================================================================== BUG: KCSAN: data-race in __xfrm_policy_check / __xfrm_policy_check write to 0xffff88812ac10508 of 8 bytes by interrupt on cpu 1: __xfrm_policy_check+0x3ce/0x13e0 net/xfrm/xfrm_policy.c:3585 __xfrm_policy_check2 include/net/xfrm.h:1101 [inline] xfrm_policy_check include/net/xfrm.h:1106 [inline] xfrm6_policy_check include/net/xfrm.h:1116 [inline] tcp_v6_rcv+0x1a39/0x1ac0 net/ipv6/tcp_ipv6.c:1583 ip6_protocol_deliver_rcu+0x22a/0xbe0 net/ipv6/ip6_input.c:409 ip6_input_finish+0x30/0x50 net/ipv6/ip6_input.c:450 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip6_input+0x177/0x190 net/ipv6/ip6_input.c:459 dst_input include/net/dst.h:442 [inline] ip6_rcv_finish+0x110/0x140 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ipv6_rcv+0x1a1/0x1b0 net/ipv6/ip6_input.c:284 __netif_receive_skb_one_core+0xa7/0xe0 net/core/dev.c:4929 __netif_receive_skb+0x37/0xf0 net/core/dev.c:5043 process_backlog+0x207/0x4b0 net/core/dev.c:5874 napi_poll net/core/dev.c:6311 [inline] net_rx_action+0x3ae/0xa90 net/core/dev.c:6379 __do_softirq+0x115/0x33f kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.0+0x6b/0x80 kernel/softirq.c:337 do_softirq kernel/softirq.c:329 [inline] __local_bh_enable_ip+0x76/0x80 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:688 [inline] ip6_finish_output2+0x7bb/0xec0 net/ipv6/ip6_output.c:117 __ip6_finish_output net/ipv6/ip6_output.c:142 [inline] __ip6_finish_output+0x2d7/0x330 net/ipv6/ip6_output.c:127 ip6_finish_output+0x41/0x160 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0xf2/0x280 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip6_xmit+0x6cb/0xcd0 net/ipv6/ip6_output.c:279 inet6_csk_xmit+0x170/0x1f0 net/ipv6/inet6_connection_sock.c:135 __tcp_transmit_skb+0xe81/0x1d60 net/ipv4/tcp_output.c:1169 tcp_transmit_skb net/ipv4/tcp_output.c:1185 [inline] tcp_write_xmit+0xa54/0x3120 net/ipv4/tcp_output.c:2440 tcp_push_one+0x95/0xb0 net/ipv4/tcp_output.c:2630 tcp_sendmsg_locked+0x11aa/0x1fb0 net/ipv4/tcp.c:1385 tcp_sendmsg+0x39/0x60 net/ipv4/tcp.c:1436 inet6_sendmsg+0x6d/0x90 net/ipv6/af_inet6.c:576 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0x9f/0xc0 net/socket.c:657 __sys_sendto+0x21f/0x320 net/socket.c:1952 __do_sys_sendto net/socket.c:1964 [inline] __se_sys_sendto net/socket.c:1960 [inline] __x64_sys_sendto+0x89/0xb0 net/socket.c:1960 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff88812ac10508 of 8 bytes by interrupt on cpu 0: __xfrm_policy_check+0x3ce/0x13e0 net/xfrm/xfrm_policy.c:3585 __xfrm_policy_check2 include/net/xfrm.h:1101 [inline] xfrm_policy_check include/net/xfrm.h:1106 [inline] xfrm6_policy_check include/net/xfrm.h:1116 [inline] tcp_v6_rcv+0x1a39/0x1ac0 net/ipv6/tcp_ipv6.c:1583 ip6_protocol_deliver_rcu+0x22a/0xbe0 net/ipv6/ip6_input.c:409 ip6_input_finish+0x30/0x50 net/ipv6/ip6_input.c:450 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip6_input+0x177/0x190 net/ipv6/ip6_input.c:459 dst_input include/net/dst.h:442 [inline] ip6_rcv_finish+0x110/0x140 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ipv6_rcv+0x1a1/0x1b0 net/ipv6/ip6_input.c:284 __netif_receive_skb_one_core+0xa7/0xe0 net/core/dev.c:4929 __netif_receive_skb+0x37/0xf0 net/core/dev.c:5043 process_backlog+0x207/0x4b0 net/core/dev.c:5874 napi_poll net/core/dev.c:6311 [inline] net_rx_action+0x3ae/0xa90 net/core/dev.c:6379 __do_softirq+0x115/0x33f kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.0+0x6b/0x80 kernel/softirq.c:337 do_softirq kernel/softirq.c:329 [inline] __local_bh_enable_ip+0x76/0x80 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:688 [inline] ip6_finish_output2+0x7bb/0xec0 net/ipv6/ip6_output.c:117 __ip6_finish_output net/ipv6/ip6_output.c:142 [inline] __ip6_finish_output+0x2d7/0x330 net/ipv6/ip6_output.c:127 ip6_finish_output+0x41/0x160 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0xf2/0x280 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip6_xmit+0x6cb/0xcd0 net/ipv6/ip6_output.c:279 inet6_csk_xmit+0x170/0x1f0 net/ipv6/inet6_connection_sock.c:135 __tcp_transmit_skb+0xe81/0x1d60 net/ipv4/tcp_output.c:1169 __tcp_send_ack+0x246/0x300 net/ipv4/tcp_output.c:3696 tcp_send_ack+0x34/0x40 net/ipv4/tcp_output.c:3702 tcp_cleanup_rbuf+0x130/0x360 net/ipv4/tcp.c:1578 tcp_recvmsg+0x57c/0x1b40 net/ipv4/tcp.c:2091 inet6_recvmsg+0xbb/0x240 net/ipv6/af_inet6.c:592 sock_recvmsg_nosec net/socket.c:871 [inline] sock_recvmsg net/socket.c:889 [inline] sock_recvmsg+0x92/0xb0 net/socket.c:885 __sys_recvfrom+0x1ae/0x2d0 net/socket.c:2009 __do_sys_recvfrom net/socket.c:2027 [inline] __se_sys_recvfrom net/socket.c:2023 [inline] __x64_sys_recvfrom+0x89/0xb0 net/socket.c:2023 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 13897 Comm: syz-executor.0 Not tainted 5.4.0-rc6+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================