Platform : qnx 6.6 
I have written a io-pkt pfil library which can be configured to block some incoming & outgoing connections based on its 
attribute (source / remote IP & port nos.) 

I am getting a io-pkt crash(stack blown up) in a specific scenario : 

Allow incoming ssh on port 22 (local port) , but block all outgoing connections . So in this case sshd on qnx is unable 
to respond back to the incoming request .In that case the ssh connection wont get established as expected but io-pkt 
crashes immediately when this packet is dropped . 
Jan 02 04:34:54    1    14     0 tcpip: blown stack handling 0x102.  See "stacks
ize" option.

What can be the probable cause of this issue ? If sshd is not running or no incoming ssh request is made , crash doesn't
 occur . If the response is allowed no crash occurs.

Any help would be useful .