==================================================================
BUG: KMSAN: uninit-value in lock_timer_base kernel/time/timer.c:939 [inline]
BUG: KMSAN: uninit-value in __mod_timer+0x42d/0x2bf0 kernel/time/timer.c:1010
CPU: 1 PID: 9839 Comm: syz-executor1 Not tainted 4.17.0+ #9
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+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1125
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620
 lock_timer_base kernel/time/timer.c:939 [inline]
 __mod_timer+0x42d/0x2bf0 kernel/time/timer.c:1010
 mod_timer+0x70/0x80 kernel/time/timer.c:1102
 addrconf_mod_rs_timer net/ipv6/addrconf.c:321 [inline]
 addrconf_rs_timer+0xc20/0xc70 net/ipv6/addrconf.c:3803
 call_timer_fn+0x280/0x5d0 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xd96/0x11b0 kernel/time/timer.c:1666
 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692
 __do_softirq+0x592/0x979 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:525
 smp_apic_timer_interrupt+0x64/0x90 arch/x86/kernel/apic/apic.c:1055
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:866
 </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:ffff8801c275f818 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: ffff88013a1ca43c RBX: ffff88013a1c243c RCX: ffff880000000000
RDX: ffff88013a1da43c RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff8801c275f850 R08: 0000000001080020 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff81353e70 R12: 0000000000000000
R13: ffff88013a1ca43c R14: 0000000000000000 R15: 0000000000000282
 try_to_wake_up+0x1cfd/0x2260 kernel/sched/core.c:2079
 wake_up_process+0x34/0x40 kernel/sched/core.c:2148
 wake_up_q+0x5f/0xa0 kernel/sched/core.c:448
 futex_wake+0x955/0xba0 kernel/futex.c:1556
 do_futex+0xaa8/0x6c20 kernel/futex.c:3531
 __do_sys_futex kernel/futex.c:3587 [inline]
 __se_sys_futex+0x65f/0x860 kernel/futex.c:3555
 __x64_sys_futex+0x1a2/0x200 kernel/futex.c:3555
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455a99
RSP: 002b:0000000000a3e8f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 000000000072bea0 RCX: 0000000000455a99
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000072bec0
RBP: 000000000000055a R08: 0000000000a3ea30 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000a3ea30 R14: 000000000072bec4 R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:297 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:689
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:464
 timer_set_idx kernel/time/timer.c:480 [inline]
 enqueue_timer kernel/time/timer.c:539 [inline]
 __internal_add_timer kernel/time/timer.c:548 [inline]
 internal_add_timer kernel/time/timer.c:590 [inline]
 __mod_timer+0x22a1/0x2bf0 kernel/time/timer.c:1055
 mod_timer+0x70/0x80 kernel/time/timer.c:1102
 addrconf_mod_rs_timer net/ipv6/addrconf.c:321 [inline]
 addrconf_rs_timer+0xc20/0xc70 net/ipv6/addrconf.c:3803
 call_timer_fn+0x280/0x5d0 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xd96/0x11b0 kernel/time/timer.c:1666
 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692
 __do_softirq+0x592/0x979 kernel/softirq.c:285

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:192
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:318
 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan.c:325
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2753 [inline]
 kmem_cache_alloc_node+0x8af/0xc80 mm/slub.c:2795
 __alloc_skb+0x202/0x9e0 net/core/skbuff.c:194
 alloc_skb include/linux/skbuff.h:988 [inline]
 ndisc_alloc_skb+0x1a5/0x5d0 net/ipv6/ndisc.c:403
 ndisc_send_rs+0x4f7/0xc30 net/ipv6/ndisc.c:669
 addrconf_rs_timer+0x8a1/0xc70 net/ipv6/addrconf.c:3794
 call_timer_fn+0x280/0x5d0 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xd96/0x11b0 kernel/time/timer.c:1666
 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692
 __do_softirq+0x592/0x979 kernel/softirq.c:285
==================================================================