Your aliases are pretty much identical to what we use, and we have no issues. I'd wager your issue is elsewhere in your program, however we are using Boost 1.58 I think. On Thu, Aug 2, 2018 at 10:31 AM, Zhiming Wang via Boost-users < boost-users@lists.boost.org> wrote:

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:

...

::max_size (this=0x7fffeeffbe80) at /usr/include/boost/ interprocess/allocators/allocator.hpp:164 #3 0x00007ffff7aaf34d in boost::container::allocator_

#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> 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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