corrupted stack (backtrace) from sigaction handler

[trafdev]

Hello!

Could you launch attached code on your machine and respond with an 
output (and FreeBSD version).

Here is mine (FreeBSD 10.2) output:

	stack dump [0]  0x40d4e5 <_Z9stackdumpPKc+0x85> at 
/ara/devel/sandbox/new/cpp/Release/cpp
	stack dump [1]  0x40dafd <_Z13signalHandleriP9__siginfoPv+0x3d> at 
/ara/devel/sandbox/new/cpp/Release/cpp
	stack dump [2]  0x801f30997 <pthread_sigmask+0x497> at /lib/libthr.so.3
	stack dump [3]  0x801f301a8 <pthread_getspecific+0xdd8> at /lib/libthr.so.3

All info before signalHandler (foo/foo2 functions) is missed.