INFO: rcu_preempt self-detected stall on CPU
	1-...: (10499 ticks this GP) idle=562/140000000000002/0 softirq=110906/110906 fqs=39 
	 (t=10500 jiffies g=31436 c=31435 q=1243)
NMI backtrace for cpu 1
CPU: 1 PID: 26589 Comm: syz-executor.2 Not tainted 4.14.180-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:unwind_next_frame+0xb7/0x17a0 arch/x86/kernel/unwind_orc.c:336
RSP: 0018:ffff8880aeb077e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: ffff8880aeb07c80 RBX: ffff8880aeb07890 RCX: 0000000000000005
RDX: 1ffff11015d60f19 RSI: ffffffff850c78d1 RDI: ffff8880aeb07890
RBP: 1ffff11015d60f03 R08: 0000000000000001 R09: ffff8880aeb07c00
R10: ffff8880aeb078c5 R11: 0000000000058071 R12: 0000000000000000
R13: ffff8880aeb078c8 R14: ffff888041dd0040 R15: 0000000000000002
 __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_node mm/slab.c:3333 [inline]
 kmem_cache_alloc_node+0x135/0x7a0 mm/slab.c:3640
 __alloc_skb+0x9a/0x4c0 net/core/skbuff.c:193
 alloc_skb include/linux/skbuff.h:980 [inline]
 mrp_pdu_init net/802/mrp.c:303 [inline]
 mrp_pdu_append_vecattr_event+0x6f1/0xfa0 net/802/mrp.c:402
 mrp_attr_event+0x151/0x1e0 net/802/mrp.c:497
 mrp_mad_event+0x47/0x60 net/802/mrp.c:577
 mrp_join_timer+0x2f/0x80 net/802/mrp.c:594
 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:prepend_path.isra.0+0x4be/0xd10 fs/dcache.c:3178
RSP: 0018:ffff888052247790 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 1ffff11042be1604 RBX: ffff8880a6b634a0 RCX: ffffc90006270000
RDX: 000000000001f5ce RSI: ffffffff81903c02 RDI: 0000000000000212
RBP: ffff888215f0b020 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888215f0b000
R13: 0000000000000212 R14: ffff8880a6b71600 R15: dffffc0000000000
 path_with_deleted fs/dcache.c:3297 [inline]
 d_path+0x4bc/0x830 fs/dcache.c:3354
 seq_path+0x10e/0x270 fs/seq_file.c:468
 show_numa_map.isra.0+0x251/0xa70 fs/proc/task_mmu.c:1808
 seq_read+0xaa7/0x1160 fs/seq_file.c:272
 do_loop_readv_writev fs/read_write.c:695 [inline]
 do_loop_readv_writev fs/read_write.c:682 [inline]
 do_iter_read+0x3e3/0x5a0 fs/read_write.c:919
 vfs_readv+0xd3/0x130 fs/read_write.c:981
 do_readv+0xfc/0x2c0 fs/read_write.c:1014
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45ca29
RSP: 002b:00007fe1ddc40c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00000000004fb2c0 RCX: 000000000045ca29
RDX: 0000000000000001 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000892 R14: 00000000004cb458 R15: 00007fe1ddc416d4