Hi,

I am using boost 1.65.1 interprocess lib, and tried to construct a string that is safe to store in a managed_shared_memory. 

Types  are defined as below: 

 using namespace boost::interprocess;  

 using ShmSegment_t = boost::interprocess::managed_shared_memory;                                                                                                                                       

 using SegmentMgr_t = boost::interprocess::managed_shared_memory::segment_manager;  

                                                                                           

 template <typename T>                                                                                                                                                                                        

 using Allocator_t = boost::interprocess::allocator<T, SegmentMgr_t>;   

 using String_t = boost::interprocess::basic_string<char, std::char_traits<char>, Allocator_t<char>>;   

Code in problem is as below:

using namespace boost::interprocess;  

ShmSegment_t segment(open_or_create, "Test",  1L << 31); 

const std::string stdStr("std_str");

String_t ipcStr( stdStr.c_str(), segment.get_segment_manager());  // oops, crashed! 

Crash backtrace is as below:

#0  0x00007ffff7ab735c in boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long, unsigned long, 0ul>, 0ul>::get_size (this=0x441f0ff40024)            at /usr/include/boost/interprocess/mem_algo/rbtree_best_fit.hpp:593

 #1  0x00007ffff7ab157a in boost::interprocess::segment_manager_base<boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long, unsigned long, 0ul>, 0u

l> >::get_size (this=0x441f0ff40024) at /usr/include/boost/interprocess/segment_manager.hpp:113

#2  0x00007ffff7ab002d in boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long, unsigned long, 0ul>, 0ul>, boost::interprocess::iset_index> >::max_size (this=0x7fffeeffbe80) at /usr/include/boost/interprocess/allocators/allocator.hpp:164

#3  0x00007ffff7aaf34d in boost::container::allocator_traits<boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_fa

mily, boost::interprocess::offset_ptr<void, long, unsigned long, 0ul>, 0ul>, boost::interprocess::iset_index> > >::priv_max_size (a=...) at /usr/include/boost/container/allocator_traits.hpp:397

#4  boost::container::allocator_traits<boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interproc

ess::offset_ptr<void, long, unsigned long, 0ul>, 0ul>, boost::interprocess::iset_index> > >::max_size (a=...) at /usr/include/boost/container/allocator_traits.hpp:331

#5  boost::container::container_detail::basic_string_base<boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_famil

y, boost::interprocess::offset_ptr<void, long, unsigned long, 0ul>, 0ul>, boost::interprocess::iset_index> > >::max_size (this=0x7fffeeffbe80) at /usr/include/boost/container/string.hpp:354

#6  0x00007ffff7aae68a in boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boo

st::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long, unsigned long, 0ul>, 0ul>, boost::interprocess::iset_index> > >::max_size (this=0x7fffeeffbe80)         

    at /usr/include/boost/container/string.hpp:1080

#7  0x00007ffff7aadb7a in boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boo

st::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long, unsigned long, 0ul>, 0ul>, boost::interprocess::iset_index> > >::priv_reserve (this=0x7fffeeffbe80, res_arg=21,

    null_terminate=true) at /usr/include/boost/container/string.hpp:2777                                                                                                      

#8  0x00007ffff7aad62a in boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boo

st::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long, unsigned long, 0ul>, 0ul>, boost::interprocess::iset_index> > >::reserve (this=0x7fffeeffbe80, res_arg=21)

    at /usr/include/boost/container/string.hpp:1141                                

#9  0x00007ffff7aacbdf in boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boo

st::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long, unsigned long, 0ul>, 0ul>, boost::interprocess::iset_index> > >::assign (this=0x7fffeeffbe80,

    first=0x7fff5c000d60 "std_str", last=0x7fff5c000d75 "") at /usr/include/boost/container/string.hpp:1494

#10 0x00007ffff7aac719 in boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boo

st::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long, unsigned long, 0ul>, 0ul>, boost::interprocess::iset_index> > >::basic_string (this=0x7fffeeffbe80,

    s=0x7fff5c000d60 "std_str", a=...) at /usr/include/boost/container/string.hpp:741

I tried "p m_header" within GDB at /usr/include/boost/interprocess/mem_algo/rbtree_best_fit.hpp:593, and GDB told me the memory is not accessable.   

What's worse is that the issue seems not happening in very code path, that's it sometimes works and sometimes fails. 

Any insight is appreciated. Thanks. 

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