rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10356 ticks this GP) idle=53e/1/0x4000000000000000 softirq=13216/13219 fqs=5037 
	(t=10500 jiffies g=15653 q=297)
NMI backtrace for cpu 0
CPU: 0 PID: 10754 Comm: syz-executor.1 Not tainted 5.11.0-rc5-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:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x1f4/0x230 kernel/rcu/tree_stall.h:337
 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:643 [inline]
 rcu_pending kernel/rcu/tree.c:3751 [inline]
 rcu_sched_clock_irq.cold+0x48e/0xedf kernel/rcu/tree.c:2580
 update_process_times+0x16d/0x200 kernel/time/timer.c:1782
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629
RIP: 0010:lock_release+0x3d5/0x710 kernel/locking/lockdep.c:5450
Code: 15 02 00 00 48 c7 c7 a0 aa 4b 89 e8 45 0d a1 07 b8 ff ff ff ff 65 0f c1 05 88 41 a9 7e 83 f8 01 0f 85 67 01 00 00 ff 34 24 9d <48> b8 00 00 00 00 00 fc ff df 48 01 c5 48 c7 45 00 00 00 00 00 c7
RSP: 0018:ffffc90000007b68 EFLAGS: 00000246
RAX: 0000000000000001 RBX: c1ac833be8fb24e7 RCX: ffffc90000007bb8
RDX: 1ffff110031674a7 RSI: 0000000000000100 RDI: 0000000000000000
RBP: 1ffff92000000f6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000002 R14: ffff888018b3a540 R15: ffff888018b39bc0
 rcu_lock_release include/linux/rcupdate.h:264 [inline]
 rcu_read_unlock include/linux/rcupdate.h:702 [inline]
 ipv6_get_lladdr+0x320/0x480 net/ipv6/addrconf.c:1863
 addrconf_rs_timer+0x3bc/0x820 net/ipv6/addrconf.c:3874
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417
 expire_timers kernel/time/timer.c:1462 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731
 __run_timers kernel/time/timer.c:1712 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744
 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu kernel/softirq.c:420 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629
RIP: 0010:preempt_schedule+0x7/0x20 kernel/sched/core.c:5260
Code: ff 45 31 ed e8 6a cb 5d f8 eb d6 48 89 df e8 c0 3e ba f8 eb ad e8 39 3f ba f8 eb da 0f 1f 80 00 00 00 00 65 8b 05 89 b2 06 77 <a9> ff ff ff 7f 74 01 c3 9c 58 f6 c4 02 74 f8 e9 25 ff ff ff 0f 1f
RSP: 0018:ffffc9000231f728 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000001
RBP: ffffc9000231f778 R08: 0000000000000000 R09: ffff88801269e543
R10: ffffed10024d3ca8 R11: 0000000000000000 R12: ffff88802759ae00
R13: 0000000000000000 R14: dffffc0000000000 R15: 00007f61c852d000
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40
 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:183
 spin_unlock include/linux/spinlock.h:394 [inline]
 zap_pte_range mm/memory.c:1320 [inline]
 zap_pmd_range mm/memory.c:1368 [inline]
 zap_pud_range mm/memory.c:1397 [inline]
 zap_p4d_range mm/memory.c:1418 [inline]
 unmap_page_range+0xf98/0x2640 mm/memory.c:1439
 unmap_single_vma+0x198/0x300 mm/memory.c:1484
 unmap_vmas+0x168/0x2e0 mm/memory.c:1516
 exit_mmap+0x2b1/0x5a0 mm/mmap.c:3220
 __mmput+0x122/0x470 kernel/fork.c:1082
 mmput+0x53/0x60 kernel/fork.c:1103
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xb6a/0x2ae0 kernel/exit.c:812
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x427/0x20f0 kernel/signal.c:2773
 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
Code: Unable to access opcode bytes at RIP 0x45e1ef.
RSP: 002b:00007f61c6fe7cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000119c0d8 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000119c0d8
RBP: 000000000119c0d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c0dc
R13: 00007ffd2cc9418f R14: 00007f61c6fe89c0 R15: 000000000119c0dc