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BUG: KCSAN: data-race in pcpu_alloc_noprof / pcpu_free_area

read-write to 0xffffffff88bdd3ac of 4 bytes by task 7940 on cpu 0:
 pcpu_update_empty_pages mm/percpu.c:602 [inline]
 pcpu_block_update_hint_free mm/percpu.c:1044 [inline]
 pcpu_free_area+0x4dc/0x570 mm/percpu.c:1302
 free_percpu+0x1c6/0xb30 mm/percpu.c:2246
 xt_percpu_counter_free+0x63/0x80 net/netfilter/x_tables.c:1951
 cleanup_entry+0x195/0x1c0 net/ipv6/netfilter/ip6_tables.c:671
 __do_replace+0x470/0x580 net/ipv6/netfilter/ip6_tables.c:1099
 do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline]
 do_ip6t_set_ctl+0x820/0x8c0 net/ipv6/netfilter/ip6_tables.c:1644
 nf_setsockopt+0x195/0x1b0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x10f/0x130 net/ipv6/ipv6_sockglue.c:998
 tcp_setsockopt+0x93/0xb0 net/ipv4/tcp.c:4029
 sock_common_setsockopt+0x64/0x80 net/core/sock.c:3803
 do_sock_setsockopt net/socket.c:2329 [inline]
 __sys_setsockopt+0x1cc/0x240 net/socket.c:2352
 __do_sys_setsockopt net/socket.c:2361 [inline]
 __se_sys_setsockopt net/socket.c:2358 [inline]
 __x64_sys_setsockopt+0x66/0x80 net/socket.c:2358
 x64_sys_call+0x278d/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:55
 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 0xffffffff88bdd3ac of 4 bytes by task 8112 on cpu 1:
 pcpu_alloc_noprof+0x9a7/0x10c0 mm/percpu.c:1894
 qdisc_alloc+0x289/0x450 net/sched/sch_generic.c:963
 qdisc_create_dflt+0x4c/0x280 net/sched/sch_generic.c:1008
 mq_init+0x1b9/0x380 net/sched/sch_mq.c:90
 qdisc_create_dflt+0xce/0x280 net/sched/sch_generic.c:1015
 attach_default_qdiscs net/sched/sch_generic.c:1197 [inline]
 dev_activate+0xd9/0x9e0 net/sched/sch_generic.c:1251
 __dev_open+0x263/0x2e0 net/core/dev.c:1485
 __dev_change_flags+0x155/0x410 net/core/dev.c:8841
 dev_change_flags+0x59/0xd0 net/core/dev.c:8913
 dev_ifsioc+0x67f/0xa10 net/core/dev_ioctl.c:526
 dev_ioctl+0x7fa/0xab0 net/core/dev_ioctl.c:783
 sock_do_ioctl+0x11c/0x260 net/socket.c:1241
 sock_ioctl+0x46a/0x640 net/socket.c:1346
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xcd/0x140 fs/ioctl.c:893
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:893
 x64_sys_call+0x15cc/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:17
 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: 0x00000063 -> 0x00000064

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 8112 Comm: syz.2.1646 Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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syzkaller0: entered promiscuous mode
syzkaller0: entered allmulticast mode