(gdb) bt
#0 0x00002b27f7c9c957 in semop () from /lib/libc.so.6
#1 0x00002b27f77188e3 in snd_pcm_dmix_open () from /usr/lib/libasound.so.2
#2 0x00002b27f77192cb in _snd_pcm_dmix_open () from /usr/lib/libasound.so.2
#3 0x00002b27f76efbcf in ?? () from /usr/lib/libasound.so.2
#4 0x00002b27f76f00c8 in ?? () from /usr/lib/libasound.so.2
#5 0x00002b27f76f0122 in snd_pcm_open_slave () from /usr/lib/libasound.so.2
#6 0x00002b27f77212a4 in _snd_pcm_softvol_open () from /usr/lib/libasound.so.2
#7 0x00002b27f76efbcf in ?? () from /usr/lib/libasound.so.2
#8 0x00002b27f76f014b in snd_pcm_open_slave () from /usr/lib/libasound.so.2
#9 0x00002b27f7706960 in _snd_pcm_plug_open () from /usr/lib/libasound.so.2
#10 0x00002b27f76efbcf in ?? () from /usr/lib/libasound.so.2
#11 0x00002b27f76f014b in snd_pcm_open_slave () from /usr/lib/libasound.so.2
#12 0x00002b27f771f229 in _snd_pcm_asym_open () from /usr/lib/libasound.so.2
#13 0x00002b27f76efbcf in ?? () from /usr/lib/libasound.so.2
#14 0x00002b27f76f014b in snd_pcm_open_slave () from /usr/lib/libasound.so.2
#15 0x00002b27f770d158 in _snd_pcm_empty_open () from /usr/lib/libasound.so.2
#16 0x00002b27f76efbcf in ?? () from /usr/lib/libasound.so.2
#17 0x00002b27f76f00c8 in ?? () from /usr/lib/libasound.so.2
#18 0x0000000000408b87 in ?? ()
#19 0x00002b27f7bfd134 in __libc_start_main () from /lib/libc.so.6
#20 0x0000000000403529 in ?? ()
#21 0x00007fffb35245d8 in ?? ()
#22 0x0000000000000000 in ?? ()