I just updated to latest master (FreeSWITCH Version 1.5.13b+git~20140624T011034Z~6540068faa~64bit (git 6540068 2014-06-24 01:10:34Z 64bit)
2014-06-24 12:33:27.718143 [WARNING] switch_core_file.c:230 File has 2 channels, muxing to 1 channel will occur.
2014-06-24 12:33:27.758501 [WARNING] switch_core_file.c:230 File has 2 channels, muxing to 1 channel will occur.
2014-06-24 12:33:28.278490 [WARNING] switch_core_file.c:230 File has 2 channels, muxing to 1 channel will occur.
2014-06-24 12:33:28.758191 [WARNING] switch_core_file.c:230 File has 2 channels, muxing to 1 channel will occur.
2014-06-24 12:33:29.718179 [WARNING] switch_core_file.c:230 File has 2 channels, muxing to 1 channel will occur.
2014-06-24 12:33:29.758117 [WARNING] switch_core_file.c:230 File has 2 channels, muxing to 1 channel will occur.
2014-06-24 12:33:30.278168 [WARNING] switch_core_file.c:230 File has 0 channels, muxing to 1 channel will occur.
Floating point exception (core dumped)
And this in the kernel log:
Jun 24 12:33:30 kernel: [318729.760849] freeswitch[5258] trap divide error ip:7ff154c9306a sp:7ff12b803a00 error:0 in libfreeswitch.so.1.0.0[7ff154c28000+1d8000]