SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pid=4522 comm=syz-executor.2
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BUG: KCSAN: data-race in pcpu_alloc / pcpu_free_area

write to 0xffffffff8454374c of 4 bytes by task 1752 on cpu 1:
 pcpu_update_empty_pages mm/percpu.c:559 [inline]
 pcpu_block_update_hint_free mm/percpu.c:994 [inline]
 pcpu_free_area+0x531/0x5e0 mm/percpu.c:1254
 free_percpu+0x1d2/0x690 mm/percpu.c:2102
 xt_percpu_counter_free+0x5f/0x70 net/netfilter/x_tables.c:1855
 cleanup_entry+0x15a/0x180 net/ipv4/netfilter/ip_tables.c:655
 __do_replace+0x45e/0x580 net/ipv4/netfilter/ip_tables.c:1084
 do_replace net/ipv4/netfilter/ip_tables.c:1139 [inline]
 do_ipt_set_ctl+0x6ac/0x1630 net/ipv4/netfilter/ip_tables.c:1629
 nf_setsockopt+0x1a6/0x1c0 net/netfilter/nf_sockopt.c:101
 ip_setsockopt+0x2602/0x2a20 net/ipv4/ip_sockglue.c:1435
 tcp_setsockopt+0x8c/0xa0 net/ipv4/tcp.c:3643
 sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3257
 __sys_setsockopt+0x18f/0x200 net/socket.c:2117
 __do_sys_setsockopt net/socket.c:2128 [inline]
 __se_sys_setsockopt net/socket.c:2125 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2125
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff8454374c of 4 bytes by task 4522 on cpu 0:
 pcpu_alloc+0x9d6/0x1170 mm/percpu.c:1835
 __alloc_percpu+0x20/0x30 mm/percpu.c:1907
 alloc_netdev_mqs+0xd2/0x770 net/core/dev.c:10703
 sit_init_net+0x123/0x330 net/ipv6/sit.c:1903
 ops_init+0x1e7/0x230 net/core/net_namespace.c:140
 setup_net+0x1cb/0x700 net/core/net_namespace.c:333
 copy_net_ns+0x2a9/0x450 net/core/net_namespace.c:474
 create_new_namespaces+0x231/0x560 kernel/nsproxy.c:110
 copy_namespaces+0x111/0x160 kernel/nsproxy.c:178
 copy_process+0x1273/0x2e20 kernel/fork.c:2116
 kernel_clone+0x14b/0x680 kernel/fork.c:2500
 __do_sys_clone kernel/fork.c:2617 [inline]
 __se_sys_clone kernel/fork.c:2601 [inline]
 __x64_sys_clone+0xb4/0xe0 kernel/fork.c:2601
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4522 Comm: syz-executor.2 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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