rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=012/1/0x4000000000000000 softirq=48693/48694 fqs=1 
	(detected by 1, t=10502 jiffies, g=85305, q=44)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12432 Comm: syz-executor.3 Not tainted 5.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:765 [inline]
RIP: 0010:arch_local_irq_save+0x13/0x90 arch/x86/include/asm/paravirt.h:787
Code: 10 4c 8b 04 24 e9 a0 fd ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 48 c7 c0 40 3c b6 89 41 54 48 ba 00 00 00 00 00 fc ff df <48> c1 e8 03 80 3c 10 00 75 4a 48 83 3d db b3 5c 08 00 74 3c 9c 58
RSP: 0018:ffffc90000007c78 EFLAGS: 00000046
RAX: ffffffff89b63c40 RBX: 0000000000000000 RCX: 1ffffffff1308b20
RDX: dffffc0000000000 RSI: 00000000ffffffff RDI: ffffffff89bd6980
RBP: ffff88809be5a100 R08: 0000000000000000 R09: ffffffff8ab26c0f
R10: fffffbfff1564d81 R11: 0000000000000000 R12: ffffffff89bd6980
R13: ffff88809be5a9e8 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000002f8d940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000744138 CR3: 000000004c91a000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_is_held_type+0x3a/0xf0 kernel/locking/lockdep.c:5041
 lock_is_held include/linux/lockdep.h:267 [inline]
 rcu_read_lock_sched_held+0x3a/0xb0 kernel/rcu/update.c:136
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x82a/0xae0 kernel/locking/lockdep.c:4980
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
 _raw_spin_lock_irq+0x94/0xd0 kernel/locking/spinlock.c:167
 __run_hrtimer kernel/time/hrtimer.c:1528 [inline]
 __hrtimer_run_queues+0x252/0xfc0 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+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </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:581
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x4d/0x90 kernel/locking/spinlock.c:191
Code: 48 c7 c0 48 3c b6 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 3c 48 83 3d 62 07 bf 01 00 74 29 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 44 80 58 f9 65 8b 05 7d c9 0a 78
RSP: 0018:ffffc90006137c38 EFLAGS: 00000282
RAX: 1ffffffff136c789 RBX: 0000000000000282 RCX: 1ffffffff15645f9
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000282
RBP: ffff8880a91f6360 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90006137d20
R13: 0000000000000004 R14: 00007fff380ad860 R15: 0000000000000000
 do_wait+0x19d/0x9e0 kernel/exit.c:1432
 kernel_wait4+0x14c/0x260 kernel/exit.c:1621
 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1649
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x41723b
Code: 54 55 41 89 d4 53 48 89 f5 89 fb 48 83 ec 10 e8 1b f9 ff ff 45 31 d2 41 89 c0 49 63 d4 48 89 ee 48 63 fb b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 19 44 89 c7 89 44 24 0c e8 51 f9 ff ff 8b 44
RSP: 002b:00007fff380ad800 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 000000000041723b
RDX: 0000000040000001 RSI: 00007fff380ad860 RDI: ffffffffffffffff
RBP: 00007fff380ad860 R08: 0000000000000000 R09: 0000000002f8d940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000040000001
R13: 00007fff380ad860 R14: 00000000000ac87a R15: 00007fff380ad870
rcu: rcu_preempt kthread starved for 10500 jiffies! g85305 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:29088 pid:   10 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3778 [inline]
 __schedule+0xea9/0x2230 kernel/sched/core.c:4527
 schedule+0xd0/0x2a0 kernel/sched/core.c:4602
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1879
 rcu_gp_fqs_loop kernel/rcu/tree.c:1888 [inline]
 rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2058
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294