rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=51a/1/0x4000000000000000 softirq=81844/81845 fqs=0 
	(detected by 1, t=10502 jiffies, g=96613, q=65)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 15966 Comm: syz-executor.4 Not tainted 5.9.0-rc4-next-20200911-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:196
Code: 48 89 ef 5d e9 a1 ee 3f 00 5d be 03 00 00 00 e9 b6 ef 24 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 48 8b 14 25 c0 fe 01 00 65 8b 05 60 4e 8f 7e a9 00 01 ff 00 48
RSP: 0018:ffffc90000007df8 EFLAGS: 00000002
RAX: 0000000080010004 RBX: 0000000000000001 RCX: ffffffff8162fe70
RDX: 0000000000000001 RSI: ffff888057bb4540 RDI: 0000000000000005
RBP: ffff888092b21b40 R08: 0000000000000000 R09: ffffffff8ae5a20f
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae627740
R13: ffff8880ae627840 R14: ffffffff86522ba0 R15: dffffc0000000000
FS:  00007f454ae6d700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32a22000 CR3: 000000008fc90000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 trace_hrtimer_expire_entry include/trace/events/timer.h:232 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1521 [inline]
 __hrtimer_run_queues+0x9e9/0xea0 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x13e/0x520 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:786
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_apic_timer_interrupt+0xb2/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:csd_lock_wait kernel/smp.c:227 [inline]
RIP: 0010:smp_call_function_single+0x192/0x4f0 kernel/smp.c:512
Code: 10 8b 7c 24 1c 48 8d 74 24 40 48 89 44 24 50 48 8b 44 24 08 48 89 44 24 58 e8 4a fa ff ff 41 89 c5 eb 07 e8 90 09 0b 00 f3 90 <44> 8b 64 24 48 31 ff 41 83 e4 01 44 89 e6 e8 fb 05 0b 00 45 85 e4
RSP: 0018:ffffc900066a7c00 EFLAGS: 00000212
RAX: 00000000000000f8 RBX: 1ffff92000cd4f84 RCX: ffffc90011bc3000
RDX: 0000000000040000 RSI: ffffffff8167a680 RDI: 0000000000000005
RBP: ffffc900066a7cc8 R08: 0000000000000001 R09: ffff8880ae736fc7
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000040
 smp_call_function_many_cond+0x1a4/0x990 kernel/smp.c:648
 smp_call_function_many kernel/smp.c:711 [inline]
 smp_call_function kernel/smp.c:733 [inline]
 on_each_cpu+0x4c/0x1f0 kernel/smp.c:832
 clock_was_set+0x18/0x20 kernel/time/hrtimer.c:876
 do_settimeofday64 kernel/time/timekeeping.c:1331 [inline]
 do_settimeofday64+0x39d/0x570 kernel/time/timekeeping.c:1297
 do_sys_settimeofday64 kernel/time/time.c:195 [inline]
 do_sys_settimeofday64+0x1de/0x260 kernel/time/time.c:169
 __do_sys_clock_settime kernel/time/posix-timers.c:1079 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1067 [inline]
 __x64_sys_clock_settime+0x197/0x260 kernel/time/posix-timers.c:1067
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5f9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f454ae6cc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 0000000000001f80 RCX: 000000000045d5f9
RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000000
RBP: 000000000118cf78 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffc6769399f R14: 00007f454ae6d9c0 R15: 000000000118cf4c
rcu: rcu_preempt kthread starved for 10502 jiffies! g96613 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:28856 pid:   10 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3777 [inline]
 __schedule+0xea5/0x21b0 kernel/sched/core.c:4526
 schedule+0xcf/0x270 kernel/sched/core.c:4604
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1879
 rcu_gp_fqs_loop kernel/rcu/tree.c:1931 [inline]
 rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2105
 kthread+0x3af/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296