=====================================================
BUG: KMSAN: uninit-value in __ipv6_dev_mc_inc+0x65a/0x1620 net/ipv6/mcast.c:927
 __ipv6_dev_mc_inc+0x65a/0x1620 net/ipv6/mcast.c:927
 ipv6_dev_mc_inc+0x70/0x80 net/ipv6/mcast.c:957
 addrconf_join_solict net/ipv6/addrconf.c:2179 [inline]
 addrconf_dad_begin net/ipv6/addrconf.c:3958 [inline]
 addrconf_dad_work+0x736/0x2210 net/ipv6/addrconf.c:4085
 process_one_work+0xdb9/0x1820 kernel/workqueue.c:2298
 worker_thread+0x10bc/0x21f0 kernel/workqueue.c:2445
 kthread+0x721/0x850 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

Local variable maddr.i.i created at:
 addrconf_join_solict net/ipv6/addrconf.c:2173 [inline]
 addrconf_dad_begin net/ipv6/addrconf.c:3958 [inline]
 addrconf_dad_work+0x32c/0x2210 net/ipv6/addrconf.c:4085
 process_one_work+0xdb9/0x1820 kernel/workqueue.c:2298

CPU: 1 PID: 3567 Comm: kworker/1:4 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
=====================================================