rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P1323
rcu: 	(detected by 1, t=10502 jiffies, g=41353, q=6420 ncpus=2)
task:aoe_tx0         state:R  running task     stack:25672 pid:1323  tgid:1323  ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <IRQ>
 sched_show_task+0x49d/0x630 kernel/sched/core.c:7901
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline]
 print_other_cpu_stall+0xf78/0x1340 kernel/rcu/tree_stall.h:681
 check_cpu_stall kernel/rcu/tree_stall.h:857 [inline]
 rcu_pending kernel/rcu/tree.c:3671 [inline]
 rcu_sched_clock_irq+0xa47/0x11b0 kernel/rcu/tree.c:2706
 update_process_times+0x235/0x2d0 kernel/time/timer.c:2473
 tick_sched_handle kernel/time/tick-sched.c:276 [inline]
 tick_nohz_handler+0x39a/0x520 kernel/time/tick-sched.c:297
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x506/0xd40 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45d/0xa90 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:handle_tx+0x3b5/0x610 drivers/net/caif/caif_serial.c:236
Code: 0f b6 04 28 84 c0 0f 85 9b 00 00 00 48 8b 44 24 18 8b 18 31 ff 89 de e8 99 39 ea fb 85 db 4c 8b 64 24 50 74 07 e8 db 34 ea fb <eb> 1f 4c 89 e7 e8 21 22 d1 02 4c 39 f0 75 46 e8 c7 34 ea fb 4c 89
RSP: 0018:ffffc9000543f778 EFLAGS: 00000293
RAX: ffffffff85d4b855 RBX: 0000000000000020 RCX: ffff8880272dbc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888035184238 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1028468251 R12: ffff888035184f30
R13: dffffc0000000000 R14: ffff88802fab9140 R15: ffff888035184fc8
 __netdev_start_xmit include/linux/netdevice.h:5248 [inline]
 netdev_start_xmit include/linux/netdevice.h:5257 [inline]
 xmit_one net/core/dev.c:3845 [inline]
 dev_hard_start_xmit+0x2f0/0x870 net/core/dev.c:3861
 __dev_queue_xmit+0x1b50/0x3b70 net/core/dev.c:4763
 dev_queue_xmit include/linux/netdevice.h:3365 [inline]
 tx+0x6b/0x190 drivers/block/aoe/aoenet.c:62
 kthread+0x1d0/0x3e0 drivers/block/aoe/aoecmd.c:1241
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>