================================================================== BUG: KMSAN: uninit-value in gue_err+0x482/0xb00 net/ipv4/fou.c:1031 CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.0.0-rc1+ #9 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+0x173/0x1d0 lib/dump_stack.c:113 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:600 __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313 gue_err+0x482/0xb00 net/ipv4/fou.c:1031 __udp4_lib_err_encap_no_sk net/ipv4/udp.c:569 [inline] __udp4_lib_err_encap net/ipv4/udp.c:624 [inline] __udp4_lib_err+0x12e6/0x1d40 net/ipv4/udp.c:663 udp_err+0x74/0x90 net/ipv4/udp.c:735 icmp_socket_deliver net/ipv4/icmp.c:766 [inline] icmp_unreach+0xb65/0x1070 net/ipv4/icmp.c:883 icmp_rcv+0x11a1/0x1950 net/ipv4/icmp.c:1065 ip_protocol_deliver_rcu+0x584/0xba0 net/ipv4/ip_input.c:208 ip_local_deliver_finish net/ipv4/ip_input.c:234 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] ip_local_deliver+0x624/0x7b0 net/ipv4/ip_input.c:255 dst_input include/net/dst.h:450 [inline] ip_rcv_finish net/ipv4/ip_input.c:414 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] ip_rcv+0x6b6/0x740 net/ipv4/ip_input.c:523 __netif_receive_skb_one_core net/core/dev.c:4973 [inline] __netif_receive_skb net/core/dev.c:5083 [inline] process_backlog+0x756/0x10e0 net/core/dev.c:5923 napi_poll net/core/dev.c:6346 [inline] net_rx_action+0x78b/0x1a60 net/core/dev.c:6412 __do_softirq+0x53f/0x93a kernel/softirq.c:293 run_ksoftirqd+0x26/0x50 kernel/softirq.c:658 smpboot_thread_fn+0x4d0/0x9f0 kernel/smpboot.c:164 kthread+0x4a1/0x4e0 kernel/kthread.c:247 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:159 kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:176 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:185 slab_post_alloc_hook mm/slab.h:446 [inline] slab_alloc_node mm/slub.c:2754 [inline] __kmalloc_node_track_caller+0xe9e/0xff0 mm/slub.c:4377 __kmalloc_reserve net/core/skbuff.c:140 [inline] pskb_expand_head+0x220/0x18f0 net/core/skbuff.c:1465 __pskb_pull_tail+0x1a7/0x2230 net/core/skbuff.c:1896 skb_make_writable+0x3e4/0x4c0 net/netfilter/core.c:556 nf_nat_icmp_reply_translation+0x212/0x990 net/ipv4/netfilter/nf_nat_l3proto_ipv4.c:178 nf_nat_ipv4_fn net/ipv4/netfilter/nf_nat_l3proto_ipv4.c:238 [inline] nf_nat_ipv4_in+0x2ad/0x590 net/ipv4/netfilter/nf_nat_l3proto_ipv4.c:256 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0x176/0x3d0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:244 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] ip_rcv+0x256/0x740 net/ipv4/ip_input.c:523 __netif_receive_skb_one_core net/core/dev.c:4973 [inline] __netif_receive_skb net/core/dev.c:5083 [inline] process_backlog+0x756/0x10e0 net/core/dev.c:5923 napi_poll net/core/dev.c:6346 [inline] net_rx_action+0x78b/0x1a60 net/core/dev.c:6412 __do_softirq+0x53f/0x93a kernel/softirq.c:293 ==================================================================