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BUG: KMSAN: uninit-value in _decode_session6+0x635/0x1630 net/ipv6/xfrm6_policy.c:149
CPU: 0 PID: 15616 Comm: blkid Not tainted 4.19.0-rc7+ #69
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: 0033:0x7f3f432f61f5
Code: 48 85 c0 74 06 48 83 c4 18 ff e0 48 89 7c 24 08 e8 00 ff ff ff 48 8b 05 81 8d 36 00 48 8b 7c 24 08 eb e2 90 90 31 c0 53 0f a2 <81> f9 6e 74 65 6c 89 05 c3 cf 36 00 0f 85 d1 00 00 00 81 fb 47 65
RSP: 002b:00007ffe72bd6eb8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 000000000000000d RBX: 00000000756e6547 RCX: 000000006c65746e
RDX: 0000000049656e69 RSI: 0000000000000025 RDI: 0000000000000002
RBP: 00007ffe72bd6fb0 R08: 0000000000000001 R09: 000000000000002f
R10: 00007f3f432f5af0 R11: 00007ffe72bd6d00 R12: 00007f3f432d7000
R13: 00007f3f4365e038 R14: 00007f3f432f5ac0 R15: 00007f3f4365ed98

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]
 pskb_expand_head+0x319/0x1d00 net/core/skbuff.c:1461
 __pskb_pull_tail+0x1db/0x21c0 net/core/skbuff.c:1895
 pskb_may_pull include/linux/skbuff.h:2127 [inline]
 _decode_session6+0x7b0/0x1630 net/ipv6/xfrm6_policy.c:150
 __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
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