Hello, syzbot found the following crash on: HEAD commit: 8b97c627 kmsan: drop the opportunity to ignore pages git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=17830eac100000 kernel config: https://syzkaller.appspot.com/x/.config?x=6f048d804e1a47a0 dashboard link: https://syzkaller.appspot.com/bug?extid=266e61dcc3259a67d5ec compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+266e61dcc3259a67d5ec@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in nf_ip6_checksum+0x58d/0x610 net/netfilter/utils.c:74 CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.7.0-rc4-syzkaller #0 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+0x1c9/0x220 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 nf_ip6_checksum+0x58d/0x610 net/netfilter/utils.c:74 nf_nat_icmpv6_reply_translation+0x24b/0x10c0 net/netfilter/nf_nat_proto.c:802 nf_nat_ipv6_fn+0x394/0x4d0 net/netfilter/nf_nat_proto.c:875 nf_nat_ipv6_in+0x126/0x3c0 net/netfilter/nf_nat_proto.c:894 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0x16e/0x400 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:262 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ipv6_rcv+0x273/0x710 net/ipv6/ip6_input.c:307 __netif_receive_skb_one_core net/core/dev.c:5188 [inline] __netif_receive_skb net/core/dev.c:5302 [inline] process_backlog+0xa41/0x1410 net/core/dev.c:6134 napi_poll net/core/dev.c:6572 [inline] net_rx_action+0x786/0x1aa0 net/core/dev.c:6640 __do_softirq+0x311/0x83d kernel/softirq.c:293 run_ksoftirqd+0x25/0x40 kernel/softirq.c:608 smpboot_thread_fn+0x493/0x980 kernel/smpboot.c:165 kthread+0x4b5/0x4f0 kernel/kthread.c:269 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353 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 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165 __skb_checksum_complete+0x422/0x540 net/core/skbuff.c:2858 nf_ip6_checksum+0x501/0x610 net/netfilter/utils.c:91 nf_nat_icmpv6_reply_translation+0x24b/0x10c0 net/netfilter/nf_nat_proto.c:802 nf_nat_ipv6_fn+0x394/0x4d0 net/netfilter/nf_nat_proto.c:875 nf_nat_ipv6_local_fn+0xb0/0x690 net/netfilter/nf_nat_proto.c:948 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0x16e/0x400 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:262 [inline] __ip6_local_out+0x56d/0x750 net/ipv6/output_core.c:167 ip6_local_out+0xa4/0x1d0 net/ipv6/output_core.c:177 ip6_send_skb net/ipv6/ip6_output.c:1865 [inline] ip6_push_pending_frames+0x213/0x4f0 net/ipv6/ip6_output.c:1885 icmpv6_push_pending_frames+0x674/0x6b0 net/ipv6/icmp.c:304 icmp6_send+0x32a3/0x39d0 net/ipv6/icmp.c:617 icmpv6_send+0xe4/0x110 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x68/0x590 net/ipv6/route.c:2640 dst_link_failure include/net/dst.h:418 [inline] ndisc_error_report+0x106/0x1a0 net/ipv6/ndisc.c:710 neigh_invalidate+0x348/0x8d0 net/core/neighbour.c:993 neigh_timer_handler+0xb1a/0x1530 net/core/neighbour.c:1080 call_timer_fn+0x218/0x510 kernel/time/timer.c:1405 expire_timers kernel/time/timer.c:1450 [inline] __run_timers+0xcff/0x1210 kernel/time/timer.c:1774 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1787 __do_softirq+0x311/0x83d kernel/softirq.c: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:174 skb_copy_and_csum_bits+0x227/0x1130 net/core/skbuff.c:2737 icmpv6_getfrag+0x15f/0x350 net/ipv6/icmp.c:319 __ip6_append_data+0x50d7/0x63e0 net/ipv6/ip6_output.c:1623 ip6_append_data+0x3cb/0x660 net/ipv6/ip6_output.c:1757 icmp6_send+0x306a/0x39d0 net/ipv6/icmp.c:609 icmpv6_send+0xe4/0x110 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x68/0x590 net/ipv6/route.c:2640 dst_link_failure include/net/dst.h:418 [inline] ndisc_error_report+0x106/0x1a0 net/ipv6/ndisc.c:710 neigh_invalidate+0x348/0x8d0 net/core/neighbour.c:993 neigh_timer_handler+0xb1a/0x1530 net/core/neighbour.c:1080 call_timer_fn+0x218/0x510 kernel/time/timer.c:1405 expire_timers kernel/time/timer.c:1450 [inline] __run_timers+0xcff/0x1210 kernel/time/timer.c:1774 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1787 __do_softirq+0x311/0x83d kernel/softirq.c: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+0x38b/0x1b00 net/core/skbuff.c:1636 __skb_cow include/linux/skbuff.h:3171 [inline] skb_cow_head include/linux/skbuff.h:3205 [inline] geneve_build_skb+0x4c0/0xe00 drivers/net/geneve.c:754 geneve6_xmit_skb drivers/net/geneve.c:969 [inline] geneve_xmit+0x1b21/0x2c20 drivers/net/geneve.c:1001 __netdev_start_xmit include/linux/netdevice.h:4533 [inline] netdev_start_xmit include/linux/netdevice.h:4547 [inline] xmit_one net/core/dev.c:3477 [inline] dev_hard_start_xmit+0x531/0xab0 net/core/dev.c:3493 __dev_queue_xmit+0x2f8d/0x3b20 net/core/dev.c:4052 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4085 batadv_send_skb_packet+0x59b/0x8c0 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+0x97e/0xd50 net/batman-adv/bat_iv_ogm.c:1710 process_one_work+0x1555/0x1f40 kernel/workqueue.c:2268 worker_thread+0xef6/0x2450 kernel/workqueue.c:2414 kthread+0x4b5/0x4f0 kernel/kthread.c:269 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353 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+0x38b/0x1b00 net/core/skbuff.c:1636 __skb_cow include/linux/skbuff.h:3171 [inline] skb_cow_head include/linux/skbuff.h:3205 [inline] batadv_skb_head_push+0x234/0x350 net/batman-adv/soft-interface.c:74 batadv_send_skb_packet+0x1a7/0x8c0 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+0x97e/0xd50 net/batman-adv/bat_iv_ogm.c:1710 process_one_work+0x1555/0x1f40 kernel/workqueue.c:2268 worker_thread+0xef6/0x2450 kernel/workqueue.c:2414 kthread+0x4b5/0x4f0 kernel/kthread.c:269 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353 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+0xb9/0x180 mm/kmsan/kmsan_shadow.c:293 __alloc_pages_nodemask+0x56a2/0x5dc0 mm/page_alloc.c:4848 __alloc_pages include/linux/gfp.h:504 [inline] __alloc_pages_node include/linux/gfp.h:517 [inline] alloc_pages_node include/linux/gfp.h:531 [inline] __page_frag_cache_refill mm/page_alloc.c:4923 [inline] page_frag_alloc+0x3ae/0x910 mm/page_alloc.c:4953 __netdev_alloc_skb+0x703/0xbb0 net/core/skbuff.c:456 __netdev_alloc_skb_ip_align include/linux/skbuff.h:2852 [inline] netdev_alloc_skb_ip_align include/linux/skbuff.h:2862 [inline] batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:558 [inline] batadv_iv_ogm_queue_add+0x10da/0x1900 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+0x10cb/0x1430 net/batman-adv/bat_iv_ogm.c:869 batadv_iv_send_outstanding_bat_ogm_packet+0xbae/0xd50 net/batman-adv/bat_iv_ogm.c:1722 process_one_work+0x1555/0x1f40 kernel/workqueue.c:2268 worker_thread+0xef6/0x2450 kernel/workqueue.c:2414 kthread+0x4b5/0x4f0 kernel/kthread.c:269 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353 ===================================================== --- This bug is generated by a bot. 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