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BUG: KMSAN: uninit-value in pcpu_addr_in_chunk mm/percpu.c:208 [inline]
BUG: KMSAN: uninit-value in pcpu_chunk_addr_search mm/percpu.c:1308 [inline]
BUG: KMSAN: uninit-value in free_percpu+0x2b8/0xb20 mm/percpu.c:1723
CPU: 0 PID: 2566 Comm: udevd Not tainted 4.16.0+ #87
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
 pcpu_addr_in_chunk mm/percpu.c:208 [inline]
 pcpu_chunk_addr_search mm/percpu.c:1308 [inline]
 free_percpu+0x2b8/0xb20 mm/percpu.c:1723
 ip6_dst_destroy+0x157/0x750 net/ipv6/route.c:398
 dst_destroy+0x209/0x7a0 net/core/dst.c:131
 dst_destroy_rcu+0x46/0x50 net/core/dst.c:153
 __rcu_reclaim kernel/rcu/rcu.h:172 [inline]
 rcu_do_batch kernel/rcu/tree.c:2674 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2933 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2900 [inline]
 rcu_process_callbacks+0x1708/0x2070 kernel/rcu/tree.c:2917
 __do_softirq+0x56d/0x93d kernel/softirq.c:285
 invoke_softirq kernel/softirq.c:365 [inline]
 irq_exit+0x202/0x240 kernel/softirq.c:405
 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:541
 smp_apic_timer_interrupt+0x64/0x90 arch/x86/kernel/apic/apic.c:1055
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:857
 </IRQ>
RIP: 0010:native_restore_fl arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:78 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x5a/0x80 kernel/locking/spinlock.c:184
RSP: 0018:ffff88019d58fbc8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff12
RAX: ffff88015b24073c RBX: ffff88015abc873c RCX: ffff880000000000
RDX: ffff88015b24873c RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff88019d58fc00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffff8801dc2fd7c0 R12: 0000000000000000
R13: ffff88015b24073c R14: 0000000000000000 R15: 0000000000000286
 task_rq_unlock kernel/sched/sched.h:1737 [inline]
 wake_up_new_task+0x14bf/0x1700 kernel/sched/core.c:2488
 _do_fork+0x765/0xf00 kernel/fork.c:2113
 SYSC_clone+0xf6/0x110 kernel/fork.c:2195
 SyS_clone+0x77/0xa0 kernel/fork.c:2189
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x7f4efd33af46
RSP: 002b:00007fff9f0259b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fff9f0259b0 RCX: 00007f4efd33af46
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fff9f025a10 R08: 0000000000000a06 R09: 0000000000000a06
R10: 00007f4efdc57a70 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff9f0259d0 R14: 0000000000000005 R15: 0000000000000005

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:528
 ip6_dst_alloc net/ipv6/route.c:379 [inline]
 icmp6_dst_alloc+0x674/0xc60 net/ipv6/route.c:2365
 ndisc_send_skb+0x343/0x1360 net/ipv6/ndisc.c:471
 ndisc_send_rs+0xbc5/0xbf0 net/ipv6/ndisc.c:685
 addrconf_rs_timer+0x63e/0xc80 net/ipv6/addrconf.c:3769
 call_timer_fn+0x26a/0x5a0 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xda7/0x11c0 kernel/time/timer.c:1666
 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692
 __do_softirq+0x56d/0x93d kernel/softirq.c:285
Local variable description: ----flags.i.i.i.i@_raw_spin_lock_irqsave
Variable was created at:
 _raw_spin_lock_irqsave+0x45/0xf0 kernel/locking/spinlock.c:150
 hrtimer_interrupt+0x101/0xaf0 kernel/time/hrtimer.c:1450
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