i tested latest master with jitsi and got a crash from ivr play app
immediately after sems had received ack and was about to start playing
audio:

...
Mar 18 18:50:26 sars sems[20150]: [#b5884b70] [setRAddr, AmRtpStream.cpp:446] 
DEBUG:  RTP remote address set to 192.98.102.31:(63759/0)
Mar 18 18:50:26 sars sems[20150]: [#b5884b70] [handleSymmetricRtp, 
AmRtpStream.cpp:498] DEBUG:  Symmetric RTP: setting new remote address: 
192.98.102.31:63759
Mar 18 18:50:26 sars sems[20150]: [#b5884b70] [write, AmPlayoutBuffer.cpp:69] 
DEBUG:  initialized recv_offset with 4283467456 (11500320 - 480)
Mar 18 18:50:26 sars sems[20150]: [#b5884b70] [receive, AmRtpAudio.cpp:234] 
DEBUG:  switching to active-mode#011(ts=480;stream=0x95e8788)
Mar 18 18:50:26 sars sems[20150]: [#b5884b70] [setCurrentPayload, 
AmRtpAudio.cpp:48] DEBUG:  fmt.codec_id = 1
Mar 18 18:50:26 sars sems[20150]: [#b5884b70] [setCurrentPayload, 
AmRtpAudio.cpp:51] DEBUG:  fmt.rate = 8000
Mar 18 18:50:26 sars sems[20150]: [#b5884b70] [setCurrentPayload, 
AmRtpAudio.cpp:53] DEBUG:  fmt.advertized_rate = 8000
Mar 18 18:50:26 sars sems[20150]: [#b5884b70] [write, AmPlayoutBuffer.cpp:80] 
DEBUG:  resync needed: reference ts = 11501760; write ts = 1526844816
Mar 18 18:50:26 sars sems[20150]: [#b5884b70] [conceal_loss, 
AmRtpAudio.cpp:402] DEBUG:  default PLC (ts_diff = 960; s = 1920)
Mar 18 18:50:26 sars sems[20150]: [#b5884b70] [resampleOutput, AmAudio.cpp:447] 
DEBUG:  using internal resampler for output
Mar 18 18:50:26 sars kernel: [7720610.038594] sems[20163]: segfault at 10 ip 
080efe7f sp b5883a20 error 4 in sems[8048000+1ac000]

gdb shows this:

Program terminated with signal 11, Segmentation fault.
#0  AmMediaProcessorThread::processAudio (this=0x95493d0, ts=49074176)
    at AmMediaProcessor.cpp:292
292         if ((*it)->writeStreams(ts, buffer) < 0)
(gdb) where
#0  AmMediaProcessorThread::processAudio (this=0x95493d0, ts=49074176)
    at AmMediaProcessor.cpp:292
#1  0x080f0085 in AmMediaProcessorThread::run (this=0x95493d0)
    at AmMediaProcessor.cpp:256
#2  0x08161ea6 in AmThread::_start (_t=0x95493d0) at AmThread.cpp:66
#3  0xb771e955 in start_thread () from /lib/i686/cmov/libpthread.so.0
#4  0xb75771de in clone () from /lib/i686/cmov/libc.so.6

-- juha
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