================================================================== BUG: KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc read-write to 0xffffffff883da4dc of 4 bytes by task 17971 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 do_replace net/ipv6/netfilter/ip6_tables.c:1150 [inline] do_ip6t_set_ctl+0x14bf/0x1800 net/ipv6/netfilter/ip6_tables.c:1636 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:3735 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 do_syscall_64+0xd3/0x1d0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 read to 0xffffffff883da4dc of 4 bytes by task 19452 on cpu 1: pcpu_alloc+0x9aa/0x10d0 mm/percpu.c:1868 __alloc_percpu_gfp+0x26/0x30 mm/percpu.c:1930 bpf_map_alloc_percpu+0xab/0x200 kernel/bpf/syscall.c:466 prealloc_init+0x19f/0x470 kernel/bpf/hashtab.c:338 htab_map_alloc+0x637/0x8f0 kernel/bpf/hashtab.c:573 map_create+0x83c/0xb90 kernel/bpf/syscall.c:1320 __sys_bpf+0x667/0x7a0 kernel/bpf/syscall.c:5613 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline] __se_sys_bpf kernel/bpf/syscall.c:5736 [inline] __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5736 do_syscall_64+0xd3/0x1d0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 value changed: 0x00000028 -> 0x00000027 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 19452 Comm: syz-executor.3 Not tainted 6.9.0-rc1-syzkaller-00061-g8d025e2092e2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 ==================================================================