hrtimer: interrupt took 58656 ns
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=13a/1/0x4000000000000002 softirq=10719/10728 fqs=2 
	(t=10500 jiffies g=6925 q=327)
rcu: rcu_preempt kthread starved for 10496 jiffies! g6925 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29096    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3367 [inline]
 __schedule+0x8ae/0x19c0 kernel/sched/core.c:4083
 schedule+0xc3/0x2b0 kernel/sched/core.c:4158
 schedule_timeout+0x2bd/0x710 kernel/time/timer.c:1898
 rcu_gp_fqs_loop kernel/rcu/tree.c:1674 [inline]
 rcu_gp_kthread+0x9da/0x1a40 kernel/rcu/tree.c:1836
 kthread+0x354/0x420 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
NMI backtrace for cpu 0
CPU: 0 PID: 8118 Comm: syz-executor.3 Not tainted 5.7.0-rc7-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:77 [inline]
 dump_stack+0x12d/0x187 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold.7+0x4b/0x84 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x18b/0x1b7 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x1a1/0x1ee kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:549 [inline]
 rcu_pending kernel/rcu/tree.c:3225 [inline]
 rcu_sched_clock_irq.cold.87+0x3c7/0xc50 kernel/rcu/tree.c:2296
 update_process_times+0x23/0x50 kernel/time/timer.c:1727
 tick_sched_handle+0x77/0x140 kernel/time/tick-sched.c:176
 tick_sched_timer+0x43/0x100 kernel/time/tick-sched.c:1320
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x524/0xc00 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x2df/0x760 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline]
 smp_apic_timer_interrupt+0x163/0x5f0 arch/x86/kernel/apic/apic.c:1138
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xaa/0xd0 kernel/locking/spinlock.c:191
Code: e0 6b f4 88 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 28 48 83 3d bd f5 a3 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb ad e8 85 f5 af f9 eb bb 0f 0b 0f 0b e8 8f 6a 51
RSP: 0000:ffffc90004187d00 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000000
RDX: 1ffffffff11e8d7c RSI: 0000000000000006 RDI: 0000000000000286
RBP: ffffc90004187d10 R08: 0000000000000006 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888086c60a00
R13: 000000000000000b R14: 0000000000000000 R15: 000000000000000a
 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
 force_sig_info_to_task+0x259/0x320 kernel/signal.c:1334
 force_sig_fault_to_task kernel/signal.c:1672 [inline]
 force_sig_fault+0xad/0xe0 kernel/signal.c:1679
 __bad_area_nosemaphore+0x24d/0x310 arch/x86/mm/fault.c:927
 __bad_area arch/x86/mm/fault.c:956 [inline]
 bad_area+0x64/0x80 arch/x86/mm/fault.c:962
 do_user_addr_fault arch/x86/mm/fault.c:1427 [inline]
 do_page_fault+0xa00/0xe5b arch/x86/mm/fault.c:1535
 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203
RIP: 0033:0x4057e9
Code: d0 ff ff ff 01 48 8b 7c 24 28 c7 44 24 34 00 00 00 00 e8 4a d3 01 00 85 c0 75 23 48 6b 44 24 20 18 8b 7c 24 1c 48 03 44 24 38 <48> 8b 48 10 48 8b 50 08 48 8b 30 e8 e7 ee 00 00 89 44 24 34 64 f0
RSP: 002b:00007f332a7b1a70 EFLAGS: 00010202
RAX: 0000000024b9c1a8 RBX: 0000000000000007 RCX: 0000000000414717
RDX: ae8cfe000697c394 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 00007f332a7b1a70 R09: 000000000075bf20
R10: 0000000000000000 R11: 0000000000000000 R12: 00007f332a7b26d4
R13: 00000000004cae58 R14: 00000000004e4478 R15: 00000000ffffffff