In my project I run x3-based parsers in parallel, using openmp.

I've just moved from boost 1.64 to 1.68, and the parsers now cause segfault (heap corruption) - quite consistently, every time I run the program. OTOH, with 1.64 it never crashed.

Before I begin to debug it in depth, I'd like to know if there's some known issue with Spirit's thread-safety in Boost 1.68. 

Did anyone encounter thread-safety issie with the recent Spirit versions?

Thanks.