rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1):
------------[ cut here ]------------
WARNING: CPU: 1 PID: 22171 at kernel/sched/core.c:3014 try_invoke_on_locked_down_task+0x18c/0x300 kernel/sched/core.c:3014
Modules linked in:
CPU: 1 PID: 22171 Comm: syz-executor.0 Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:try_invoke_on_locked_down_task+0x18c/0x300 kernel/sched/core.c:3014
Code: 00 00 00 0f 85 34 01 00 00 48 83 c4 70 44 89 f0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b 05 68 74 b5 7e 85 c0 0f 85 15 ff ff ff <0f> 0b e9 0e ff ff ff 48 8d 74 24 30 48 89 ef 49 c7 c6 80 49 03 00
RSP: 0018:ffffc90000d90500 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 1ffff920001b20a2 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff815cb060 RDI: ffff88805fb33480
RBP: ffff88805fb33480 R08: 0000000000000000 R09: ffffffff8b33f983
R10: fffffbfff1667f30 R11: 0000000000000001 R12: ffffffff815cb060
R13: ffffc90000d90620 R14: ffffffff8b33fa40 R15: ffffffff8b33f980
FS:  0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cc73c2e160 CR3: 00000000110e0000 CR4: 0000000000350ee0
Call Trace:
 <IRQ>
 rcu_print_task_stall kernel/rcu/tree_stall.h:278 [inline]
 print_other_cpu_stall kernel/rcu/tree_stall.h:495 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:646 [inline]
 rcu_pending kernel/rcu/tree.c:3694 [inline]
 rcu_sched_clock_irq.cold+0xa44/0xee8 kernel/rcu/tree.c:2567
 update_process_times+0x77/0xd0 kernel/time/timer.c:1709
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097
 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:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:do_csum+0x1ec/0x400 arch/x86/lib/csum-partial_64.c:91
Code: 04 24 e8 67 4f 9c fd 45 85 f6 74 32 45 89 f5 4d 89 e6 e8 07 57 9c fd 41 83 ed 01 31 ff 31 c0 44 89 ee 49 83 c6 08 49 03 5e f8 <48> 11 c3 e8 3c 4f 9c fd 45 85 ed 75 db 8b 04 24 4d 8d 24 c4 e8 db
RSP: 0018:ffffc90000d90a30 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000085 RCX: ffffffff83d3ad59
RDX: ffff888073601a40 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88805e2de838
R13: 0000000000000001 R14: ffff88805e2de840 R15: 0000000000000000
 csum_partial+0x1c/0x30 arch/x86/lib/csum-partial_64.c:136
 ndisc_send_skb+0x277/0x1720 net/ipv6/ndisc.c:497
 ndisc_send_rs+0x12e/0x700 net/ipv6/ndisc.c:702
 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3873
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1410
 expire_timers kernel/time/timer.c:1455 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747
 __run_timers kernel/time/timer.c:1728 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760
 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298
 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:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x132/0x200 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x25/0x50 kernel/locking/spinlock.c:191
Code: f8 5d c3 66 90 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 ca 28 6e f8 48 89 ef e8 52 dd 6e f8 f6 c7 02 75 1a 53 9d <bf> 01 00 00 00 e8 61 49 63 f8 65 8b 05 8a f3 19 77 85 c0 74 0a 5b
RSP: 0018:ffffc90002297358 EFLAGS: 00000216
RAX: 00000000018244c7 RBX: 0000000000000216 RCX: 1ffffffff19d8e91
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffffff8f162ba0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88801378c848
R13: 1ffff92000452e7d R14: ffffffff8f162ba0 R15: ffffffff8f162b98
 __debug_object_init+0x409/0xd10 lib/debugobjects.c:600
 debug_object_init lib/debugobjects.c:615 [inline]
 debug_object_activate+0x32c/0x3e0 lib/debugobjects.c:701
 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline]
 __call_rcu kernel/rcu/tree.c:2939 [inline]
 call_rcu+0x2c/0x700 kernel/rcu/tree.c:3027
 put_task_struct_rcu_user+0x7f/0xb0 kernel/exit.c:178
 finish_task_switch+0x548/0x7a0 kernel/sched/core.c:3652
 context_switch kernel/sched/core.c:3782 [inline]
 __schedule+0x89b/0x2130 kernel/sched/core.c:4528
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:4687
 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:1309 [inline]
 zap_pmd_range mm/memory.c:1357 [inline]
 zap_pud_range mm/memory.c:1386 [inline]
 zap_p4d_range mm/memory.c:1407 [inline]
 unmap_page_range+0xf98/0x2640 mm/memory.c:1428
 unmap_single_vma+0x198/0x300 mm/memory.c:1473
 unmap_vmas+0x168/0x2e0 mm/memory.c:1505
 exit_mmap+0x2b1/0x530 mm/mmap.c:3220
 __mmput+0x122/0x470 kernel/fork.c:1079
 mmput+0x53/0x60 kernel/fork.c:1100
 exit_mm kernel/exit.c:486 [inline]
 do_exit+0xa72/0x29b0 kernel/exit.c:796
 do_group_exit+0x125/0x310 kernel/exit.c:906
 get_signal+0x42a/0x1f10 kernel/signal.c:2758
 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x460fba
Code: Unable to access opcode bytes at RIP 0x460f90.
RSP: 002b:00007f870ddc3c48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4
RAX: 0000000000000000 RBX: ffffffffffffffff RCX: 0000000000460fba
RDX: 000000000000892b RSI: 00007f870ddc3c50 RDI: 0000000000000001
RBP: 00000000004d70c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009
R13: 00007ffc454b8fcf R14: 000000000119bf80 R15: 000000000119bf8c