rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (2 ticks this GP) idle=112/1/0x4000000000000000 softirq=9224/9224 fqs=0 
	(t=28715 jiffies g=4017 q=4388)
rcu: rcu_preempt kthread starved for 28715 jiffies! g4017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
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:I stack:14328 pid:   12 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4327 [inline]
 __schedule+0x420/0x900 kernel/sched/core.c:5078
 schedule+0x38/0xe0 kernel/sched/core.c:5157
 schedule_timeout+0x1be/0x2e0 kernel/time/timer.c:1878
 rcu_gp_fqs_loop kernel/rcu/tree.c:1940 [inline]
 rcu_gp_kthread+0x758/0xcc0 kernel/rcu/tree.c:2113
 kthread+0x145/0x170 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
NMI backtrace for cpu 0
CPU: 0 PID: 7379 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+0xa3/0xc8 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold.8+0x53/0x6d lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0xd5/0xf0 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0xa2/0xce 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.97+0x61/0x5eb kernel/rcu/tree.c:2580
 update_process_times+0x8e/0xc0 kernel/time/timer.c:1782
 tick_sched_handle.isra.21+0x1a/0x50 kernel/time/tick-sched.c:226
 tick_sched_timer+0x6a/0x80 kernel/time/tick-sched.c:1369
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1e3/0x4f0 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0xf9/0x210 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x8e/0x290 arch/x86/kernel/apic/apic.c:1102
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
 sysvec_apic_timer_interrupt+0xcc/0xf0 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629
RIP: 0010:csd_lock_wait kernel/smp.c:227 [inline]
RIP: 0010:smp_call_function_single+0xca/0x1b0 kernel/smp.c:512
Code: 00 85 db 0f 84 99 00 00 00 48 89 e6 44 89 e7 4c 89 74 24 10 4c 89 6c 24 18 e8 52 fe ff ff 89 c3 8b 44 24 08 a8 01 74 0b f3 90 <8b> 54 24 08 83 e2 01 75 f5 bf 01 00 00 00 e8 b3 7b f7 ff 65 8b 15
RSP: 0018:ffffc90002173e00 EFLAGS: 00000202
RAX: 0000000000000011 RBX: 0000000000000000 RCX: 0000000000000830
RDX: 0000000000000001 RSI: 00000000000000fb RDI: 0000000000000830
RBP: ffffc90002173e68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000000 R14: ffffffff81271b80 R15: 0000000000000282
 smp_call_function_many kernel/smp.c:711 [inline]
 smp_call_function+0x34/0x60 kernel/smp.c:733
 on_each_cpu+0x23/0xa0 kernel/smp.c:832
 clock_was_set+0x13/0x20 kernel/time/hrtimer.c:871
 do_settimeofday64+0x179/0x210 kernel/time/timekeeping.c:1326
 __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+0x64/0xb0 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: 0033:0x45cba9
Code: 8d b6 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 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f917e096c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00000000004db5e0 RCX: 000000000045cba9
RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000000
RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000007b R14: 00000000004c352c R15: 00007f917e0976d4