rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P29
rcu: 	(detected by 1, t=10502 jiffies, g=147909, q=6352 ncpus=2)
task:ktimers/1       state:R  running task     stack:20600 pid:29    tgid:29    ppid:2      task_flags:0x4208040 flags:0x00080000
Call Trace:
 <IRQ>
 sched_show_task+0x4aa/0x5f0 kernel/sched/core.c:8140
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline]
 print_other_cpu_stall+0xfca/0x1380 kernel/rcu/tree_stall.h:681
 check_cpu_stall kernel/rcu/tree_stall.h:856 [inline]
 rcu_pending kernel/rcu/tree.c:3679 [inline]
 rcu_sched_clock_irq+0x939/0x1050 kernel/rcu/tree.c:2716
 update_process_times+0x234/0x2d0 kernel/time/timer.c:2475
 tick_sched_handle kernel/time/tick-sched.c:298 [inline]
 tick_nohz_handler+0x42b/0x770 kernel/time/tick-sched.c:319
 __run_hrtimer kernel/time/hrtimer.c:1930 [inline]
 __hrtimer_run_queues+0x3bc/0xb10 kernel/time/hrtimer.c:1994
 hrtimer_interrupt+0x455/0x950 kernel/time/hrtimer.c:2113
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rtlock_slowlock kernel/locking/rtmutex.c:1911 [inline]
RIP: 0010:rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
RIP: 0010:__rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
RIP: 0010:rt_spin_lock+0x127/0x400 kernel/locking/spinlock_rt.c:57
Code: c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 c1 ee 0b f7 49 83 3c 24 00 0f 85 01 02 00 00 48 89 5c 24 18 66 42 c7 44 2b 04 00 00 <48> c7 44 24 40 01 00 00 00 49 8d 5f 08 49 89 dc 49 c1 ec 03 43 80
RSP: 0018:ffffc90000a3fa20 EFLAGS: 00000246
RAX: 1ffff11003b54917 RBX: 1ffff92000147f48 RCX: 0000000000000046
RDX: 0000000000000200 RSI: ffffffff8d865a8e RDI: ffffffff8ba75860
RBP: ffffc90000a3fae0 R08: ffffffff89309d5a R09: ffff88805790f400
R10: dffffc0000000000 R11: ffffffff89309ca0 R12: ffff88801daa48b8
R13: dffffc0000000000 R14: ffff88805790f3a8 R15: ffffc90000a3fa60
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 advance_sched+0xba/0xc20 net/sched/sch_taprio.c:930
 __run_hrtimer kernel/time/hrtimer.c:1930 [inline]
 __hrtimer_run_queues+0x405/0xb10 kernel/time/hrtimer.c:1994
 hrtimer_run_softirq+0x18f/0x260 kernel/time/hrtimer.c:2011
 handle_softirqs+0x1de/0x6d0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 run_ktimerd+0x69/0x100 kernel/softirq.c:1151
 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>