title: rcu_preempt self-detected stall on CPU { 0}
body: <p>I am running an application on my intel rangeley board, which is having 3.14.29-rt22 kernel
      running on it. Application will run two threads with pri :39 each. for 1 and 2 msec periodically. 
      Both the threads will be running in continuous while loop, which will be running 
      only on core 0.
      After running sometime, around 10 min. When I press ctrl+c, it is giving logs below.</p>
  
  <pre><code>**INFO: rcu_preempt self-detected stall on CPU { 0}  (t=21000 jiffies g=2362 c=2361 q=207)**
  **sending NMI to all CPUs:
   NMI backtrace for cpu 1**
  
   CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.14.29ltsi-rt22-yocto-preempt-rt+ #1
  
   Hardware name: ADI Engineering RCC-VE/RCC-VE, BIOS ADI_RCCVE-01.00.00.04-nodebug 05/06/2015
  
  task: ffff8802761a0000 ti: ffff8802761a8000 task.ti: ffff8802761a8000
  RIP: 0010:[&lt;ffffffff8100b451&gt;]  [&lt;ffffffff8100b451&gt;]   native_read_tsc+0x1/0x20
  RSP: 0018:ffff8802761abe28  EFLAGS: 00000003
  RAX: 0000000000000000 RBX: ffffffff81e1acc0 RCX: 0000000000000000
  RDX: 0000000000000001 RSI: 0000000000000202 RDI: ffffffff81e1acc0
  RBP: ffff8802761abe38 R08: ffff8802761a8000 R09: 0000000000000001
  R10: 0000000000000800 R11: 0000000000000000 R12: 000000000000003e
  R13: 0000000000014e76 R14: ffff8802761abfd8 R15: ffff88027fc8cf00
  FS:  0000000000000000(0000) GS:ffff88027fc80000(0000)   knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  CR2: 00007fabcd23f000 CR3: 0000000269589000 CR4: 00000000001007e0
  Stack:
  ffff8802761abe38 ffffffff8100b4a9 ffff8802761abe60 ffffffff810a6b73
  0000000000000001 ffff8802761abfd8 ffffffff81edc030 ffff8802761abec0
  ffffffff810b01a5 ffffffffffffff10 ffffffff8103b906 0000000000000000
  Call Trace:
  [&lt;ffffffff8100b4a9&gt;] ? read_tsc+0x9/0x20
  [&lt;ffffffff810a6b73&gt;] ktime_get+0x43/0xc0
  [&lt;ffffffff810b01a5&gt;] __tick_nohz_idle_enter+0x25/0x480
  [&lt;ffffffff8103b906&gt;] ? native_safe_halt+0x6/0x10
  [&lt;ffffffff810b064a&gt;] tick_nohz_idle_enter+0x4a/0x80
  [&lt;ffffffff8109a626&gt;] cpu_startup_entry+0x46/0x290
  [&lt;ffffffff81031597&gt;] start_secondary+0x1b7/0x210
  </code></pre>
  
  <p>What can be the reason? Is it because I am continuously using CPU for longtime?
  When I print anything from thread on the console, this crash is not happening.</p>