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BUG: KMSAN: uninit-value in neigh_hash_grow net/core/neighbour.c:444 [inline]
BUG: KMSAN: uninit-value in __neigh_create+0x1e6a/0x2b00 net/core/neighbour.c:554
CPU: 0 PID: 21737 Comm: syz-executor1 Not tainted 4.20.0-rc5+ #111
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+0x284/0x3b0 lib/dump_stack.c:113
 kmsan_report+0x12d/0x290 mm/kmsan/kmsan.c:684
 __msan_warning+0x76/0xc0 mm/kmsan/kmsan_instr.c:316
 neigh_hash_grow net/core/neighbour.c:444 [inline]
 __neigh_create+0x1e6a/0x2b00 net/core/neighbour.c:554
 ip_finish_output2+0xa28/0x1590 net/ipv4/ip_output.c:224
 ip_finish_output+0xd84/0x10a0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_output+0x559/0x620 net/ipv4/ip_output.c:405
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:124
 igmpv3_sendpack net/ipv4/igmp.c:417 [inline]
 igmpv3_send_cr net/ipv4/igmp.c:705 [inline]
 igmp_ifc_timer_expire+0x12d1/0x1a30 net/ipv4/igmp.c:793
 call_timer_fn+0x332/0x770 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xe63/0x12d0 kernel/time/timer.c:1682
 run_timer_softirq+0x55/0xa0 kernel/time/timer.c:1695
 __do_softirq+0x66f/0xb76 kernel/softirq.c:293
 invoke_softirq kernel/softirq.c:375 [inline]
 irq_exit+0x2ae/0x2f0 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:1063
 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:811
 </IRQ>
RIP: 0010:finish_lock_switch+0x2b/0x40 kernel/sched/core.c:2584
Code: 48 89 e5 53 48 89 fb e8 43 66 9b 00 8b b8 88 0c 00 00 48 8b 00 48 85 c0 75 12 48 89 df e8 dd 5b 9b 00 c6 00 00 c6 03 00 fb 5b <5d> c3 e8 5e 65 9b 00 eb e7 66 90 66 2e 0f 1f 84 00 00 00 00 00 55
RSP: 0018:ffff888177c1f7a0 EFLAGS: 00000296 ORIG_RAX: ffffffffffffff13
RAX: ffff8881db1beb40 RBX: ffff888142063c00 RCX: ffff8881db1beb40
RDX: ffff8881db1bfb40 RSI: 0000160000000000 RDI: aaaaaaaaaaaab000
RBP: ffff888177c1f7a0 R08: ffff888000000000 R09: ffff888177c1f6f8
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888142060000
R13: ffff88821fcb84d0 R14: ffff888142060988 R15: ffff88821fcb7b40
 finish_task_switch+0x18e/0x400 kernel/sched/core.c:2685
 context_switch kernel/sched/core.c:2838 [inline]
 __schedule+0x845/0x9e0 kernel/sched/core.c:3478
 schedule+0x1bb/0x2c0 kernel/sched/core.c:3522
 freezable_schedule include/linux/freezer.h:172 [inline]
 futex_wait_queue_me+0x6da/0x8b0 kernel/futex.c:2530
 futex_wait+0x481/0xe60 kernel/futex.c:2645
 do_futex+0xcf4/0x7040 kernel/futex.c:3528
 __do_sys_futex kernel/futex.c:3589 [inline]
 __se_sys_futex+0x43d/0x800 kernel/futex.c:3557
 __x64_sys_futex+0x6e/0x90 kernel/futex.c:3557
 do_syscall_64+0xcd/0x110 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457569
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:0000000000a3fbf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 000000000072bfa0 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bfac
RBP: 000000000000002d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000a3fcc0 R11: 0000000000000246 R12: 000000000072bfac
R13: 00000000000003e8 R14: 00000000000ad0d6 R15: 00000000000ad0a9

Uninit was created at:
No stack
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