================================================================== BUG: KMSAN: uninit-value in memcmp+0x117/0x180 lib/string.c:865 CPU: 1 PID: 42 Comm: kworker/1:1 Not tainted 5.1.0-rc2+ #24 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x173/0x1d0 lib/dump_stack.c:113 kmsan_report+0x131/0x2a0 mm/kmsan/kmsan.c:619 __msan_warning+0x7a/0xf0 mm/kmsan/kmsan_instr.c:310 memcmp+0x117/0x180 lib/string.c:865 __hw_addr_add_ex net/core/dev_addr_lists.c:61 [inline] __dev_mc_add+0x215/0x8e0 net/core/dev_addr_lists.c:770 dev_mc_add+0x6d/0x80 net/core/dev_addr_lists.c:787 igmp6_group_added+0x2d4/0xad0 net/ipv6/mcast.c:676 __ipv6_dev_mc_inc+0xdc7/0xfa0 net/ipv6/mcast.c:934 ipv6_dev_mc_inc+0x70/0x80 net/ipv6/mcast.c:941 addrconf_join_solict net/ipv6/addrconf.c:2151 [inline] addrconf_dad_begin net/ipv6/addrconf.c:3936 [inline] addrconf_dad_work+0x50c/0x26e0 net/ipv6/addrconf.c:4063 process_one_work+0x1607/0x2010 kernel/workqueue.c:2269 worker_thread+0x111c/0x2460 kernel/workqueue.c:2415 kthread+0x4a1/0x4e0 kernel/kthread.c:254 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 Local variable description: ----buf@igmp6_group_added Variable was created at: igmp6_group_added+0x57/0xad0 net/ipv6/mcast.c:664 __ipv6_dev_mc_inc+0xdc7/0xfa0 net/ipv6/mcast.c:934 ==================================================================