rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=11e/1/0x4000000000000000 softirq=86250/86250 fqs=2 
	(detected by 1, t=10502 jiffies, g=155181, q=47)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6843 Comm: syz-executor.1 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 arch/x86/include/asm/paravirt.h:787 [inline]
RIP: 0010:lock_release+0x126/0x8f0 kernel/locking/lockdep.c:5022
Code: b6 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 13 07 00 00 48 83 3d 22 d6 5b 08 00 0f 84 15 05 00 00 9c 58 <0f> 1f 44 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 04 24 48 c7 c0
RSP: 0018:ffffc90000007d08 EFLAGS: 00000082
RAX: 0000000000000082 RBX: ffff888090f562c0 RCX: 1ffffffff1308b20
RDX: dffffc0000000000 RSI: ffffffff89bd6980 RDI: ffff888090f56ba4
RBP: 1ffff92000000fa3 R08: 0000000000000000 R09: 0000000000000000
R10: fffffbfff1564d71 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8880ae627758 R14: ffffffff81649151 R15: dffffc0000000000
FS:  00000000023b1940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f822000 CR3: 0000000072238000 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:158 [inline]
 _raw_spin_unlock_irqrestore+0x16/0x90 kernel/locking/spinlock.c:191
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x5d1/0xfc0 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:lock_acquire+0x27b/0xae0 kernel/locking/lockdep.c:5009
Code: ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 04 07 00 00 48 83 3d e8 cb 5b 08 00 0f 84 5a 05 00 00 4c 89 ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 08 48 c7
RSP: 0018:ffffc90002b37cd0 EFLAGS: 00000282
RAX: 1ffffffff136c789 RBX: ffff888090f562c0 RCX: ffffffff815a184b
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000282
RBP: ffff8880a1b89228 R08: 0000000000000000 R09: ffffffff8c5f59ff
R10: fffffbfff18beb3f R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000282
 __might_fault mm/memory.c:4870 [inline]
 __might_fault+0x152/0x1d0 mm/memory.c:4855
 _copy_from_user+0x29/0x190 lib/usercopy.c:12
 copy_from_user include/linux/uaccess.h:160 [inline]
 get_timespec64+0x75/0x220 kernel/time/time.c:787
 __do_sys_nanosleep kernel/time/hrtimer.c:1962 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:1957 [inline]
 __x64_sys_nanosleep+0xaa/0x260 kernel/time/hrtimer.c:1957
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ba81
Code: 75 14 b8 23 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 84 cf fb ff c3 48 83 ec 08 e8 ea 46 00 00 48 89 04 24 b8 23 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 33 47 00 00 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fffc4449ca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 00000000000e424b RCX: 000000000045ba81
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fffc4449cb0
RBP: 0000000000000b0e R08: 0000000000000000 R09: 00000000023b1940
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fffc4449d00 R14: 00000000000e424b R15: 00007fffc4449d10
rcu: rcu_preempt kthread starved for 10498 jiffies! g155181 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:29216 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