================================================================== BUG: KCSAN: data-race in pcpu_alloc / pcpu_free_area write to 0xffffffff88f3dccc of 4 bytes by task 8376 on cpu 0: pcpu_update_empty_pages mm/percpu.c:559 [inline] pcpu_block_update_hint_free mm/percpu.c:994 [inline] pcpu_free_area+0x597/0x640 mm/percpu.c:1254 free_percpu+0x1cb/0x740 mm/percpu.c:2102 xt_percpu_counter_free+0x5f/0x70 net/netfilter/x_tables.c:1861 cleanup_entry+0x170/0x1a0 net/ipv6/netfilter/ip6_tables.c:672 __do_replace+0x46e/0x590 net/ipv6/netfilter/ip6_tables.c:1101 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline] do_ip6t_set_ctl+0x145f/0x1710 net/ipv6/netfilter/ip6_tables.c:1636 nf_setsockopt+0x1a6/0x1c0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x1c38/0x37c0 net/ipv6/ipv6_sockglue.c:1008 tcp_setsockopt+0x8c/0xa0 net/ipv4/tcp.c:3643 sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3257 __sys_setsockopt+0x2e8/0x460 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+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffffffff88f3dccc of 4 bytes by task 8378 on cpu 1: pcpu_alloc+0xb11/0x10a0 mm/percpu.c:1835 __alloc_percpu+0x20/0x30 mm/percpu.c:1907 xt_percpu_counter_alloc+0x6b/0x110 net/netfilter/x_tables.c:1841 find_check_entry net/ipv4/netfilter/ip_tables.c:527 [inline] translate_table+0x97f/0xfc0 net/ipv4/netfilter/ip_tables.c:717 do_replace net/ipv4/netfilter/ip_tables.c:1135 [inline] do_ipt_set_ctl+0x1388/0x1670 net/ipv4/netfilter/ip_tables.c:1627 nf_setsockopt+0x1a6/0x1c0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0x2725/0x2b50 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+0x2e8/0x460 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+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8378 Comm: syz-executor.3 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================