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BUG: KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc

read-write to 0xffffffff884054dc of 4 bytes by task 7310 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+0x24/0x30 mm/percpu.c:1943
 xt_percpu_counter_alloc+0x72/0x110 net/netfilter/x_tables.c:1931
 find_check_entry net/ipv4/netfilter/ip_tables.c:526 [inline]
 translate_table+0x921/0xf70 net/ipv4/netfilter/ip_tables.c:716
 ipt_register_table+0x9a/0x430 net/ipv4/netfilter/ip_tables.c:1742
 iptable_mangle_table_init+0x4e/0x70 net/ipv4/netfilter/iptable_mangle.c:92
 xt_find_table_lock+0x194/0x260 net/netfilter/x_tables.c:1260
 xt_request_find_table_lock+0x26/0xa0 net/netfilter/x_tables.c:1285
 get_info net/ipv4/netfilter/ip_tables.c:963 [inline]
 do_ipt_get_ctl+0x554/0xbe0 net/ipv4/netfilter/ip_tables.c:1659
 nf_getsockopt+0x18c/0x1b0 net/netfilter/nf_sockopt.c:116
 ip_getsockopt+0x12a/0x170 net/ipv4/ip_sockglue.c:1777
 tcp_getsockopt+0xaa/0xe0 net/ipv4/tcp.c:4375
 sock_common_getsockopt+0x5b/0x70 net/core/sock.c:3700
 do_sock_getsockopt+0x121/0x1a0 net/socket.c:2373
 __sys_getsockopt+0x19a/0x210 net/socket.c:2402
 __do_sys_getsockopt net/socket.c:2412 [inline]
 __se_sys_getsockopt net/socket.c:2409 [inline]
 __x64_sys_getsockopt+0x66/0x80 net/socket.c:2409
 x64_sys_call+0x2ce9/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:56
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff884054dc of 4 bytes by task 6286 on cpu 0:
 pcpu_alloc+0x9aa/0x10d0 mm/percpu.c:1868
 __alloc_percpu+0x24/0x30 mm/percpu.c:1943
 mm_alloc_cid include/linux/mm_types.h:1175 [inline]
 mm_init+0x462/0x6d0 kernel/fork.c:1301
 dup_mm kernel/fork.c:1685 [inline]
 copy_mm+0x11d/0x1040 kernel/fork.c:1737
 copy_process+0xee1/0x1f80 kernel/fork.c:2390
 kernel_clone+0x16a/0x570 kernel/fork.c:2797
 __do_sys_clone kernel/fork.c:2940 [inline]
 __se_sys_clone kernel/fork.c:2924 [inline]
 __x64_sys_clone+0xe8/0x120 kernel/fork.c:2924
 x64_sys_call+0x23cb/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000008e -> 0x0000008d

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6286 Comm: syz-executor.3 Not tainted 6.9.0-rc5-syzkaller-00355-g2c8159388952 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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