IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
==================================================================
BUG: KMSAN: uninit-value in prefetch_freepointer mm/slub.c:276 [inline]
BUG: KMSAN: uninit-value in slab_alloc_node mm/slub.c:2713 [inline]
BUG: KMSAN: uninit-value in __kmalloc_node+0xef3/0x1240 mm/slub.c:3823
CPU: 0 PID: 10896 Comm: syz-executor7 Not tainted 4.18.0-rc5+ #29
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+0x185/0x1e0 lib/dump_stack.c:113
 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:982
 __msan_warning+0x7d/0xe0 mm/kmsan/kmsan_instr.c:645
 prefetch_freepointer mm/slub.c:276 [inline]
 slab_alloc_node mm/slub.c:2713 [inline]
 __kmalloc_node+0xef3/0x1240 mm/slub.c:3823
 kmalloc_node include/linux/slab.h:555 [inline]
 kzalloc_node include/linux/slab.h:718 [inline]
 qdisc_alloc+0x14b/0xdb0 net/sched/sch_generic.c:820
 qdisc_create_dflt+0x127/0x3f0 net/sched/sch_generic.c:894
 mq_init+0x41c/0x9a0 net/sched/sch_mq.c:95
 qdisc_create_dflt net/sched/sch_generic.c:901 [inline]
 attach_default_qdiscs net/sched/sch_generic.c:1036 [inline]
 dev_activate+0x1327/0x1480 net/sched/sch_generic.c:1075
 __dev_open+0x762/0x860 net/core/dev.c:1402
 __dev_change_flags+0x449/0xbb0 net/core/dev.c:6991
 dev_change_flags+0xca/0x230 net/core/dev.c:7060
 do_setlink+0x1670/0x6090 net/core/rtnetlink.c:2376
 rtnl_group_changelink net/core/rtnetlink.c:2834 [inline]
 rtnl_newlink+0x21b7/0x3990 net/core/rtnetlink.c:2992
 rtnetlink_rcv_msg+0xa6f/0x15a0 net/core/rtnetlink.c:4662
 netlink_rcv_skb+0x394/0x640 net/netlink/af_netlink.c:2448
 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:4680
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0x16da/0x17b0 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0x10c4/0x13d0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:641 [inline]
 sock_sendmsg net/socket.c:651 [inline]
 ___sys_sendmsg+0xed9/0x1350 net/socket.c:2125
 __sys_sendmsg net/socket.c:2163 [inline]
 __do_sys_sendmsg net/socket.c:2172 [inline]
 __se_sys_sendmsg net/socket.c:2170 [inline]
 __x64_sys_sendmsg+0x3b0/0x520 net/socket.c:2170
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ab9
Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f1686c77c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1686c786d4 RCX: 0000000000455ab9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000019
RBP: 000000000072c140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c10e8 R14: 00000000004d1788 R15: 0000000000000004

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_internal_poison_shadow+0xc8/0x1d0 mm/kmsan/kmsan.c:181
 kmsan_kmalloc+0xa1/0x120 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:2720 [inline]
 __kmalloc_node_track_caller+0xb48/0x11d0 mm/slub.c:4353
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2cb/0x9e0 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:988 [inline]
 tcp_send_ack+0x18d/0x900 net/ipv4/tcp_output.c:3590
 __tcp_ack_snd_check net/ipv4/tcp_input.c:5113 [inline]
 tcp_rcv_established+0x2918/0x2b50 net/ipv4/tcp_input.c:5529
 tcp_v4_do_rcv+0x646/0xcf0 net/ipv4/tcp_ipv4.c:1518
 tcp_v4_rcv+0x6bc0/0x7220 net/ipv4/tcp_ipv4.c:1810
 ip_local_deliver_finish+0x851/0xf00 net/ipv4/ip_input.c:215
 NF_HOOK include/linux/netfilter.h:287 [inline]
 ip_local_deliver+0x455/0x510 net/ipv4/ip_input.c:256
 dst_input include/net/dst.h:450 [inline]
 ip_rcv_finish+0xa1b/0x1d10 net/ipv4/ip_input.c:396
 NF_HOOK include/linux/netfilter.h:287 [inline]
 ip_rcv+0x12d4/0x14f0 net/ipv4/ip_input.c:492
 __netif_receive_skb_core+0x4a7a/0x4fc0 net/core/dev.c:4628
 __netif_receive_skb net/core/dev.c:4693 [inline]
 netif_receive_skb_internal+0x475/0x660 net/core/dev.c:4767
 napi_skb_finish net/core/dev.c:5129 [inline]
 napi_gro_receive+0x6be/0xb90 net/core/dev.c:5160
 receive_buf+0x4fb4/0x7900 drivers/net/virtio_net.c:996
 virtnet_receive drivers/net/virtio_net.c:1252 [inline]
 virtnet_poll+0x903/0x1490 drivers/net/virtio_net.c:1334
 napi_poll net/core/dev.c:5771 [inline]
 net_rx_action+0x799/0x1ae0 net/core/dev.c:5837
 __do_softirq+0x55f/0x934 kernel/softirq.c:288
==================================================================