================================================================== BUG: KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc read-write to 0xffffffff884054dc of 4 bytes by task 4111 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/ipv4/netfilter/arp_tables.c:413 [inline] translate_table+0xc71/0x1090 net/ipv4/netfilter/arp_tables.c:578 do_replace net/ipv4/netfilter/arp_tables.c:985 [inline] do_arpt_set_ctl+0x876/0xa20 net/ipv4/netfilter/arp_tables.c:1429 nf_setsockopt+0x195/0x1b0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0xea/0x100 net/ipv4/ip_sockglue.c:1424 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 read to 0xffffffff884054dc of 4 bytes by task 2822 on cpu 1: pcpu_alloc+0x9aa/0x10d0 mm/percpu.c:1868 __alloc_percpu_gfp+0x26/0x30 mm/percpu.c:1930 __percpu_counter_init_many+0x3c/0x1f0 lib/percpu_counter.c:164 mm_init+0x59d/0x6d0 kernel/fork.c:1304 dup_mm kernel/fork.c:1685 [inline] copy_mm+0x11d/0x1040 kernel/fork.c:1737 copy_process+0xee1/0x1f80 kernel/fork.c:2390 kernel_clone+0x16a/0x570 kernel/fork.c:2797 __do_sys_clone kernel/fork.c:2940 [inline] __se_sys_clone kernel/fork.c:2924 [inline] __x64_sys_clone+0xe8/0x120 kernel/fork.c:2924 x64_sys_call+0x23cb/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:57 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: 0x00000016 -> 0x00000015 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2822 Comm: dhcpcd Not tainted 6.9.0-rc5-syzkaller-00296-g5eb4573ea63d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ==================================================================