Paste: parallel-map backtrace

#0  0x00007ffff2e82445 in __GI_raise (sig=<optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007ffff2e85bab in __GI_abort () at abort.c:91
#2  0x0000000000450c48 in factor::abort () at vm/os-unix.cpp:555
#3  0x00000000004785d3 in factor::fatal_error (msg=0x498d46 "Cannot protect low guard page", tagged=140719508721664) at vm/errors.cpp:25
#4  0x000000000044fba8 in factor::segment::segment (this=0xe72370, size_=1048576, executable_p=false) at vm/os-unix.cpp:110
#5  0x000000000046f50b in factor::context::context (this=0xe72290, datastack_size=262144, retainstack_size=262144, callstack_size=1048576)
    at vm/contexts.cpp:14
#6  0x000000000046fa12 in factor::factor_vm::new_context (this=0x6c6410) at vm/contexts.cpp:131
#7  0x000000000046faf0 in factor::new_context (parent=0x6c6410) at vm/contexts.cpp:155
#8  0x00007fffdca379c1 in ?? ()
#9  0x00000000006c6410 in ?? ()
#10 0x00007fffdcd56c5c in ?? ()
#11 0x00007fffed734bdb in ?? ()
#12 0x00007fffdca43793 in ?? ()
#13 0x00007ffff7f04f00 in ?? ()
#14 0x00007fffdca969af in ?? ()
#15 0x00000000006c6410 in ?? ()
#16 0x00007fffdca79649 in ?? ()
#17 0x00007fffed734bdb in ?? ()
#18 0x00007fffdd97bfd6 in ?? ()
#19 0x00007ffff7f04f30 in ?? ()
#20 0x000000000048f6c2 in factor::primitive_clone (parent=0x683ac200007fffed) at vm/primitives.cpp:11
Backtrace stopped: previous frame inner to this frame (corrupt stack?)