpf+0x463/0x7a0 kernel/bpf/syscall.c:5653
 __do_sys_bpf kernel/bpf/syscall.c:5760 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5758 [inline]
 __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5758
 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: 0x00000002 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3471 Comm: syz.1.8 Not tainted 6.12.0-rc7-syzkaller-00070-g0a9b9d17f3a7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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