asterisk users - Jun 2015 - 11.17.1 : ReceiveFax then signal 11 ??

dialplan

[FaxIncoming]

exten=s,1,NoOp(Incoming fax on 46-va)
 
same=n,Set(FAXFILE=/var/spool/asterisk/fax/${STRFTIME(${EPOCH},,%Y%m%d)}_${STRFTIME(${EPOCH},,%H%M)})
  same=n,Answer()
  same=n,ReceiveFAX(${FAXFILE}.tif,df)
  same=n,Hangup()
  exten=>h,1,NoOp(FAXSTATUS: ${FAXSTATUS} FAXERROR: ${FAXERROR} 
FAXPAGES: ${FAXPAGES} @ bitrate ${FAXBITRATE})
   same=n,System(scp ${FAXFILE}.tif 
asterisk at asterisk:/home/asterisk/ec2fax/ )
   same=n,System(ssh asterisk at asterisk 
"/home/asterisk/bin/email-ec2fax.sh  ${FAXFILE} ${CALLERID(name)} 
${CALLERID(num) " )

cli
.........
     -- Executing [s at FaxIncoming:3]
Answer("SIP/ec2faxcall17-00000000",
"") in new stack
     -- Executing [s at FaxIncoming:4] 
ReceiveFAX("SIP/ec2faxcall17-00000000", 
"/var/spool/asterisk/fax/20150605_2137.tif,df") in new stack
     -- Channel 'SIP/ec2faxcall17-00000000' receiving FAX 
'/var/spool/asterisk/fax/20150605_2137.tif'
ip-172-31-53-29*CLI>
Disconnected from Asterisk server
Asterisk cleanly ending (0).
Executing last minute cleanups

syslog

asterisk[11540]:     -- Executing [s at FaxIncoming:3] 
Answer("SIP/ec2faxcall17-00000000", "") in new stack
asterisk[11540]:     -- Executing [s at FaxIncoming:4] 
ReceiveFAX("SIP/ec2faxcall17-00000000", "/var/spool/a...ew stack
asterisk[11540]:     -- Channel 'SIP/ec2faxcall17-00000000' receiving 
FAX '/var/spool/asterisk/fax/20150605_2137.tif'
systemd[1]: asterisk.service: main process exited, code=killed, 
status=11/SEGV
asterisk[11587]: Unable to connect to remote asterisk (does 
/run/asterisk/asterisk.ctl exist?

Doesn't Signal 11 mean accessing prohibited ram ?

Does it matter this on an ec2 instance?

Thanks for any help.

sean