rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=d56/1/0x4000000000000000 softirq=42153/42154 fqs=444 
	(detected by 1, t=10502 jiffies, g=72057, q=2259)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 20179 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:pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:559 [inline]
RIP: 0010:queued_spin_unlock arch/x86/include/asm/qspinlock.h:56 [inline]
RIP: 0010:do_raw_spin_unlock+0x147/0x230 kernel/locking/spinlock_debug.c:139
Code: c1 ea 03 0f b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 92 00 00 00 48 c7 c0 78 bc d6 89 c7 45 08 ff ff ff ff <48> ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 b7 00
RSP: 0018:ffffc90000007ce0 EFLAGS: 00000046
RAX: ffffffff89d6bc78 RBX: 0000000000000082 RCX: ffffffff815a0ee0
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff8cfc78e8
RBP: ffffffff8cfc78e8 R08: 0000000000000000 R09: ffffffff8cfc78eb
R10: fffffbfff19f8f1d R11: 0000000000000000 R12: ffffffff8cfc78f0
R13: ffffffff8cfc78f8 R14: 1ffff92000000fa5 R15: ffff8880a15b5340
FS:  00007fe81993b700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000180 CR3: 0000000045c76000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:159 [inline]
 _raw_spin_unlock_irqrestore+0x1e/0x90 kernel/locking/spinlock.c:191
 debug_object_deactivate lib/debugobjects.c:732 [inline]
 debug_object_deactivate+0x264/0x300 lib/debugobjects.c:698
 debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline]
 debug_deactivate kernel/time/hrtimer.c:486 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1492 [inline]
 __hrtimer_run_queues+0x3c0/0xea0 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:653 [inline]
RIP: 0010:on_each_cpu+0x143/0x1f0 kernel/smp.c:835
Code: 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 aa 00 00 00 48 83 3d f1 fd 6e 08 00 74 6b e8 f2 f2 0a 00 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 2e da e6 ff 31 ff 65 8b 1d 45 41
RSP: 0018:ffffc90005507b68 EFLAGS: 00000212
RAX: 00000000000004e3 RBX: 0000000000000212 RCX: ffffc9001199a000
RDX: 0000000000040000 RSI: ffffffff8167bd1e RDI: 0000000000000212
RBP: ffffffff8162d7d0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000200 R14: 003b9aca00000000 R15: 0000000000000000
 clock_was_set+0x18/0x20 kernel/time/hrtimer.c:876
 timekeeping_inject_offset+0x436/0x570 kernel/time/timekeeping.c:1379
 do_adjtimex+0x28f/0xa30 kernel/time/timekeeping.c:2406
 do_clock_adjtime kernel/time/posix-timers.c:1109 [inline]
 __do_sys_clock_adjtime+0x155/0x250 kernel/time/posix-timers.c:1121
 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:00007fe81993ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 0000000000001e80 RCX: 000000000045d5f9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 000000000118cf78 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffc22ed289f R14: 00007fe81993b9c0 R15: 000000000118cf4c
rcu: rcu_preempt kthread starved for 9607 jiffies! g72057 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:29440 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