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BUG: KMSAN: uninit-value in _decode_session6+0x635/0x1630 net/ipv6/xfrm6_policy.c:149
CPU: 1 PID: 9363 Comm: modprobe Not tainted 4.19.0-rc8+ #70
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x306/0x460 lib/dump_stack.c:113
 kmsan_report+0x1a2/0x2e0 mm/kmsan/kmsan.c:917
 __msan_warning+0x7c/0xe0 mm/kmsan/kmsan_instr.c:500
 _decode_session6+0x635/0x1630 net/ipv6/xfrm6_policy.c:149
 __xfrm_decode_session+0x156/0x200 net/xfrm/xfrm_policy.c:2299
 xfrm_decode_session_reverse include/net/xfrm.h:1239 [inline]
 icmpv6_route_lookup net/ipv6/icmp.c:372 [inline]
 icmp6_send+0x3037/0x3c50 net/ipv6/icmp.c:551
 icmpv6_send+0xe5/0x110 net/ipv6/ip6_icmp.c:43
 ip6_link_failure+0x5c/0x310 net/ipv6/route.c:2260
 dst_link_failure include/net/dst.h:427 [inline]
 ndisc_error_report+0x106/0x1a0 net/ipv6/ndisc.c:695
 neigh_invalidate+0x35a/0x900 net/core/neighbour.c:894
 neigh_timer_handler+0xca1/0x12a0 net/core/neighbour.c:980
 call_timer_fn+0x326/0x700 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xe75/0x12e0 kernel/time/timer.c:1682
 run_timer_softirq+0x2e/0x50 kernel/time/timer.c:1695
 __do_softirq+0x601/0xa6d kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x247/0x280 kernel/softirq.c:414
 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536
 smp_apic_timer_interrupt+0x64/0x90 arch/x86/kernel/apic/apic.c:1059
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:869
 </IRQ>
RIP: 0010:filemap_map_pages+0x125e/0x1d80 mm/filemap.c:2674
Code: 0f 85 06 01 00 00 4c 89 ad 48 ff ff ff 49 c1 e5 0c 48 8b bd e0 fe ff ff 4c 03 37 e8 0c 0c 32 00 48 8b 18 44 89 bd 7c ff ff ff <48> 85 db 74 03 44 8b 3a 4c 09 eb 48 83 bd 28 ff ff ff 00 0f 85 d9
RSP: 0000:ffff88007e8dfb08 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: ffff88007eb4fd50 RBX: 0000000000000000 RCX: ffff88007eb5fd50
RDX: ffff88007eb5fd50 RSI: aaaaaaaaaaaab000 RDI: ffffea0002f753a0
RBP: ffff88007e8dfc50 R08: 0000000000000000 R09: ffffffff8c2d9000
R10: 000000007d822000 R11: ffffffffffffffff R12: 0000000000000000
R13: 0000000000000000 R14: 00007f0ef5447000 R15: 00000000a00000bb
 do_fault_around mm/memory.c:3615 [inline]
 do_read_fault mm/memory.c:3649 [inline]
 do_fault mm/memory.c:3754 [inline]
 handle_pte_fault mm/memory.c:3985 [inline]
 __handle_mm_fault mm/memory.c:4109 [inline]
 handle_mm_fault+0x3e5c/0xa3a0 mm/memory.c:4146
 __do_page_fault+0xec9/0x1b50 arch/x86/mm/fault.c:1396
 do_page_fault+0x98/0xd0 arch/x86/mm/fault.c:1473
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1170
RIP: 0033:0x7f0ef543fcea
Code: 20 00 45 31 ed 44 8b 15 44 af 20 00 4c 8b 05 b5 af 20 00 48 8b 3d 46 b1 20 00 66 0f 1f 44 00 00 48 83 ea 03 48 83 fa 1e 77 16 <48> 63 14 91 48 01 ca ff e2 0f 1f 44 00 00 48 8b 58 08 0f 1f 40 00
RSP: 002b:00007ffc31b32b00 EFLAGS: 00010246
RAX: 00007ffc31b32c00 RBX: 0000000000000000 RCX: 00007f0ef5444400
RDX: 000000000000001e RSI: 00007f0ef542baf0 RDI: 0000000000000000
RBP: 00007f0ef542d4b0 R08: 0000000000000000 R09: 000000000000037f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:255 [inline]
 kmsan_internal_poison_shadow+0xc8/0x1d0 mm/kmsan/kmsan.c:180
 kmsan_kmalloc+0xa4/0x120 mm/kmsan/kmsan_hooks.c:104
 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:113
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2727 [inline]
 __kmalloc_node_track_caller+0xb43/0x1400 mm/slub.c:4360
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x422/0xe90 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:996 [inline]
 __ip6_append_data+0x3bf8/0x5170 net/ipv6/ip6_output.c:1425
 ip6_append_data+0x3d8/0x670 net/ipv6/ip6_output.c:1587
 rawv6_sendmsg+0x26c2/0x54d0 net/ipv6/raw.c:937
 inet_sendmsg+0x4d8/0x7f0 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xe47/0x1200 net/socket.c:2116
 __sys_sendmsg net/socket.c:2154 [inline]
 __do_sys_sendmsg net/socket.c:2163 [inline]
 __se_sys_sendmsg+0x307/0x460 net/socket.c:2161
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161
 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
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