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BUG: KMSAN: uninit-value in slab_alloc_node mm/slub.c:2704 [inline]
BUG: KMSAN: uninit-value in __kmalloc_node_track_caller+0x667/0x1160 mm/slub.c:4352
CPU: 1 PID: 6734 Comm: syz-executor6 Not tainted 4.19.0-rc1+ #37
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x14b/0x190 lib/dump_stack.c:113
 kmsan_report+0x183/0x2b0 mm/kmsan/kmsan.c:956
 __msan_warning+0x70/0xc0 mm/kmsan/kmsan_instr.c:645
 slab_alloc_node mm/slub.c:2704 [inline]
 __kmalloc_node_track_caller+0x667/0x1160 mm/slub.c:4352
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 pskb_expand_head+0x231/0x19c0 net/core/skbuff.c:1464
 netlink_trim+0x398/0x400 net/netlink/af_netlink.c:1299
 netlink_broadcast_filtered+0x1bd/0x1e20 net/netlink/af_netlink.c:1496
 netlink_broadcast net/netlink/af_netlink.c:1541 [inline]
 nlmsg_multicast include/net/netlink.h:591 [inline]
 nlmsg_notify+0x1dd/0x3d0 net/netlink/af_netlink.c:2497
 rtnl_notify net/core/rtnetlink.c:732 [inline]
 rtmsg_ifinfo_send net/core/rtnetlink.c:3334 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:3349 [inline]
 rtmsg_ifinfo+0x1e9/0x260 net/core/rtnetlink.c:3355
 netdev_state_change+0x1dd/0x2c0 net/core/dev.c:1341
 do_setlink+0x1867/0x6080 net/core/rtnetlink.c:2634
 rtnl_group_changelink net/core/rtnetlink.c:2883 [inline]
 rtnl_newlink+0x2257/0x39e0 net/core/rtnetlink.c:3041
 rtnetlink_rcv_msg+0xa0b/0x1530 net/core/rtnetlink.c:4711
 netlink_rcv_skb+0x36e/0x5f0 net/netlink/af_netlink.c:2454
 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:4729
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x1638/0x1720 net/netlink/af_netlink.c:1343
 netlink_sendmsg+0x1205/0x1290 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xe70/0x1290 net/socket.c:2114
 __sys_sendmsg net/socket.c:2152 [inline]
 __do_sys_sendmsg net/socket.c:2161 [inline]
 __se_sys_sendmsg net/socket.c:2159 [inline]
 __x64_sys_sendmsg+0x32d/0x460 net/socket.c:2159
 do_syscall_64+0x15b/0x220 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457089
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f29774a0c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f29774a16d4 RCX: 0000000000457089
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000005
RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d45a0 R14: 00000000004c8d71 R15: 0000000000000001

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:181
 kmsan_kmalloc+0x98/0x100 mm/kmsan/kmsan_hooks.c:91
 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:100
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2719 [inline]
 __kmalloc_node_track_caller+0x9e7/0x1160 mm/slub.c:4352
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2f5/0x9e0 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:996 [inline]
 alloc_skb_with_frags+0x1d0/0xac0 net/core/skbuff.c:5276
 sock_alloc_send_pskb+0xb47/0x1170 net/core/sock.c:2082
 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2099
 mld_newpack+0x295/0xd20 net/ipv6/mcast.c:1610
 add_grhead net/ipv6/mcast.c:1714 [inline]
 add_grec+0x1e40/0x22c0 net/ipv6/mcast.c:1845
 mld_send_cr net/ipv6/mcast.c:1971 [inline]
 mld_ifc_timer_expire+0x1007/0x17b0 net/ipv6/mcast.c:2478
 call_timer_fn+0x270/0x5b0 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xd94/0x11a0 kernel/time/timer.c:1682
 run_timer_softirq+0x2e/0x50 kernel/time/timer.c:1695
 __do_softirq+0x562/0x948 kernel/softirq.c:292
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