==================================================================
BUG: KCSAN: data-race in prandom_seed / prandom_u32

read to 0xffff888237d28848 of 8 bytes by task 1820 on cpu 0:
 prandom_seed+0xbb/0x270 lib/random32.c:439
 __inet_insert_ifa+0x3a6/0x600 net/ipv4/devinet.c:540
 inet_rtm_newaddr+0x854/0xb40 net/ipv4/devinet.c:962
 rtnetlink_rcv_msg+0x74f/0x7e0 net/core/rtnetlink.c:5993
 netlink_rcv_skb+0x13e/0x240 net/netlink/af_netlink.c:2502
 rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:6011
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x58a/0x660 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x661/0x750 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 __sys_sendto+0x21e/0x2c0 net/socket.c:2040
 __do_sys_sendto net/socket.c:2052 [inline]
 __se_sys_sendto net/socket.c:2048 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:2048
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

write to 0xffff888237d28848 of 8 bytes by task 1907 on cpu 1:
 siprand_u32 lib/random32.c:372 [inline]
 prandom_u32+0x10e/0x190 lib/random32.c:387
 mld_ifc_start_work net/ipv6/mcast.c:1071 [inline]
 mld_ifc_work+0x6dd/0x800 net/ipv6/mcast.c:2656
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x7178d6f116926243 -> 0xb8c0571185bf62f5

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1907 Comm: kworker/1:4 Not tainted 5.18.0-rc7-syzkaller-00048-gf993aed406ea-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: mld mld_ifc_work
==================================================================