[Asterisk-Users] AGI two calls - one hangs up - othere gets "interrupted system call"

[Jerry Geis]

I am using the outgoing spool directory and place two files there to 
call two extensions.
I have FC3 and T100P card.

example call files:
Channel: ZAP/g1/207
Context: testing-multicall
Extension: 55
Priority: 1
RetryTime: 2
WaitTime: 20
MaxRetries: 0

Channel: ZAP/g1/216
Context: testing-multicall
Extension: 55
Priority: 1
RetryTime: 2
WaitTime: 20
MaxRetries: 0

extensions.conf
[testing-multicall]
exten => 55,1,agi(smvoice,-playback,vm-youhave)
exten => 55,2,agi(smvoice,-playback,vm-youhave)
exten => 55,3,agi(smvoice,-playback,vm-youhave)
exten => 55,4,agi(smvoice,-playback,vm-youhave)
exten => 55,5,agi(smvoice,-playback,demo-congrats)
exten => 55,6,hangup

The calls are placed and playback(demo-congrats) most of the time works.

I answer the first call, hear it play, answer the second call, and 
hangup after a second.

Sometimes the first call receives a hangup message and the console then has:
file.c:1058 ast-waitstream_full wait failed (Interrupted System Call)

Any ideas on this? Thanks,

Jerry