(gdb) info threads
  Id   Target Id         Frame
* 1    Thread 0x7ffff7fa9780 (LWP 8032) "bluealsa" 0x00007ffff6611bad in poll () from /lib64/libc.so.6
  2    Thread 0x7ffff4792700 (LWP 8036) "bactl" 0x00007ffff6611bad in poll () from /lib64/libc.so.6
  3    Thread 0x7ffff3f91700 (LWP 8037) "gmain" 0x00007ffff6611bad in poll () from /lib64/libc.so.6
  4    Thread 0x7ffff3790700 (LWP 8038) "gdbus" 0x00007ffff6611bad in poll () from /lib64/libc.so.6
  5    Thread 0x7ffff2f8f700 (LWP 8067) "baio" 0x00007ffff6611bad in poll () from /lib64/libc.so.6
(gdb) thread 5
[Switching to thread 5 (Thread 0x7ffff2f8f700 (LWP 8067))]
#0  0x00007ffff6611bad in poll () from /lib64/libc.so.6
(gdb) bt
#0  0x00007ffff6611bad in poll () from /lib64/libc.so.6
#1  0x000055555555dfd9 in io_thread_a2dp_source_sbc ()
#2  0x00007ffff68d9867 in start_thread () from /lib64/libpthread.so.0
#3  0x00007ffff661ccdf in clone () from /lib64/libc.so.6
(gdb) thread 2
[Switching to thread 2 (Thread 0x7ffff4792700 (LWP 8036))]
#0  0x00007ffff6611bad in poll () from /lib64/libc.so.6
(gdb) bt
#0  0x00007ffff6611bad in poll () from /lib64/libc.so.6
#1  0x000055555555c906 in ctl_thread ()
#2  0x00007ffff68d9867 in start_thread () from /lib64/libpthread.so.0
#3  0x00007ffff661ccdf in clone () from /lib64/libc.so.6