title: What is __kernel_vsyscall?
body: <p>I got a core that looks very different from the ones I usually get - most of the threads are in __kernel_vsyscall() :</p>
  
  <pre><code>  9 process 11334  0xffffe410 in __kernel_vsyscall ()
    8 process 11453  0xffffe410 in __kernel_vsyscall ()
    7 process 11454  0xffffe410 in __kernel_vsyscall ()
    6 process 11455  0xffffe410 in __kernel_vsyscall ()
    5 process 11474  0xffffe410 in __kernel_vsyscall ()
    4 process 11475  0xffffe410 in __kernel_vsyscall ()
    3 process 11476  0xffffe410 in __kernel_vsyscall ()
    2 process 11477  0xffffe410 in __kernel_vsyscall ()
    1 process 11323  0x08220782 in MyClass::myfunc ()
  </code></pre>
  
  <p>What does that mean?</p>
  
  <p>EDIT:
  In particular, I usually see a lot of threads in "pthread_cond_wait" and "___newselect_nocancel" and now those are on the second frame in each thread - why is this core different?</p>