=====================================================
BUG: KMSAN: uninit-value in ip_tunnel_xmit+0x501/0x3dc0 net/ipv4/ip_tunnel.c:658
 ip_tunnel_xmit+0x501/0x3dc0 net/ipv4/ip_tunnel.c:658
 __gre_xmit net/ipv4/ip_gre.c:471 [inline]
 ipgre_xmit+0x127e/0x1310 net/ipv4/ip_gre.c:659
 __netdev_start_xmit include/linux/netdevice.h:4778 [inline]
 netdev_start_xmit include/linux/netdevice.h:4792 [inline]
 xmit_one+0x2f4/0x840 net/core/dev.c:3532
 dev_hard_start_xmit+0x186/0x440 net/core/dev.c:3548
 __dev_queue_xmit+0x22ee/0x3500 net/core/dev.c:4176
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4209
 garp_queue_xmit net/802/garp.c:272 [inline]
 garp_join_timer+0x1e0/0x340 net/802/garp.c:423
 call_timer_fn+0x81/0x540 kernel/time/timer.c:1421
 expire_timers+0x2f5/0x6d0 kernel/time/timer.c:1466
 __run_timers+0x682/0xa80 kernel/time/timer.c:1737
 run_timer_softirq+0x71/0xe0 kernel/time/timer.c:1750
 __do_softirq+0x1ee/0x7c5 kernel/softirq.c:558
 invoke_softirq+0xa4/0x130 kernel/softirq.c:432
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0x76/0x130 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x9a/0xc0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20
 console_unlock+0x1b25/0x2130 kernel/printk/printk.c:2779
 vprintk_emit+0x445/0xab0 kernel/printk/printk.c:2272
 vprintk_default+0x86/0xa0 kernel/printk/printk.c:2283
 vprintk+0x15f/0x180 kernel/printk/printk_safe.c:50
 _printk+0x18d/0x1cf kernel/printk/printk.c:2293
 __dev_set_promiscuity+0x4fb/0xbf0 net/core/dev.c:8225
 __dev_change_flags+0x90f/0xd40 net/core/dev.c:8442
 rtnl_configure_link net/core/rtnetlink.c:3152 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3491 [inline]
 rtnl_newlink+0x352f/0x4220 net/core/rtnetlink.c:3531
 rtnetlink_rcv_msg+0x148d/0x18d0 net/core/rtnetlink.c:5993
 netlink_rcv_skb+0x40c/0x7e0 net/netlink/af_netlink.c:2503
 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:6011
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x109c/0x1370 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x14dc/0x1720 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2413
 ___sys_sendmsg net/socket.c:2467 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2496
 __do_sys_sendmsg net/socket.c:2505 [inline]
 __se_sys_sendmsg net/socket.c:2503 [inline]
 __x64_sys_sendmsg+0xe2/0x120 net/socket.c:2503
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:754 [inline]
 slab_alloc_node mm/slub.c:3231 [inline]
 __kmalloc_node_track_caller+0xde3/0x14f0 mm/slub.c:4962
 kmalloc_reserve net/core/skbuff.c:354 [inline]
 pskb_expand_head+0x26d/0x1fd0 net/core/skbuff.c:1700
 __skb_cow include/linux/skbuff.h:3476 [inline]
 skb_cow_head include/linux/skbuff.h:3510 [inline]
 ipgre_xmit+0xb01/0x1310 net/ipv4/ip_gre.c:636
 __netdev_start_xmit include/linux/netdevice.h:4778 [inline]
 netdev_start_xmit include/linux/netdevice.h:4792 [inline]
 xmit_one+0x2f4/0x840 net/core/dev.c:3532
 dev_hard_start_xmit+0x186/0x440 net/core/dev.c:3548
 __dev_queue_xmit+0x22ee/0x3500 net/core/dev.c:4176
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4209
 garp_queue_xmit net/802/garp.c:272 [inline]
 garp_join_timer+0x1e0/0x340 net/802/garp.c:423
 call_timer_fn+0x81/0x540 kernel/time/timer.c:1421
 expire_timers+0x2f5/0x6d0 kernel/time/timer.c:1466
 __run_timers+0x682/0xa80 kernel/time/timer.c:1737
 run_timer_softirq+0x71/0xe0 kernel/time/timer.c:1750
 __do_softirq+0x1ee/0x7c5 kernel/softirq.c:558

CPU: 0 PID: 6211 Comm: syz-executor.1 Not tainted 5.18.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================