================================================================== BUG: KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc read-write to 0xffffffff884054dc of 4 bytes by task 18421 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+0x4b3/0x10d0 mm/percpu.c:1808 __alloc_percpu+0x24/0x30 mm/percpu.c:1943 xt_percpu_counter_alloc+0x72/0x110 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_security_table_init+0x4e/0x70 net/ipv6/netfilter/ip6table_security.c:45 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:1494 tcp_getsockopt+0xaa/0xe0 net/ipv4/tcp.c:4375 sock_common_getsockopt+0x5b/0x70 net/core/sock.c:3700 do_sock_getsockopt+0x121/0x1a0 net/socket.c:2373 __sys_getsockopt+0x19a/0x210 net/socket.c:2402 __do_sys_getsockopt net/socket.c:2412 [inline] __se_sys_getsockopt net/socket.c:2409 [inline] __x64_sys_getsockopt+0x66/0x80 net/socket.c:2409 x64_sys_call+0x2ce9/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:56 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff884054dc of 4 bytes by task 17279 on cpu 1: pcpu_alloc+0x9aa/0x10d0 mm/percpu.c:1868 __alloc_percpu+0x24/0x30 mm/percpu.c:1943 xt_percpu_counter_alloc+0x72/0x110 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 do_replace net/ipv6/netfilter/ip6_tables.c:1154 [inline] do_ip6t_set_ctl+0x7cc/0x8c0 net/ipv6/netfilter/ip6_tables.c:1644 nf_setsockopt+0x195/0x1b0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x126/0x140 net/ipv6/ipv6_sockglue.c:999 tcp_setsockopt+0x93/0xb0 net/ipv4/tcp.c:3737 sock_common_setsockopt+0x64/0x80 net/core/sock.c:3727 do_sock_setsockopt net/socket.c:2311 [inline] __sys_setsockopt+0x1d8/0x250 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 x64_sys_call+0x1159/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:55 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000001 -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 17279 Comm: syz-executor.4 Tainted: G W 6.9.0-rc6-syzkaller-00113-g49a73b1652c5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ==================================================================