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BUG: KCSAN: data-race in pcpu_alloc_noprof / pcpu_block_update_hint_alloc

read-write to 0xffffffff8864c71c of 4 bytes by task 3086 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+0x488/0x4b0 mm/percpu.c:1258
 pcpu_alloc_noprof+0x4b3/0x10c0 mm/percpu.c:1834
 xt_percpu_counter_alloc+0x79/0x110 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_filter_table_init+0x88/0xb0 net/ipv4/netfilter/iptable_filter.c:49
 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:4409
 sock_common_getsockopt+0x5b/0x70 net/core/sock.c:3708
 do_sock_getsockopt+0x121/0x1a0 net/socket.c:2386
 __sys_getsockopt+0x19a/0x210 net/socket.c:2415
 __do_sys_getsockopt net/socket.c:2425 [inline]
 __se_sys_getsockopt net/socket.c:2422 [inline]
 __x64_sys_getsockopt+0x66/0x80 net/socket.c:2422
 x64_sys_call+0x128f/0x2e00 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 0xffffffff8864c71c of 4 bytes by task 3093 on cpu 0:
 pcpu_alloc_noprof+0x9a7/0x10c0 mm/percpu.c:1894
 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_nat_table_init+0x42/0x280 net/ipv6/netfilter/ip6table_nat.c:116
 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/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+0x189/0x1f0 net/ipv6/ipv6_sockglue.c:1493
 tcp_getsockopt+0xaa/0xe0 net/ipv4/tcp.c:4409
 sock_common_getsockopt+0x5b/0x70 net/core/sock.c:3708
 do_sock_getsockopt+0x121/0x1a0 net/socket.c:2386
 __sys_getsockopt+0x19a/0x210 net/socket.c:2415
 __do_sys_getsockopt net/socket.c:2425 [inline]
 __se_sys_getsockopt net/socket.c:2422 [inline]
 __x64_sys_getsockopt+0x66/0x80 net/socket.c:2422
 x64_sys_call+0x128f/0x2e00 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

value changed: 0x00000002 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3093 Comm: syz-executor Not tainted 6.10.0-syzkaller-12381-gc33ffdb70cc6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
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