================================================================== BUG: KCSAN: data-race in batadv_tt_local_add / batadv_tt_local_add write to 0xffff8880a3f91cc0 of 8 bytes by task 12667 on cpu 0: batadv_tt_local_add+0x10b/0x1020 net/batman-adv/translation-table.c:671 batadv_interface_tx+0x398/0xae0 net/batman-adv/soft-interface.c:249 __netdev_start_xmit include/linux/netdevice.h:4420 [inline] netdev_start_xmit include/linux/netdevice.h:4434 [inline] xmit_one net/core/dev.c:3280 [inline] dev_hard_start_xmit+0xef/0x430 net/core/dev.c:3296 __dev_queue_xmit+0x14c9/0x1b60 net/core/dev.c:3873 dev_queue_xmit+0x21/0x30 net/core/dev.c:3906 neigh_hh_output include/net/neighbour.h:500 [inline] neigh_output include/net/neighbour.h:509 [inline] ip_finish_output2+0x83a/0xe40 net/ipv4/ip_output.c:228 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x23a/0x490 net/ipv4/ip_output.c:290 ip_finish_output+0x41/0x160 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_mc_output+0x143/0x620 net/ipv4/ip_output.c:417 dst_output include/net/dst.h:436 [inline] ip_local_out+0x74/0x90 net/ipv4/ip_output.c:125 ip_send_skb+0x35/0xb0 net/ipv4/ip_output.c:1555 udp_send_skb.isra.0+0x3ce/0x8c0 net/ipv4/udp.c:891 udp_sendmsg+0x1568/0x1900 net/ipv4/udp.c:1178 inet_sendmsg+0x6d/0x90 net/ipv4/af_inet.c:807 write to 0xffff8880a3f91cc0 of 8 bytes by task 12651 on cpu 1: batadv_tt_local_add+0x10b/0x1020 net/batman-adv/translation-table.c:671 batadv_interface_tx+0x398/0xae0 net/batman-adv/soft-interface.c:249 __netdev_start_xmit include/linux/netdevice.h:4420 [inline] netdev_start_xmit include/linux/netdevice.h:4434 [inline] xmit_one net/core/dev.c:3280 [inline] dev_hard_start_xmit+0xef/0x430 net/core/dev.c:3296 __dev_queue_xmit+0x14c9/0x1b60 net/core/dev.c:3873 dev_queue_xmit+0x21/0x30 net/core/dev.c:3906 neigh_hh_output include/net/neighbour.h:500 [inline] neigh_output include/net/neighbour.h:509 [inline] ip_finish_output2+0x83a/0xe40 net/ipv4/ip_output.c:228 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x23a/0x490 net/ipv4/ip_output.c:290 ip_finish_output+0x41/0x160 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_mc_output+0x143/0x620 net/ipv4/ip_output.c:417 dst_output include/net/dst.h:436 [inline] ip_local_out+0x74/0x90 net/ipv4/ip_output.c:125 ip_send_skb+0x35/0xb0 net/ipv4/ip_output.c:1555 udp_send_skb.isra.0+0x3ce/0x8c0 net/ipv4/udp.c:891 udp_sendmsg+0x1568/0x1900 net/ipv4/udp.c:1178 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 12651 Comm: syz-executor.5 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================