rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...0: (1 GPs behind) idle=9b1c/0/0x1 softirq=174868/174869 fqs=2100
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:        0          0            0
rcu: 	cputime:        0          0            0   ==> 52500(ms)
rcu: 	(detected by 1, t=10505 jiffies, g=199397, q=1724 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 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+0x1c/0xd0
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 53 65 8b 05 4b be b1 07 65 48 8b 0d 1b be b1 07 85 c9 74 0c 5b 41 5e <41> 5f 5d c3 cc cc cc cc cc 9c 59 f7 c1 00 02 00 00 74 ea 65 4c 8b
RSP: 0000:ffffc90000007cd8 EFLAGS: 00000006
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 8000000001000003
RDX: 0000000000000000 RSI: ffffffff8c6d6d60 RDI: ffffffff8c6d6d20
RBP: ffffffff81b41966 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff20f4190 R12: 0000000000000000
R13: ffff888121028298 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818d6e6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d214ff8 CR3: 000000000eb48000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 rcu_is_watching+0x16/0xb0
 lock_acquire+0x5f/0x350
 _raw_spin_lock_irq+0x3d/0x50
 __hrtimer_run_queues+0x466/0xa10
 hrtimer_interrupt+0x4cd/0xaa0
 __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: 7c 92 02 c3 cc cc cc cc 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 c0 27 00 fb f4 <e9> 4c 0b 03 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0000:ffffffff8ea07ca0 EFLAGS: 00000206
RAX: 0000000000c3e3b1 RBX: ffffffff819b9c40 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e472e42 RDI: ffffffff8c6d6d80
RBP: ffffffff8ea07d78 R08: ffff888121033a1b R09: 1ffff11024206743
R10: dffffc0000000000 R11: ffffed1024206744 R12: 0000000000000000
R13: 1ffffffff1d51df0 R14: 1ffffffff1d40f9c R15: dffffc0000000000
 default_idle+0x9/0x20
 default_idle_call+0x72/0xb0
 do_idle+0x2e0/0x540
 cpu_startup_entry+0x43/0x60
 rest_init+0x378/0x3a0
 start_kernel+0x392/0x3e0
 x86_64_start_reservations+0x24/0x30
 x86_64_start_kernel+0x137/0x1b0
 common_startup_64+0x13e/0x157
 </TASK>
