================================================================== BUG: KMSAN: uninit-value in _decode_session6+0x6d1/0x1290 net/ipv6/xfrm6_policy.c:151 CPU: 1 PID: 5714 Comm: blkid Not tainted 4.16.0+ #81 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:53 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676 _decode_session6+0x6d1/0x1290 net/ipv6/xfrm6_policy.c:151 __xfrm_decode_session+0x140/0x1c0 net/xfrm/xfrm_policy.c:2368 xfrm_decode_session_reverse include/net/xfrm.h:1213 [inline] icmpv6_route_lookup net/ipv6/icmp.c:372 [inline] icmp6_send+0x305f/0x3460 net/ipv6/icmp.c:551 icmpv6_send+0xe0/0x110 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x8f/0x580 net/ipv6/route.c:2034 dst_link_failure include/net/dst.h:426 [inline] ndisc_error_report+0x101/0x1a0 net/ipv6/ndisc.c:695 neigh_invalidate+0x385/0x930 net/core/neighbour.c:883 neigh_timer_handler+0xd85/0x12d0 net/core/neighbour.c:969 call_timer_fn+0x26a/0x5a0 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0xda7/0x11c0 kernel/time/timer.c:1666 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692 __do_softirq+0x56d/0x93d kernel/softirq.c:285 invoke_softirq kernel/softirq.c:365 [inline] irq_exit+0x202/0x240 kernel/softirq.c:405 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:541 smp_apic_timer_interrupt+0x64/0x90 arch/x86/kernel/apic/apic.c:1055 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:857 RIP: 0010:kmsan_get_origin_address_noruntime+0x8f/0x260 include/linux/mmzone.h:1206 RSP: 0000:ffff880165b0fb40 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff12 RAX: ffff8801e5b0fcc8 RBX: 0000000000000000 RCX: ffff88021fff1580 RDX: 0000000000000580 RSI: 0000000000000000 RDI: ffff880165b0fcc8 RBP: ffff880165b0fb78 R08: 0000000001080020 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000068 R13: 00000000d3a0004b R14: ffff880165b0fcc8 R15: 0000000000000000 kmsan_set_origin_inline+0x6b/0x120 mm/kmsan/kmsan_instr.c:585 __msan_poison_alloca+0x15c/0x1d0 mm/kmsan/kmsan_instr.c:647 handle_mm_fault+0x1c8/0x7ba0 mm/memory.c:4114 __do_page_fault+0xec4/0x1a10 arch/x86/mm/fault.c:1423 do_page_fault+0xd3/0x260 arch/x86/mm/fault.c:1500 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1151 RIP: 0033:0x7f93ad8e4789 RSP: 002b:00007ffd11b3cf20 EFLAGS: 00010216 RAX: 00007f93ad4742a0 RBX: 00007f93adaf79a8 RCX: 00000000000004a8 RDX: 00007f93ad6a9028 RSI: aaaaaaaaaaaaaaab RDI: 0000000000000000 RBP: 00007ffd11b3d000 R08: 0000000000000001 R09: 0000000000000010 R10: 00007f93ad343a30 R11: 0000000000000206 R12: 00007f93ad325000 R13: 00007f93ad343220 R14: 00007f93ad33d748 R15: 00007f93adaef740 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline] kmsan_save_stack mm/kmsan/kmsan.c:293 [inline] kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684 kmsan_memcpy_origins+0x11d/0x170 mm/kmsan/kmsan.c:526 __msan_memcpy+0x19f/0x1f0 mm/kmsan/kmsan_instr.c:470 skb_copy_bits+0x63a/0xdb0 net/core/skbuff.c:2046 __pskb_pull_tail+0x483/0x22e0 net/core/skbuff.c:1883 pskb_may_pull include/linux/skbuff.h:2112 [inline] _decode_session6+0x79f/0x1290 net/ipv6/xfrm6_policy.c:152 __xfrm_decode_session+0x140/0x1c0 net/xfrm/xfrm_policy.c:2368 xfrm_decode_session_reverse include/net/xfrm.h:1213 [inline] icmpv6_route_lookup net/ipv6/icmp.c:372 [inline] icmp6_send+0x305f/0x3460 net/ipv6/icmp.c:551 icmpv6_send+0xe0/0x110 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x8f/0x580 net/ipv6/route.c:2034 dst_link_failure include/net/dst.h:426 [inline] ndisc_error_report+0x101/0x1a0 net/ipv6/ndisc.c:695 neigh_invalidate+0x385/0x930 net/core/neighbour.c:883 neigh_timer_handler+0xd85/0x12d0 net/core/neighbour.c:969 call_timer_fn+0x26a/0x5a0 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0xda7/0x11c0 kernel/time/timer.c:1666 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692 __do_softirq+0x56d/0x93d kernel/softirq.c:285 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline] kmsan_alloc_meta_for_pages+0x161/0x3a0 mm/kmsan/kmsan.c:814 kmsan_alloc_page+0x82/0xe0 mm/kmsan/kmsan.c:868 __alloc_pages_nodemask+0xf5b/0x5dc0 mm/page_alloc.c:4283 alloc_pages_current+0x6b5/0x970 mm/mempolicy.c:2055 alloc_pages include/linux/gfp.h:494 [inline] skb_page_frag_refill+0x3ba/0x5e0 net/core/sock.c:2208 sk_page_frag_refill+0xa4/0x340 net/core/sock.c:2228 __ip6_append_data+0x1a20/0x4bb0 net/ipv6/ip6_output.c:1503 ip6_append_data+0x40e/0x6b0 net/ipv6/ip6_output.c:1576 rawv6_sendmsg+0x2787/0x4cc0 net/ipv6/raw.c:928 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg net/socket.c:640 [inline] sock_write_iter+0x3b9/0x470 net/socket.c:909 do_iter_readv_writev+0x7bb/0x970 include/linux/fs.h:1776 do_iter_write+0x30d/0xd40 fs/read_write.c:932 vfs_writev fs/read_write.c:977 [inline] do_writev+0x3c9/0x830 fs/read_write.c:1012 SYSC_writev+0x9b/0xb0 fs/read_write.c:1085 SyS_writev+0x56/0x80 fs/read_write.c:1082 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 ==================================================================