[Help-gnutls] Strange error in multi-threads

[Unknown]

Hello,
I have a problem with program. 

I have routines with gnutls functions, and work in program without any
problem.
The problem is that in multi-thread(apache) segfault.

Running apache in debug mode (one thread) the program do not segfault.

Have any problem gnutls with threads? Need special parameters?
Need special conditions?

Any suggestion are wellcome.