================================================================== BUG: KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc read-write to 0xffffffff86ef831c of 4 bytes by task 3120 on cpu 0: 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+0x4bd/0x10b0 mm/percpu.c:1808 __alloc_percpu+0x24/0x30 mm/percpu.c:1943 xt_percpu_counter_alloc+0x72/0x110 net/netfilter/x_tables.c:1930 find_check_entry net/ipv4/netfilter/ip_tables.c:526 [inline] translate_table+0x90b/0xf60 net/ipv4/netfilter/ip_tables.c:716 do_replace net/ipv4/netfilter/ip_tables.c:1133 [inline] do_ipt_set_ctl+0x13f0/0x1730 net/ipv4/netfilter/ip_tables.c:1627 nf_setsockopt+0x18d/0x1b0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0xe6/0x100 net/ipv4/ip_sockglue.c:1426 tcp_setsockopt+0x90/0xa0 net/ipv4/tcp.c:3704 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3711 do_sock_setsockopt net/socket.c:2311 [inline] __sys_setsockopt+0x1d4/0x240 net/socket.c:2334 __do_sys_setsockopt net/socket.c:2343 [inline] __se_sys_setsockopt net/socket.c:2340 [inline] __x64_sys_setsockopt+0x66/0x80 net/socket.c:2340 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b read to 0xffffffff86ef831c of 4 bytes by task 3101 on cpu 1: pcpu_alloc+0x9bc/0x10b0 mm/percpu.c:1868 __alloc_percpu+0x24/0x30 mm/percpu.c:1943 xt_percpu_counter_alloc+0x72/0x110 net/netfilter/x_tables.c:1930 find_check_entry net/ipv4/netfilter/ip_tables.c:526 [inline] translate_table+0x90b/0xf60 net/ipv4/netfilter/ip_tables.c:716 do_replace net/ipv4/netfilter/ip_tables.c:1133 [inline] do_ipt_set_ctl+0x13f0/0x1730 net/ipv4/netfilter/ip_tables.c:1627 nf_setsockopt+0x18d/0x1b0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0xe6/0x100 net/ipv4/ip_sockglue.c:1426 tcp_setsockopt+0x90/0xa0 net/ipv4/tcp.c:3704 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3711 do_sock_setsockopt net/socket.c:2311 [inline] __sys_setsockopt+0x1d4/0x240 net/socket.c:2334 __do_sys_setsockopt net/socket.c:2343 [inline] __se_sys_setsockopt net/socket.c:2340 [inline] __x64_sys_setsockopt+0x66/0x80 net/socket.c:2340 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b value changed: 0x00000006 -> 0x00000005 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3101 Comm: syz-executor.1 Not tainted 6.7.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 ==================================================================