rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=7f6/1/0x4000000000000000 softirq=105569/105569 fqs=0 
	(detected by 1, t=10502 jiffies, g=201909, q=568)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7282 Comm: syz-executor.5 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:lock_acquire+0xa2/0xad0 kernel/locking/lockdep.c:4934
Code: 08 00 00 00 f3 c7 40 0c f3 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 84 24 b8 00 00 00 31 c0 48 89 f8 48 c1 e8 03 0f b6 0c 08 <48> 89 f8 83 e0 07 83 c0 03 38 c8 7c 08 84 c9 0f 85 61 07 00 00 45
RSP: 0018:ffffc90000007bb0 EFLAGS: 00000807
RAX: 1ffff1100b6f2969 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88805b794b4c
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8cb9c340 R14: 0000000000000000 R15: ffff88805b794280
FS:  0000000000d5b940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000ca3b72 CR3: 000000005b783000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:159
 debug_object_activate+0x12e/0x3e0 lib/debugobjects.c:636
 debug_hrtimer_activate kernel/time/hrtimer.c:416 [inline]
 debug_activate kernel/time/hrtimer.c:476 [inline]
 enqueue_hrtimer+0x27/0x3f0 kernel/time/hrtimer.c:965
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0xc1e/0xfc0 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </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+0xe0/0x120 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:585
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4b/0x80 kernel/locking/spinlock.c:199
Code: c0 98 e0 b4 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d f6 78 cc 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 fb 0a 67 f9 65 8b 05 04 97 19 78 85 c0 74 02 5d
RSP: 0018:ffffc90007a7fb48 EFLAGS: 00000286
RAX: 1ffffffff1369c13 RBX: ffff88805b794280 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff87e8677f
RBP: ffff8880ae635e00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880ae635e00
R13: ffff888066806180 R14: 0000000000000000 R15: 0000000000000000
 finish_lock_switch kernel/sched/core.c:3197 [inline]
 finish_task_switch+0x147/0x750 kernel/sched/core.c:3297
 context_switch kernel/sched/core.c:3461 [inline]
 __schedule+0x927/0x2250 kernel/sched/core.c:4215
 schedule+0xd0/0x2a0 kernel/sched/core.c:4290
 freezable_schedule include/linux/freezer.h:172 [inline]
 do_nanosleep+0x222/0x650 kernel/time/hrtimer.c:1879
 hrtimer_nanosleep+0x1f6/0x430 kernel/time/hrtimer.c:1932
 __do_sys_nanosleep kernel/time/hrtimer.c:1966 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:1953 [inline]
 __x64_sys_nanosleep+0x1dc/0x260 kernel/time/hrtimer.c:1953
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45a870
Code: Bad RIP value.
RSP: 002b:00007ffeeb4ef2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 000000000012d605 RCX: 000000000045a870
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffeeb4ef300
RBP: 0000000000001014 R08: 0000000000000001 R09: 0000000000d5b940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffeeb4ef350 R14: 000000000012d5d7 R15: 00007ffeeb4ef360
rcu: rcu_preempt kthread starved for 10502 jiffies! g201909 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:
rcu_preempt     I29112    10      2 0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x91f/0x2250 kernel/sched/core.c:4215
 schedule+0xd0/0x2a0 kernel/sched/core.c:4290
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1908
 rcu_gp_fqs_loop kernel/rcu/tree.c:1874 [inline]
 rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2044
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293