================================================================== BUG: KCSAN: data-race in prandom_seed / prandom_u32 write to 0xffff88813bd28508 of 8 bytes by task 38 on cpu 1: siprand_u32 lib/random32.c:372 [inline] prandom_u32+0xeb/0x1f0 lib/random32.c:387 prandom_u32_max include/linux/prandom.h:96 [inline] batadv_iv_ogm_emit_send_time net/batman-adv/bat_iv_ogm.c:283 [inline] batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:827 [inline] batadv_iv_ogm_schedule+0x476/0x7b0 net/batman-adv/bat_iv_ogm.c:869 batadv_iv_send_outstanding_bat_ogm_packet+0x453/0x4b0 net/batman-adv/bat_iv_ogm.c:1723 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275 worker_thread+0x616/0xa70 kernel/workqueue.c:2421 kthread+0x20b/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff88813bd28508 of 8 bytes by task 8364 on cpu 0: prandom_seed+0xc5/0x270 lib/random32.c:440 __inet_insert_ifa+0x370/0x5d0 net/ipv4/devinet.c:537 inet_rtm_newaddr+0x5b6/0xb10 net/ipv4/devinet.c:956 rtnetlink_rcv_msg+0x728/0x7c0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x13e/0x240 net/netlink/af_netlink.c:2502 rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:5571 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x5fc/0x6c0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x6f8/0x7c0 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] __sys_sendto+0x2a8/0x370 net/socket.c:1975 __do_sys_sendto net/socket.c:1987 [inline] __se_sys_sendto net/socket.c:1983 [inline] __x64_sys_sendto+0x74/0x90 net/socket.c:1983 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 8364 Comm: syz-executor.1 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================