================================================================== BUG: KMSAN: uninit-value in _decode_session6+0x635/0x1630 net/ipv6/xfrm6_policy.c:149 CPU: 0 PID: 6136 Comm: sshd Not tainted 4.19.0-rc8+ #70 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+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 RIP: 0010:kmsan_internal_check_memory+0x165/0x460 mm/kmsan/kmsan.c:968 Code: 89 b5 60 ff ff ff ff b5 60 ff ff ff 9d 48 85 d2 0f 84 bf 01 00 00 48 8b 45 b0 4e 8d 2c 20 44 89 e8 25 ff 0f 00 00 80 3c 02 00 <0f> 84 05 01 00 00 48 89 55 90 48 c7 45 c8 00 00 00 00 9c 8f 45 c8 RSP: 0018:ffff8801ad9df4b0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000583 RBX: ffff8801ad9bf000 RCX: 00000001ad9bf580 RDX: ffff8801ad9bf000 RSI: ffff88021fff2000 RDI: 00000000000006a0 RBP: ffff8801ad9df550 R08: ffffffff7fffffff R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000003 R13: ffff8801ad9df583 R14: 0000000000000246 R15: 0000000000000005 kmsan_check_memory+0xb/0x10 mm/kmsan/kmsan.c:1004 atomic64_dec_and_test include/asm-generic/atomic-instrumented.h:369 [inline] atomic_long_dec_and_test include/asm-generic/atomic-long.h:218 [inline] fput+0xa7/0x3e0 fs/file_table.c:331 free_poll_entry fs/select.c:135 [inline] poll_freewait+0x116/0x380 fs/select.c:143 do_select+0x2c7b/0x2ce0 fs/select.c:581 core_sys_select+0xb68/0x1040 fs/select.c:650 kern_select fs/select.c:691 [inline] __do_sys_select fs/select.c:700 [inline] __se_sys_select+0x241/0x610 fs/select.c:697 __x64_sys_select+0x62/0x80 fs/select.c:697 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x7f963e4b0dd3 Code: 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 90 90 90 83 3d 25 48 2b 00 00 75 13 49 89 ca b8 17 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 ab 2f 01 00 48 89 04 24 RSP: 002b:00007ffc458160b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000017 RAX: ffffffffffffffda RBX: 00007ffc45816140 RCX: 00007f963e4b0dd3 RDX: 0000560611477ab0 RSI: 0000560611477ad0 RDI: 000000000000000c RBP: 000056060ff0c8dc R08: 00007ffc458160e0 R09: 0101010101010101 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc45816148 R13: 0000000000000000 R14: 00007ffc45816138 R15: 00007ffc4581613c 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 ==================================================================