I'm not sure what you did that it crashes. Can you tell me on which line of code it happens (gdb -> stacktrace).
This is what I got from gdb so far: Program received signal SIGSEGV, Segmentation fault. 0x00000000006033f0 in get_fcontext () (gdb) bt #0 0x00000000006033f0 in get_fcontext () #1 0x00000000004018cd in context () at ../../boost_1_46_0/boost/context/context.hpp:68 #2 main () at link.cpp:24 (gdb) frame 0 #0 0x00000000006033f0 in get_fcontext () (gdb) disassemble Dump of assembler code for function get_fcontext: => 0x00000000006033f0 <+0>: mov %rbx,(%rdi) 0x00000000006033f3 <+3>: mov %r12,0x8(%rdi) 0x00000000006033f7 <+7>: mov %r13,0x10(%rdi) 0x00000000006033fb <+11>: mov %r14,0x18(%rdi) 0x00000000006033ff <+15>: mov %r15,0x20(%rdi) 0x0000000000603403 <+19>: mov %rbp,0x28(%rdi) 0x0000000000603407 <+23>: stmxcsr 0x48(%rdi) 0x000000000060340b <+27>: fnstcw 0x4c(%rdi) 0x000000000060340e <+30>: lea 0x8(%rsp),%rcx 0x0000000000603413 <+35>: mov %rcx,0x30(%rdi) 0x0000000000603417 <+39>: mov (%rsp),%rcx 0x000000000060341b <+43>: mov %rcx,0x38(%rdi) 0x000000000060341f <+47>: xor %rax,%rax 0x0000000000603422 <+50>: retq End of assembler dump. (gdb) info registers rax 0x0 0 rbx 0x7fffffffe0b0 140737488347312 rcx 0x0 0 rdx 0x0 0 rsi 0x7fffffffe1e0 140737488347616 rdi 0x7fffffffe0b0 140737488347312 rbp 0x7fffffffe140 0x7fffffffe140 rsp 0x7fffffffe098 0x7fffffffe098 r8 0x5 5 r9 0x0 0 r10 0x7fffffffde20 140737488346656 r11 0x7ffff7bc7378 140737349710712 r12 0x4015f0 4199920 r13 0x7fffffffe1d0 140737488347600 r14 0x0 0 r15 0x0 0 rip 0x6033f0 0x6033f0 <get_fcontext> eflags 0x10246 [ PF ZF IF RF ] cs 0x33 51 ss 0x2b 43 ds 0x0 0 es 0x0 0 fs 0x0 0 gs 0x0 0 (gdb) Artyom