=====================================================
BUG: KMSAN: uninit-value in check_pointer lib/vsprintf.c:705 [inline]
BUG: KMSAN: uninit-value in va_format lib/vsprintf.c:1690 [inline]
BUG: KMSAN: uninit-value in pointer+0x1700/0x2060 lib/vsprintf.c:2427
 check_pointer lib/vsprintf.c:705 [inline]
 va_format lib/vsprintf.c:1690 [inline]
 pointer+0x1700/0x2060 lib/vsprintf.c:2427
 vsnprintf+0x1aaf/0x36a0 lib/vsprintf.c:2801
 vprintk_store+0x4c4/0x20d0 kernel/printk/printk.c:2134
 vprintk_emit+0x25c/0x860 kernel/printk/printk.c:2228
 dev_vprintk_emit+0x5f5/0x6d6 drivers/base/core.c:4596
 dev_printk_emit+0x1d8/0x21a drivers/base/core.c:4607
 __netdev_printk+0x7eb/0xb00 net/core/dev.c:11417
 netdev_info+0x1e5/0x22a net/core/dev.c:11472
 nsim_udp_tunnel_unset_port+0x57a/0x620 drivers/net/netdevsim/udp_tunnels.c:64
 udp_tunnel_nic_device_sync_by_port net/ipv4/udp_tunnel_nic.c:246 [inline]
 __udp_tunnel_nic_device_sync+0x10ec/0x1f70 net/ipv4/udp_tunnel_nic.c:289
 udp_tunnel_nic_device_sync net/ipv4/udp_tunnel_nic.c:312 [inline]
 __udp_tunnel_nic_del_port+0x634/0x7b0 net/ipv4/udp_tunnel_nic.c:548
 udp_tunnel_nic_del_port include/net/udp_tunnel.h:341 [inline]
 udp_tunnel_notify_del_rx_port+0x2d2/0x450 net/ipv4/udp_tunnel_core.c:149
 __vxlan_sock_release_prep+0x465/0x530 drivers/net/vxlan.c:1583
 vxlan_sock_release+0x53b/0x6f0 drivers/net/vxlan.c:1606
 vxlan_stop+0x1681/0x1780 drivers/net/vxlan.c:3146
 __dev_close_many+0x637/0x850 net/core/dev.c:1568
 dev_close_many+0x45f/0xb60 net/core/dev.c:1593
 unregister_netdevice_many+0x8ea/0x31f0 net/core/dev.c:11027
 __rtnl_newlink net/core/rtnetlink.c:3489 [inline]
 rtnl_newlink+0x40eb/0x4440 net/core/rtnetlink.c:3506
 rtnetlink_rcv_msg+0x1449/0x18b0 net/core/rtnetlink.c:5572
 netlink_rcv_skb+0x447/0x800 net/netlink/af_netlink.c:2510
 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5590
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x107b/0x1350 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x1717/0x18a0 net/netlink/af_netlink.c:1935
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2409
 ___sys_sendmsg net/socket.c:2463 [inline]
 __sys_sendmmsg+0x836/0xf50 net/socket.c:2542
 __compat_sys_sendmmsg net/compat.c:361 [inline]
 __do_compat_sys_sendmmsg net/compat.c:368 [inline]
 __se_compat_sys_sendmmsg net/compat.c:365 [inline]
 __ia32_compat_sys_sendmmsg+0x127/0x180 net/compat.c:365
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Local variable sample.i created at:
 perf_log_itrace_start kernel/events/core.c:9069 [inline]
 event_sched_in+0x13d1/0x33e0 kernel/events/core.c:2557
 group_sched_in kernel/events/core.c:2595 [inline]
 merge_sched_in kernel/events/core.c:3746 [inline]
 visit_groups_merge+0x28a8/0x7320 kernel/events/core.c:3696
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