Memory leak issue in reset() function from boost::thread_specific_ptr

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
38/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
cpp
Domain
operating-systems

Research direction

Start with the minimal program in the issue and run the supplied Valgrind command to reproduce the report. Trace boost::thread_specific_ptr::reset() through the thread-specific storage functions named in the leak stack. Done means the reported allocation is no longer leaked while the reset() example continues to behave correctly.

Written by the indexing model from the issue text.

Description

Following memory leak issue is observed with reset() method from boost::thread_specific_ptr by using valgrind tool in Boost 1.75.

### Leak description:

==27891== 24 bytes in 1 blocks are still reachable in loss record 1 of 2
==27891==    at 0x4835DEF: operator new(unsigned long) (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==27891==    by 0x113064: boost::detail::make_external_thread_data() (in /home/{user}/boost_1_75_0/a.out)
==27891==    by 0x114084: boost::detail::add_new_tss_node(void const*, void (*)(void (*)(void*), void*), void (*)(void*), void*) (in /home/{user}/boost_1_75_0/a.out)
==27891==    by 0x1102F5: boost::thread_specific_ptr<int>::reset(int*) (in /home/{user}/boost_1_75_0/a.out)
==27891==    by 0x10DC07: main (in /home/{user}/boost_1_75_0/a.out)

Code Snippet:

#include <boost/thread.hpp>
#include <iostream>
int main()
{
	boost::thread_specific_ptr<int> conv_thread_ptr;
	if(!conv_thread_ptr.get())
	{
        	conv_thread_ptr.reset(new int);
	}
	return 0;
}

Command used for compilation:
g++ main.cpp -I./boost_1_75_0_install/include ./boost_1_75_0_install/lib/libboost_thread.a -lpthread

Command used for memory leak checking with valgrind:
valgrind --leak-check=full --show-leak-kinds=all --track-origins=yes --verbose --log-file=valgrind-out.txt ./a.out

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