===================================================== BUG: KMSAN: uninit-value in __skb_checksum_complete+0x425/0x630 net/core/skbuff.c:2850 CPU: 1 PID: 8705 Comm: kworker/u4:2 Not tainted 5.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 __skb_checksum_complete+0x425/0x630 net/core/skbuff.c:2850 nf_ip6_checksum+0x565/0x670 net/netfilter/utils.c:91 nf_nat_icmpv6_reply_translation+0x312/0x1360 net/netfilter/nf_nat_proto.c:800 nf_nat_ipv6_fn+0x3c4/0x570 net/netfilter/nf_nat_proto.c:873 nf_nat_ipv6_local_fn+0xaa/0x800 net/netfilter/nf_nat_proto.c:946 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0x17b/0x460 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:262 [inline] __ip6_local_out+0x696/0x7c0 net/ipv6/output_core.c:167 ip6_local_out+0xa1/0x1e0 net/ipv6/output_core.c:177 ip6_send_skb net/ipv6/ip6_output.c:1865 [inline] ip6_push_pending_frames+0x252/0x5b0 net/ipv6/ip6_output.c:1885 icmpv6_push_pending_frames+0x6d1/0x710 net/ipv6/icmp.c:304 icmp6_send+0x3979/0x40e0 net/ipv6/icmp.c:617 icmpv6_send+0xdf/0x110 net/ipv6/ip6_icmp.c:43 ip6_pkt_drop+0x906/0xa00 net/ipv6/route.c:4406 ip6_pkt_discard_out+0xbb/0x130 net/ipv6/route.c:4419 dst_output include/net/dst.h:443 [inline] ip6_local_out+0x17b/0x1e0 net/ipv6/output_core.c:179 ip6tunnel_xmit include/net/ip6_tunnel.h:160 [inline] udp_tunnel6_xmit_skb+0x818/0xf80 net/ipv6/ip6_udp_tunnel.c:109 geneve6_xmit_skb drivers/net/geneve.c:973 [inline] geneve_xmit+0x2b5d/0x3200 drivers/net/geneve.c:1002 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one+0x3cf/0x750 net/core/dev.c:3556 dev_hard_start_xmit net/core/dev.c:3572 [inline] __dev_queue_xmit+0x3aad/0x4470 net/core/dev.c:4131 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164 batadv_send_skb_packet+0x622/0x970 net/batman-adv/send.c:108 batadv_send_broadcast_skb+0x76/0x90 net/batman-adv/send.c:127 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:393 [inline] batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:419 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0xb2e/0xef0 net/batman-adv/bat_iv_ogm.c:1710 process_one_work+0x1688/0x2140 kernel/workqueue.c:2269 worker_thread+0x10bc/0x2730 kernel/workqueue.c:2415 kthread+0x551/0x590 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116 csum_partial_copy+0xae/0x100 lib/checksum.c:154 skb_copy_and_csum_bits+0x261/0x1360 net/core/skbuff.c:2737 icmpv6_getfrag+0x148/0x3b0 net/ipv6/icmp.c:319 __ip6_append_data+0x5a33/0x71b0 net/ipv6/ip6_output.c:1623 ip6_append_data+0x44b/0x6e0 net/ipv6/ip6_output.c:1757 icmp6_send+0x3711/0x40e0 net/ipv6/icmp.c:609 icmpv6_send+0xdf/0x110 net/ipv6/ip6_icmp.c:43 ip6_pkt_drop+0x906/0xa00 net/ipv6/route.c:4406 ip6_pkt_discard_out+0xbb/0x130 net/ipv6/route.c:4419 dst_output include/net/dst.h:443 [inline] ip6_local_out+0x17b/0x1e0 net/ipv6/output_core.c:179 ip6tunnel_xmit include/net/ip6_tunnel.h:160 [inline] udp_tunnel6_xmit_skb+0x818/0xf80 net/ipv6/ip6_udp_tunnel.c:109 geneve6_xmit_skb drivers/net/geneve.c:973 [inline] geneve_xmit+0x2b5d/0x3200 drivers/net/geneve.c:1002 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one+0x3cf/0x750 net/core/dev.c:3556 dev_hard_start_xmit net/core/dev.c:3572 [inline] __dev_queue_xmit+0x3aad/0x4470 net/core/dev.c:4131 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164 batadv_send_skb_packet+0x622/0x970 net/batman-adv/send.c:108 batadv_send_broadcast_skb+0x76/0x90 net/batman-adv/send.c:127 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:393 [inline] batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:419 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0xb2e/0xef0 net/batman-adv/bat_iv_ogm.c:1710 process_one_work+0x1688/0x2140 kernel/workqueue.c:2269 worker_thread+0x10bc/0x2730 kernel/workqueue.c:2415 kthread+0x551/0x590 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116 pskb_expand_head+0x3fd/0x1e30 net/core/skbuff.c:1636 __skb_cow include/linux/skbuff.h:3145 [inline] skb_cow_head include/linux/skbuff.h:3179 [inline] geneve_build_skb+0x575/0xf90 drivers/net/geneve.c:754 geneve6_xmit_skb drivers/net/geneve.c:969 [inline] geneve_xmit+0x286c/0x3200 drivers/net/geneve.c:1002 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one+0x3cf/0x750 net/core/dev.c:3556 dev_hard_start_xmit net/core/dev.c:3572 [inline] __dev_queue_xmit+0x3aad/0x4470 net/core/dev.c:4131 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164 batadv_send_skb_packet+0x622/0x970 net/batman-adv/send.c:108 batadv_send_broadcast_skb+0x76/0x90 net/batman-adv/send.c:127 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:393 [inline] batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:419 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0xb2e/0xef0 net/batman-adv/bat_iv_ogm.c:1710 process_one_work+0x1688/0x2140 kernel/workqueue.c:2269 worker_thread+0x10bc/0x2730 kernel/workqueue.c:2415 kthread+0x551/0x590 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116 pskb_expand_head+0x3fd/0x1e30 net/core/skbuff.c:1636 __skb_cow include/linux/skbuff.h:3145 [inline] skb_cow_head include/linux/skbuff.h:3179 [inline] batadv_skb_head_push+0x2cc/0x410 net/batman-adv/soft-interface.c:75 batadv_send_skb_packet+0x1ed/0x970 net/batman-adv/send.c:86 batadv_send_broadcast_skb+0x76/0x90 net/batman-adv/send.c:127 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:393 [inline] batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:419 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0xb2e/0xef0 net/batman-adv/bat_iv_ogm.c:1710 process_one_work+0x1688/0x2140 kernel/workqueue.c:2269 worker_thread+0x10bc/0x2730 kernel/workqueue.c:2415 kthread+0x551/0x590 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Uninit was created at: kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:269 [inline] kmsan_alloc_page+0xc5/0x1a0 mm/kmsan/kmsan_shadow.c:293 __alloc_pages_nodemask+0xdf0/0x1030 mm/page_alloc.c:4889 __alloc_pages include/linux/gfp.h:509 [inline] __alloc_pages_node include/linux/gfp.h:522 [inline] alloc_pages_node include/linux/gfp.h:536 [inline] __page_frag_cache_refill mm/page_alloc.c:4964 [inline] page_frag_alloc+0x35b/0x880 mm/page_alloc.c:4994 __netdev_alloc_skb+0xc3d/0xc90 net/core/skbuff.c:456 __netdev_alloc_skb_ip_align include/linux/skbuff.h:2826 [inline] netdev_alloc_skb_ip_align include/linux/skbuff.h:2836 [inline] batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:558 [inline] batadv_iv_ogm_queue_add+0x13bf/0x1c60 net/batman-adv/bat_iv_ogm.c:670 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:849 [inline] batadv_iv_ogm_schedule+0x126d/0x1660 net/batman-adv/bat_iv_ogm.c:869 batadv_iv_send_outstanding_bat_ogm_packet+0xd69/0xef0 net/batman-adv/bat_iv_ogm.c:1722 process_one_work+0x1688/0x2140 kernel/workqueue.c:2269 worker_thread+0x10bc/0x2730 kernel/workqueue.c:2415 kthread+0x551/0x590 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 =====================================================