R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2f60db06d4 R13: 00000000004c5916 R14: 00000000004d9c70 R15: 0000000000000007 Unknown ioctl 28692 Unknown ioctl 28692 ================================================================== BUG: KMSAN: uninit-value in gue6_err+0x646/0x1130 net/ipv6/fou6.c:102 CPU: 0 PID: 10445 Comm: syz-executor.0 Not tainted 5.0.0+ #17 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+0x173/0x1d0 lib/dump_stack.c:113 kmsan_report+0x131/0x2a0 mm/kmsan/kmsan.c:624 __msan_warning+0x7a/0xf0 mm/kmsan/kmsan_instr.c:310 gue6_err+0x646/0x1130 net/ipv6/fou6.c:102 __udp6_lib_err_encap_no_sk net/ipv6/udp.c:436 [inline] __udp6_lib_err_encap net/ipv6/udp.c:493 [inline] __udp6_lib_err+0x18d0/0x2590 net/ipv6/udp.c:524 udpv6_err+0x118/0x130 net/ipv6/udp.c:609 icmpv6_notify+0x462/0x9f0 net/ipv6/icmp.c:788 icmpv6_rcv+0x18ac/0x3fa0 net/ipv6/icmp.c:876 ip6_protocol_deliver_rcu+0xb5a/0x23a0 net/ipv6/ip6_input.c:394 ip6_input_finish net/ipv6/ip6_input.c:434 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] ip6_input+0x2b6/0x350 net/ipv6/ip6_input.c:443 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x4de/0x6d0 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:289 [inline] ipv6_rcv+0x34b/0x3f0 net/ipv6/ip6_input.c:272 __netif_receive_skb_one_core net/core/dev.c:4973 [inline] __netif_receive_skb net/core/dev.c:5083 [inline] process_backlog+0x756/0x10e0 net/core/dev.c:5923 napi_poll net/core/dev.c:6346 [inline] net_rx_action+0x78b/0x1a60 net/core/dev.c:6412 __do_softirq+0x53f/0x93a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x214/0x250 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1064 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:814 RIP: 0010:finish_lock_switch+0x2b/0x40 kernel/sched/core.c:2597 Code: 48 89 e5 53 48 89 fb e8 33 ed 95 00 8b b8 88 0c 00 00 48 8b 00 48 85 c0 75 12 48 89 df e8 bd e1 95 00 c6 00 00 c6 03 00 fb 5b <5d> c3 e8 1e ec 95 00 eb e7 66 90 66 2e 0f 1f 84 00 00 00 00 00 55 RSP: 0018:ffff88805730fc80 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff88821fef1d80 RBX: ffff888063c30000 RCX: ccccccccccccd000 RDX: ffff88821fe2ed80 RSI: ffffea000a9fab50 RDI: ffff88812fcb7d80 RBP: ffff88805730fc80 R08: 0000000000000000 R09: ffff88812fcb7d81 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff888102860988 R14: ffff888102860000 R15: ffff88812fcb7d80 finish_task_switch+0xfc/0x2d0 kernel/sched/core.c:2698 context_switch kernel/sched/core.c:2851 [inline] __schedule+0x6cc/0x800 kernel/sched/core.c:3491 schedule+0x15b/0x240 kernel/sched/core.c:3535 freezable_schedule include/linux/freezer.h:172 [inline] do_nanosleep+0x2ba/0x980 kernel/time/hrtimer.c:1679 hrtimer_nanosleep kernel/time/hrtimer.c:1733 [inline] __do_sys_nanosleep kernel/time/hrtimer.c:1767 [inline] __se_sys_nanosleep+0x746/0x960 kernel/time/hrtimer.c:1754 __x64_sys_nanosleep+0x3e/0x60 kernel/time/hrtimer.c:1754 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x4859d0 Code: 00 00 48 c7 c0 d4 ff ff ff 64 c7 00 16 00 00 00 31 c0 eb be 66 0f 1f 44 00 00 83 3d 81 0d 5d 00 00 75 14 b8 23 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 b4 e0 f8 ff c3 48 83 ec 08 e8 ea 53 fd ff RSP: 002b:0000000000a4fd58 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 000000000009ae5c RCX: 00000000004859d0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a4fd60 RBP: 000000000000049b R08: 0000000000000001 R09: 0000000002062940 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000001f R13: 0000000000a4fdb0 R14: 000000000009ae3e R15: 0000000000a4fdc0 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:159 kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:173 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:182 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc_node mm/slub.c:2773 [inline] __kmalloc_node_track_caller+0xe9e/0xff0 mm/slub.c:4398 __kmalloc_reserve net/core/skbuff.c:140 [inline] __alloc_skb+0x309/0xa20 net/core/skbuff.c:208 alloc_skb include/linux/skbuff.h:1012 [inline] alloc_skb_with_frags+0x186/0xa60 net/core/skbuff.c:5287 sock_alloc_send_pskb+0xafd/0x10a0 net/core/sock.c:2091 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2108 __ip6_append_data+0x42ed/0x5dc0 net/ipv6/ip6_output.c:1443 ip6_append_data+0x3c2/0x650 net/ipv6/ip6_output.c:1619 icmp6_send+0x2dc7/0x3c30 net/ipv6/icmp.c:578 icmpv6_send+0xe5/0x110 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x5c/0x2c0 net/ipv6/route.c:2243 dst_link_failure include/net/dst.h:427 [inline] ndisc_error_report+0x106/0x1a0 net/ipv6/ndisc.c:695 neigh_invalidate+0x359/0x8e0 net/core/neighbour.c:992 neigh_timer_handler+0xdf2/0x1280 net/core/neighbour.c:1078 call_timer_fn+0x285/0x600 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1362 [inline] __run_timers+0xdb4/0x11d0 kernel/time/timer.c:1681 run_timer_softirq+0x2e/0x50 kernel/time/timer.c:1694 __do_softirq+0x53f/0x93a kernel/softirq.c:293 ==================================================================