EXT4-fs (loop0): mounting ext2 file system using the ext4 subsystem
INFO: rcu_preempt self-detected stall on CPU
	0-...: (10499 ticks this GP) idle=1fe/140000000000002/0 softirq=148244/148245 fqs=8 
	 (t=10500 jiffies g=46216 c=46215 q=296)
rcu_preempt kthread starved for 10482 jiffies! g46216 c46215 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1
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 0
CPU: 0 PID: 26942 Comm: syz-executor.4 Not tainted 4.14.176-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:orc_ip arch/x86/kernel/unwind_orc.c:27 [inline]
RIP: 0010:__orc_find+0x6f/0xf0 arch/x86/kernel/unwind_orc.c:49
RSP: 0018:ffff8880aea07678 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff1141755 RBX: ffffffff88a0baa8 RCX: ffffffff8163ed32
RDX: 0000000000000000 RSI: ffffffff88eee9dc RDI: ffffffff88a0baa8
RBP: ffffffff88a0baa8 R08: ffffffff88eee9e2 R09: ffff8882016a7d68
R10: ffff8880aea077a5 R11: 0000000000058071 R12: ffffffff88a0baa8
R13: ffffffff88a0baa8 R14: ffffffff88a0baa8 R15: dffffc0000000000
 orc_find arch/x86/kernel/unwind_orc.c:121 [inline]
 unwind_next_frame+0x5de/0x17a0 arch/x86/kernel/unwind_orc.c:348
 __save_stack_trace+0x6b/0xd0 arch/x86/kernel/stacktrace.c:44
 save_stack+0x32/0xa0 mm/kasan/kasan.c:447
 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_trace+0x137/0x7b0 mm/slab.c:3616
 kmalloc include/linux/slab.h:488 [inline]
 dst_cow_metrics_generic+0x48/0x130 net/core/dst.c:210
 ipv6_cow_metrics+0x70/0x180 net/ipv6/route.c:196
 dst_metrics_write_ptr include/net/dst.h:146 [inline]
 dst_metric_set include/net/dst.h:207 [inline]
 icmp6_dst_alloc+0x3f6/0x580 net/ipv6/route.c:1780
 ndisc_send_skb+0xc0f/0x11e0 net/ipv6/ndisc.c:463
 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677
 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3765
 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:__check_object_size+0x2/0x28a mm/usercopy.c:229
RSP: 0018:ffff8882016a7d68 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: ffff8882016a7e78 RBX: 0000000000000030 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000030 RDI: ffff8882016a7e78
RBP: 1ffff110402d4fb5 R08: 0000000000000001 R09: ffff8882016a7e78
R10: ffffed10402d4fd4 R11: ffff8882016a7ea7 R12: 0000000000000030
R13: 00000000200054c0 R14: 0000000000000005 R15: ffff8882016a7e78
 check_object_size include/linux/thread_info.h:108 [inline]
 check_copy_size include/linux/thread_info.h:139 [inline]
 copy_from_user include/linux/uaccess.h:146 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1492 [inline]
 SyS_bpf+0x143/0x2cd3 kernel/bpf/syscall.c:1477
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c889
RSP: 002b:00007fefb183bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fefb183c6d4 RCX: 000000000045c889
RDX: 0000000000000048 RSI: 00000000200054c0 RDI: 0000000000000005
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000006a R14: 00000000004c3101 R15: 000000000076bf0c