1. Thread 30 (Thread 0x7f95c434e700 (LWP 10674)):
2. #0  0x00007f96108e753d in read () from /lib64/libpthread.so.0
3. #1  0x00007f9616c4061e in _timerfd_next (timer=0x7f9604232308) at src/switch_time.c:474
4. #2  timer_next (timer=0x7f9604232308) at src/switch_time.c:838
5. #3  0x00007f9616b74f98 in switch_core_timer_next (timer=timer@entry=0x7f9604232308) at src/switch_core_timer.c:74
6. #4  0x00007f95c43cbb74 in read_stream_thread (thread=<optimized out>, obj=0x7f9604231d78) at mod_local_stream.c:445
7. #5  0x00007f9616e98b00 in dummy_worker (opaque=0x7f9604232e90) at threadproc/unix/thread.c:151
8. #6  0x00007f96108de684 in start_thread () from /lib64/libpthread.so.0
9. #7  0x00007f960ff3defd in clone () from /lib64/libc.so.6
10.  
11. Thread 29 (Thread 0x7f95c4312700 (LWP 10673)):
12. #0  0x00007f96108e753d in read () from /lib64/libpthread.so.0
13. #1  0x00007f9616c4061e in _timerfd_next (timer=0x7f960422e2e8) at src/switch_time.c:474
14. #2  timer_next (timer=0x7f960422e2e8) at src/switch_time.c:838
15. #3  0x00007f9616b74f98 in switch_core_timer_next (timer=timer@entry=0x7f960422e2e8) at src/switch_core_timer.c:74
16. #4  0x00007f95c43cbb74 in read_stream_thread (thread=<optimized out>, obj=0x7f960422dd58) at mod_local_stream.c:445
17. #5  0x00007f9616e98b00 in dummy_worker (opaque=0x7f960422ebf0) at threadproc/unix/thread.c:151
18. #6  0x00007f96108de684 in start_thread () from /lib64/libpthread.so.0
19. #7  0x00007f960ff3defd in clone () from /lib64/libc.so.6
20.  
21. Thread 28 (Thread 0x7f95c43c6700 (LWP 10672)):
22. #0  0x00007f960ff34083 in select () from /lib64/libc.so.6
23. #1  0x00007f9616e9a075 in apr_sleep (t=<optimized out>) at time/unix/time.c:246
24. #2  0x00007f9616c3f72c in do_sleep (t=<optimized out>) at src/switch_time.c:164
25. #3  0x00007f95c43cb798 in read_stream_thread (thread=<optimized out>, obj=0x7f9604229d38) at mod_local_stream.c:303
26. #4  0x00007f9616e98b00 in dummy_worker (opaque=0x7f960422aa90) at threadproc/unix/thread.c:151
27. #5  0x00007f96108de684 in start_thread () from /lib64/libpthread.so.0
28. #6  0x00007f960ff3defd in clone () from /lib64/libc.so.6
29.  
30. Thread 27 (Thread 0x7f95c438a700 (LWP 10671)):
31. #0  0x00007f96108e753d in read () from /lib64/libpthread.so.0
32. #1  0x00007f9616c4061e in _timerfd_next (timer=0x7f96042262a8) at src/switch_time.c:474
33. #2  timer_next (timer=0x7f96042262a8) at src/switch_time.c:838
34. #3  0x00007f9616b74f98 in switch_core_timer_next (timer=timer@entry=0x7f96042262a8) at src/switch_core_timer.c:74
35. #4  0x00007f95c43cbb74 in read_stream_thread (thread=<optimized out>, obj=0x7f9604225d18) at mod_local_stream.c:445
36. #5  0x00007f9616e98b00 in dummy_worker (opaque=0x7f9604226a70) at threadproc/unix/thread.c:151
37. #6  0x00007f96108de684 in start_thread () from /lib64/libpthread.so.0
38. #7  0x00007f960ff3defd in clone () from /lib64/libc.so.6
39.