cancellation with HAVE_FORCED_UNWIND

Good day,

I am constantly getting segmentation fault if I try to use
thread cancellation compiled with HAVE_FORCED_UNWIND. The 
fault happens in gcc/unwind-dw2-fde-glibc.c line 150:

if (hdr->version != 0)

Debugger shows that hdr is 0. My configuration is as follows:

linux-2.6.0-test5
binutils-031110
glibc-cvs-11-10-03
gcc-3.3.2

Am I missing something obvious here?

thanks,
-boris