Re: [Boost-bugs] [Boost C++ Libraries] #7666: Boost Thread SIGSEGV on join() when -D_GLIBCXX_DEBUG is used

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #7666: Boost Thread SIGSEGV on join() when -D_GLIBCXX_DEBUG is used
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-09-19 20:45:53

#7666: Boost Thread SIGSEGV on join() when -D_GLIBCXX_DEBUG is used
-------------------------------------+-------------------------------------
  Reporter:  Antonio Di Monaco       |      Owner:  viboes
  <tony@…>                           |     Status:  assigned
      Type:  Bugs                    |  Component:  thread
 Milestone:  Boost 1.55.0            |   Severity:  Problem
   Version:  Boost 1.52.0            |   Keywords:  thread SIGSEGV C++11
Resolution:                          |  -D_GLIBCXX_DEBUG
-------------------------------------+-------------------------------------

Comment (by Antonio Di Monaco <tony@…>):

 Well, I tried stepping, but it was not feasible for me.

 Anyway, I tried to "watch" notify variable, and something weird happens
 even before the thread is created and launched:


 {{{
 Breakpoint 1 at 0x40b6bc: file
 C:/x32-481-win32-sjlj-r2/include/boost/thread/win32/thread_data.hpp, line
 123.
 Starting program: C:\Users\Tony\Downloads\boost_1_54_0\test.exe
 [New Thread 3940.0xb20]

 Breakpoint 1, boost::detail::thread_data_base::thread_data_base (
     this=0x7748d8)
     at
 C:/x32-481-win32-sjlj-r2/include/boost/thread/win32/thread_data.hpp:123
 123                     , interruption_enabled(true)
 $1 = std::vector of length 0, capacity 0
 Watchpoint 2: notify
 $2 = std::vector of length 0, capacity 0
 Continuing.
 Watchpoint 2: notify

 Old value = std::vector of length 0, capacity 0
 New value = Cannot access memory at address 0x0
 #0  0x00407e4c in __gnu_debug::_Safe_sequence_base::_Safe_sequence_base (
     this=0x774900)
     at
 c:/x32-481-win32-sjlj-r2/lib/gcc/i686-w64-mingw32/4.8.1/include/c++/debug/safe_base.h:192
 #1  0x00407db3 in __gnu_debug::_Safe_sequence<std::__debug::map<void
 const*, boost::detail::tss_data_node, std::less<void const*>,
 std::allocator<std::pair<void const* const, boost::detail::tss_data_node>
 > > >::_Safe_sequence (
     this=0x774900)
     at
 c:/x32-481-win32-sjlj-r2/lib/gcc/i686-w64-mingw32/4.8.1/include/c++/debug/safe_sequence.h:111
 #2  0x00410754 in std::__debug::map<void const*,
 boost::detail::tss_data_node, std::less<void const*>,
 std::allocator<std::pair<void const* const, boost::detail::tss_data_node>
 > >::map (this=0x7748e8, __comp=..., __a=...)
     at
 c:/x32-481-win32-sjlj-r2/lib/gcc/i686-w64-mingw32/4.8.1/include/c++/debug/map.h:77
 #3  0x0040b71b in _fu4___ZTVN5boost6detail16thread_data_baseE ()
     at
 C:/x32-481-win32-sjlj-r2/include/boost/thread/win32/thread_data.hpp:123
 #4  0x0040b483 in boost::detail::thread_data<void (*)()>::thread_data(void
 (*&&)()) (this=0x7748d8,
     f_=<unknown type in C:\Users\Tony\Downloads\boost_1_54_0\test.exe, CU
 0x0, DIE 0x4f591>)
     at C:/x32-481-win32-sjlj-r2/include/boost/thread/detail/thread.hpp:98
 #5  0x0040bc75 in boost::detail::heap_new<boost::detail::thread_data<void
 (*)()>, void (*)()>(void (*&&)()) (
     a1=<unknown type in C:\Users\Tony\Downloads\boost_1_54_0\test.exe, CU
 0x0, DIE 0x4f591>)
     at
 C:/x32-481-win32-sjlj-r2/include/boost/thread/win32/thread_heap_alloc.hpp:100
 #6  0x0040c0b5 in boost::thread::make_thread_info (f=0x401637 <myFunc()>)
     at C:/x32-481-win32-sjlj-r2/include/boost/thread/detail/thread.hpp:220
 #7  0x0040c229 in boost::thread::thread<void (&)()> (this=0x28fe8c,
     f=@0x401637: {void (void)} 0x401637 <myFunc()>)
     at C:/x32-481-win32-sjlj-r2/include/boost/thread/detail/thread.hpp:265
 #8  0x00401720 in main () at test.cpp:10
 Continuing.
 Watchpoint 2: notify

 Old value = Cannot access memory at address 0x0
 Continuing.
 Watchpoint 2: notify

 Old value = Cannot access memory at address 0x0
 Continuing.

 Watchpoint 2 deleted because the program has left the block in
 which its expression is valid.

 Watchpoint 2 deleted because the program has left the block in
 which its expression is valid.

 Watchpoint 2 deleted because the program has left the block in
 which its expression is valid.
 0x779cdd84 in ?? ()
 Continuing.
 [New Thread 3940.0x700]

 Program received signal SIGSEGV, Segmentation fault.
 0x67e81537 in boost::detail::thread_data_base::~thread_data_base (
     this=0x7748d8, __in_chrg=<optimized out>)
     at libs\thread\src\win32\thread.cpp:45
 45                  i->second->unlock();
 Continuing.

 Program received signal SIGSEGV, Segmentation fault.
 0x67e81537 in boost::detail::thread_data_base::~thread_data_base (
     this=0x7748d8, __in_chrg=<optimized out>)
     at libs\thread\src\win32\thread.cpp:45
 45                  i->second->unlock();
 A debugging session is active.

         Inferior 1 [process 3940] will be killed.
 }}}

 Constructor thread_data_base::thread_data_base is called for the first
 time, and notify variable seems in a clean state. Then, it breaks again
 there, and now seems corrupted or something similar. Only after 3
 "continue" the thread is created, sleep, and join, and SIGSEGV triggers.

 Can you provide some methods where I can set up breakpoints, and print
 "notify" values each time that they're triggered?

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7666#comment:21>
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