=====================================================
BUG: KMSAN: uninit-value in decode_session6 net/xfrm/xfrm_policy.c:3468 [inline]
BUG: KMSAN: uninit-value in __xfrm_decode_session+0x880/0x2890 net/xfrm/xfrm_policy.c:3557
 decode_session6 net/xfrm/xfrm_policy.c:3468 [inline]
 __xfrm_decode_session+0x880/0x2890 net/xfrm/xfrm_policy.c:3557
 xfrm_decode_session_reverse include/net/xfrm.h:1222 [inline]
 icmpv6_route_lookup+0x68b/0xa70 net/ipv6/icmp.c:388
 icmp6_send+0x21b6/0x2970 net/ipv6/icmp.c:592
 __icmpv6_send include/linux/icmpv6.h:28 [inline]
 icmpv6_send include/linux/icmpv6.h:49 [inline]
 ip6_link_failure+0x40/0x320 net/ipv6/route.c:2785
 dst_link_failure include/net/dst.h:437 [inline]
 ip6_tnl_xmit+0x22dc/0x3760 net/ipv6/ip6_tunnel.c:1268
 ipxip6_tnl_xmit net/ipv6/ip6_tunnel.c:1384 [inline]
 ip6_tnl_start_xmit+0x1851/0x1a70 net/ipv6/ip6_tunnel.c:1432
 __netdev_start_xmit include/linux/netdevice.h:4915 [inline]
 netdev_start_xmit include/linux/netdevice.h:4929 [inline]
 xmit_one net/core/dev.c:3578 [inline]
 dev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3594
 sch_direct_xmit+0x3c5/0xd40 net/sched/sch_generic.c:342
 qdisc_restart net/sched/sch_generic.c:407 [inline]
 __qdisc_run+0x14ab/0x35a0 net/sched/sch_generic.c:415
 __dev_xmit_skb net/core/dev.c:3868 [inline]
 __dev_queue_xmit+0x1b43/0x50f0 net/core/dev.c:4210
 dev_queue_xmit include/linux/netdevice.h:3085 [inline]
 neigh_connected_output+0x569/0x660 net/core/neighbour.c:1581
 neigh_output include/net/neighbour.h:544 [inline]
 ip6_finish_output2+0x2179/0x28e0 net/ipv6/ip6_output.c:134
 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
 ip6_finish_output+0xa10/0x1240 net/ipv6/ip6_output.c:206
 NF_HOOK_COND include/linux/netfilter.h:292 [inline]
 ip6_output+0x323/0x610 net/ipv6/ip6_output.c:227
 dst_output include/net/dst.h:458 [inline]
 ip6_local_out+0xe9/0x140 net/ipv6/output_core.c:155
 ip6_send_skb net/ipv6/ip6_output.c:1989 [inline]
 ip6_push_pending_frames+0x1f9/0x560 net/ipv6/ip6_output.c:2009
 rawv6_push_pending_frames+0xbe8/0xdf0 net/ipv6/raw.c:582
 rawv6_sendmsg+0x28a8/0x2b80 net/ipv6/raw.c:925
 inet_sendmsg+0x105/0x190 net/ipv4/af_inet.c:825
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg net/socket.c:747 [inline]
 ____sys_sendmsg+0x999/0xd50 net/socket.c:2503
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2557
 __sys_sendmsg net/socket.c:2586 [inline]
 __do_sys_sendmsg net/socket.c:2595 [inline]
 __se_sys_sendmsg net/socket.c:2593 [inline]
 __x64_sys_sendmsg+0x304/0x490 net/socket.c:2593
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Uninit was created at:
 slab_post_alloc_hook+0x12d/0xb60 mm/slab.h:716
 slab_alloc_node mm/slub.c:3451 [inline]
 kmem_cache_alloc_node+0x535/0xa30 mm/slub.c:3496
 kmalloc_reserve+0x148/0x470 net/core/skbuff.c:568
 __alloc_skb+0x318/0x740 net/core/skbuff.c:654
 alloc_skb include/linux/skbuff.h:1288 [inline]
 alloc_uevent_skb+0xdb/0x340 lib/kobject_uevent.c:290
 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline]
 kobject_uevent_net_broadcast+0x678/0xd50 lib/kobject_uevent.c:409
 kobject_uevent_env+0xd3b/0x1240 lib/kobject_uevent.c:593
 kobject_synth_uevent+0xcb7/0x1a40 lib/kobject_uevent.c:208
 uevent_store+0x48/0x110 drivers/base/core.c:2663
 dev_attr_store+0x70/0xc0 drivers/base/core.c:2365
 sysfs_kf_write+0x197/0x250 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x51f/0x910 fs/kernfs/file.c:334
 call_write_iter include/linux/fs.h:1868 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x8f9/0x1490 fs/read_write.c:584
 ksys_write+0x20f/0x4c0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x93/0xd0 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

CPU: 1 PID: 16796 Comm: syz-executor.1 Not tainted 6.4.0-rc3-syzkaller-gf93f2feda5d6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/16/2023
=====================================================