INFO: rcu_preempt self-detected stall on CPU
	1-...: (10499 ticks this GP) idle=56e/140000000000002/0 softirq=15519/15519 fqs=0 
	 (t=10500 jiffies g=1825 c=1824 q=923)
rcu_preempt kthread starved for 10500 jiffies! g1825 c1824 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
rcu_preempt     R  running task    29984     8      2 0x80000000
Call Trace:
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746
 rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
NMI backtrace for cpu 1
CPU: 1 PID: 7887 Comm: syz-executor.0 Not tainted 4.14.175-syzkaller #0
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+0x13e/0x194 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline]
 rcu_dump_cpu_stacks+0x16d/0x1b8 kernel/rcu/tree.c:1396
 print_cpu_stall kernel/rcu/tree.c:1542 [inline]
 check_cpu_stall kernel/rcu/tree.c:1610 [inline]
 __rcu_pending kernel/rcu/tree.c:3390 [inline]
 rcu_pending kernel/rcu/tree.c:3452 [inline]
 rcu_check_callbacks.cold+0x490/0xdaa kernel/rcu/tree.c:2792
 update_process_times+0x29/0x60 kernel/time/timer.c:1590
 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165
 tick_sched_timer+0x3e/0x120 kernel/time/tick-sched.c:1223
 __run_hrtimer kernel/time/hrtimer.c:1223 [inline]
 __hrtimer_run_queues+0x25c/0xbb0 kernel/time/hrtimer.c:1287
 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline]
 smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100
 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792
RIP: 0010:memcmp+0x20/0xb0 lib/string.c:860
RSP: 0018:ffff8880aeb071f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000000 RBX: ffff8880aeb072e5 RCX: 0000000000000005
RDX: 00000000000000ff RSI: ffff888054dc0f35 RDI: ffff8880aeb07288
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000006
R10: ffff888053ce2a70 R11: ffff888053ce2100 R12: ffff8880aeb07318
R13: 0000000000000012 R14: ffff8880aeb07288 R15: ffff888054dc0ec0
 find_stack lib/stackdepot.c:180 [inline]
 depot_save_stack+0x10d/0x401 lib/stackdepot.c:229
 save_stack+0x89/0xa0 mm/kasan/kasan.c:453
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc mm/kasan/kasan.c:551 [inline]
 kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529
 slab_post_alloc_hook mm/slab.h:442 [inline]
 slab_alloc mm/slab.c:3390 [inline]
 kmem_cache_alloc+0x114/0x770 mm/slab.c:3550
 kmem_cache_zalloc include/linux/slab.h:651 [inline]
 fill_pool lib/debugobjects.c:110 [inline]
 __debug_object_init+0x5b7/0x830 lib/debugobjects.c:341
 debug_object_init lib/debugobjects.c:393 [inline]
 debug_object_activate+0x274/0x450 lib/debugobjects.c:474
 debug_rcu_head_queue kernel/rcu/rcu.h:152 [inline]
 __call_rcu.constprop.0+0x31/0x7e0 kernel/rcu/tree.c:3050
 dst_release+0x56/0x80 net/core/dst.c:188
 refdst_drop include/net/dst.h:286 [inline]
 skb_dst_drop include/net/dst.h:298 [inline]
 __dev_queue_xmit+0x17df/0x25c0 net/core/dev.c:3484
 neigh_resolve_output net/core/neighbour.c:1369 [inline]
 neigh_resolve_output+0x50a/0x8b0 net/core/neighbour.c:1349
 neigh_output include/net/neighbour.h:500 [inline]
 ip6_finish_output2+0x992/0x2150 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x4d9/0xaf0 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:239 [inline]
 ip6_output+0x1c9/0x650 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:462 [inline]
 NF_HOOK include/linux/netfilter.h:250 [inline]
 ndisc_send_skb+0xb56/0x11e0 net/ipv6/ndisc.c:483
 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677
 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3761
 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279
 expire_timers kernel/time/timer.c:1318 [inline]
 __run_timers kernel/time/timer.c:1636 [inline]
 __run_timers kernel/time/timer.c:1604 [inline]
 run_timer_softirq+0x52a/0x1390 kernel/time/timer.c:1649
 __do_softirq+0x254/0x9bf kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x15b/0x1a0 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:648 [inline]
 smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792
 </IRQ>
RIP: 0010:memcmp+0x42/0xb0 lib/string.c:861
RSP: 0018:ffff888053cef570 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000000 RBX: ffff888053cef63d RCX: 0000000000000004
RDX: 0000000000000005 RSI: ffff888099c92fed RDI: ffff888053cef608
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000002
R10: ffff888053ce29d0 R11: ffff888053ce2100 R12: ffff888053cef688
R13: 0000000000000010 R14: ffff888053cef608 R15: ffff888099c92fa0
 find_stack lib/stackdepot.c:180 [inline]
 depot_save_stack+0x10d/0x401 lib/stackdepot.c:229
 save_stack+0x89/0xa0 mm/kasan/kasan.c:453
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc mm/kasan/kasan.c:551 [inline]
 kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529
 kmem_cache_alloc+0x127/0x770 mm/slab.c:3552
 proc_alloc_inode+0x18/0x1a0 fs/proc/inode.c:62
 alloc_inode+0x5d/0x170 fs/inode.c:210
 new_inode_pseudo+0x14/0xe0 fs/inode.c:899
 new_inode+0x1b/0x40 fs/inode.c:928
 proc_pid_make_inode+0x22/0x230 fs/proc/base.c:1763
 proc_pident_instantiate+0x78/0x280 fs/proc/base.c:2449
 proc_pident_lookup+0x17a/0x1f0 fs/proc/base.c:2498
 lookup_open+0x5d1/0x1750 fs/namei.c:3220
 do_last fs/namei.c:3334 [inline]
 path_openat+0x1878/0x3c50 fs/namei.c:3569
 do_filp_open+0x18e/0x250 fs/namei.c:3603
 do_sys_open+0x29d/0x3f0 fs/open.c:1081
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x416621
RSP: 002b:00007fc698b0bbb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fc698b0c6d4 RCX: 0000000000416621
RDX: 00007fc698b0bbdd RSI: 0000000000000002 RDI: 00007fc698b0bbd0
RBP: 000000000076bf00 R08: 0000000000000000 R09: 000000000000000d
R10: 0000000000000002 R11: 0000000000000293 R12: 00000000ffffffff
R13: 0000000000000c18 R14: 00000000004ce47e R15: 000000000076bf0c