===================================================== BUG: KMSAN: uninit-value in ip_tunnel_xmit+0x476/0x3610 net/ipv4/ip_tunnel.c:658 ip_tunnel_xmit+0x476/0x3610 net/ipv4/ip_tunnel.c:658 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0xd62/0xe70 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4805 [inline] netdev_start_xmit include/linux/netdevice.h:4819 [inline] xmit_one+0x14e/0x5f0 net/core/dev.c:3590 dev_hard_start_xmit+0xe5/0x370 net/core/dev.c:3606 __dev_queue_xmit+0x1dec/0x31f0 net/core/dev.c:4255 dev_queue_xmit+0x2b/0x30 include/linux/netdevice.h:2994 packet_snd net/packet/af_packet.c:3073 [inline] packet_sendmsg+0x6385/0x7830 net/packet/af_packet.c:3104 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] __sys_sendto+0x7ea/0xa60 net/socket.c:2119 __do_sys_sendto net/socket.c:2131 [inline] __se_sys_sendto net/socket.c:2127 [inline] __ia32_sys_sendto+0x11b/0x1b0 net/socket.c:2127 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x95/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x53/0x62 Uninit was created at: slab_post_alloc_hook mm/slab.h:755 [inline] slab_alloc_node mm/slub.c:3258 [inline] __kmalloc_node_track_caller+0x86c/0x1230 mm/slub.c:4995 kmalloc_reserve net/core/skbuff.c:354 [inline] pskb_expand_head+0x1aa/0x1a00 net/core/skbuff.c:1695 __skb_cow include/linux/skbuff.h:3633 [inline] skb_cow_head include/linux/skbuff.h:3667 [inline] ipgre_xmit+0x750/0xe70 net/ipv4/ip_gre.c:637 __netdev_start_xmit include/linux/netdevice.h:4805 [inline] netdev_start_xmit include/linux/netdevice.h:4819 [inline] xmit_one+0x14e/0x5f0 net/core/dev.c:3590 dev_hard_start_xmit+0xe5/0x370 net/core/dev.c:3606 __dev_queue_xmit+0x1dec/0x31f0 net/core/dev.c:4255 dev_queue_xmit+0x2b/0x30 include/linux/netdevice.h:2994 packet_snd net/packet/af_packet.c:3073 [inline] packet_sendmsg+0x6385/0x7830 net/packet/af_packet.c:3104 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] __sys_sendto+0x7ea/0xa60 net/socket.c:2119 __do_sys_sendto net/socket.c:2131 [inline] __se_sys_sendto net/socket.c:2127 [inline] __ia32_sys_sendto+0x11b/0x1b0 net/socket.c:2127 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x95/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x53/0x62 CPU: 1 PID: 12138 Comm: syz-executor.3 Not tainted 5.19.0-rc4-syzkaller-31333-g97117d69c353 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 =====================================================