Defining a large global vector of strings results in page fault

[razvand]

This is the program highlighting the issue. For 2726 items in the CXX_VALUES vector, it causes a page fault. For 2725 items (one less) there is no page fault. This is happening both on the kvm and on the linuxu platforms.

A stack trace of the issue points to:

(gdb) bt
#0  std::__1::ios_base::Init::Init (this=<optimized out>) at /home/razvan/projects/unicore/unikraft-my/apps/t/build/libcxx/origin/libcxx-7.0.0.src/src/iostream.cpp:85
#1  0x0000000000204fae in __static_initialization_and_destruction_0 (__priority=65535, __initialize_p=1) at /home/razvan/projects/unicore/unikraft-my/apps/t/build/libcxx/origin/libcxx-7
.0.0.src/src/iostream.cpp:80
#2  _GLOBAL__sub_I__ZNSt3__13cinE () at /home/razvan/projects/unicore/unikraft-my/apps/t/build/libcxx/origin/libcxx-7.0.0.src/src/iostream.cpp:124
#3  0x000000000010c0b2 in main_thread_func (arg=0x3fdff50) at /home/razvan/projects/unicore/unikraft-my/unikraft.git/lib/ukboot/boot.c:135
#4  0x0000000000105757 in asm_thread_starter () at /home/razvan/projects/unicore/unikraft-my/unikraft.git/plat/common/x86/thread_start.S:39
#5  0x0000000000000000 in ?? ()

The highlighted instruction (=>) is the one where the issue occurs.

(gdb) disass
Dump of assembler code for function std::__1::ios_base::Init::Init():
   0x0000000000141e10 <+0>:     push   %rbp
   0x0000000000141e11 <+1>:     mov    %rsp,%rbp
   0x0000000000141e14 <+4>:     push   %rbx
   0x0000000000141e15 <+5>:     sub    $0x18,%rsp
   0x0000000000141e19 <+9>:     callq  0x110ec0 <__getreent>
   0x0000000000141e1e <+14>:    mov    $0x29a3a0,%edi
=> 0x0000000000141e23 <+19>:    mov    0x8(%rax),%rbx
   0x0000000000141e27 <+23>:    callq  0x213640 <std::__1::basic_streambuf<char, std::__1::char_traits<char> >::basic_streambuf()>
   0x0000000000141e2c <+28>:    lea    -0x18(%rbp),%rdi

It seems to point to a C++ initialization issue in Unikraft, before the calling of the main() function.
It's possible to be related to memory alocation / initialization in the Unikraft startup sequence.