rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...0: (0 ticks this GP) idle=4c4c/0/0x1 softirq=73796/73797 fqs=5228
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:        0          0            0
rcu: 	cputime:        0          0            0   ==> 52510(ms)
rcu: 	(detected by 0, t=10502 jiffies, g=84957, q=340 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:check_preemption_disabled+0x0/0xe0
Code: c7 20 dd 4b 8c 48 c7 c6 60 dd 4b 8c eb 1c 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 41 57 41 56 53 65 8b 05 f7 fd 9b 07 65 8b 0d ec fd 9b 07 f7 c1
RSP: 0018:ffffc90000a08d50 EFLAGS: 00000046
RAX: 3be9ba32c8301548 RBX: 0000000000000006 RCX: 0000000000010003
RDX: 0000000000000001 RSI: ffffffff8e4b4175 RDI: ffffffff8c4bdd80
RBP: ffff8881604a8bc8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000141198 R12: 0000000000000001
R13: 0000000000000001 R14: ffffffff9aa4e420 R15: ffff8881604a8000
FS:  0000000000000000(0000) GS:ffff8882a8f4b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8b89eecff8 CR3: 00000001ac8f2000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lock_release+0x259/0x3c0
 _raw_spin_unlock_irqrestore+0x1b/0x80
 __hrtimer_run_queues+0x239/0xa10
 hrtimer_interrupt+0x448/0x910
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:pv_native_safe_halt+0xf/0x20
Code: ac 7e 02 e9 93 06 03 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d d3 3e 18 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc90000197e40 EFLAGS: 00000202
RAX: 0000000000fda3cb RBX: ffffffff819b5450 RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8e22f0ee RDI: ffffffff8c4bdd80
RBP: ffffc90000197f10 R08: ffff88823c6338db R09: 1ffff110478c671b
R10: dffffc0000000000 R11: ffffed10478c671c R12: 0000000000000000
R13: 1ffff1102c095000 R14: 1ffff92000032fd0 R15: dffffc0000000000
 default_idle+0x9/0x20
 default_idle_call+0x72/0xb0
 do_idle+0x2e0/0x540
 cpu_startup_entry+0x43/0x60
 start_secondary+0x101/0x110
 common_startup_64+0x13e/0x157
 </TASK>
