Re: [Boost-bugs] [Boost C++ Libraries] #13562: Missing null pointer check in compensating_work_started

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #13562: Missing null pointer check in compensating_work_started
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2018-05-09 09:28:41

#13562: Missing null pointer check in compensating_work_started
-------------------------------+----------------------------
  Reporter:  michael.lindig@…  |      Owner:  chris_kohlhoff
      Type:  Bugs              |     Status:  new
 Milestone:  To Be Determined  |  Component:  asio
   Version:  Boost 1.66.0      |   Severity:  Problem
Resolution:                    |   Keywords:
-------------------------------+----------------------------

Comment (by Vladimir Shapranov <equidamoid@…>):

 Just found this ticket while googling for a crash I'm currently trying to
 fix:

 {{{
 (gdb) bt
 #0  0x00d1d4e8 in
 boost::asio::detail::scheduler::compensating_work_started (this=0x1c02f90)
 at include/boost/asio/detail/impl/scheduler.ipp:275
 #1  0x00d1d0bc in
 boost::asio::detail::epoll_reactor::perform_io_cleanup_on_block_exit::~perform_io_cleanup_on_block_exit
 (this=0x618feca4, __in_chrg=<optimized out>) at
 include/boost/asio/detail/impl/epoll_reactor.ipp:712
 #2  0x00d1d334 in
 boost::asio::detail::epoll_reactor::descriptor_state::perform_io
 (this=0x1c05ef0, events=1) at
 include/boost/asio/detail/impl/epoll_reactor.ipp:730
 #3  0x00d1d3b8 in
 boost::asio::detail::epoll_reactor::descriptor_state::do_complete
 (owner=0x1c02f90, base=0x1c05ef0, ec=..., bytes_transferred=1) at
 include/boost/asio/detail/impl/epoll_reactor.ipp:774
 #4  0x76c2e370 in boost::asio::detail::scheduler_operation::complete
 (bytes_transferred=1, ec=..., owner=0x1c02f90, this=<optimized out>) at
 include/boost/asio/detail/scheduler_operation.hpp:40
 #5  boost::asio::detail::scheduler::do_run_one (ec=..., this_thread=...,
 lock=..., this=0x1c02f90) at
 include/boost/asio/detail/impl/scheduler.ipp:401
 #6  boost::asio::detail::scheduler::run (ec=..., this=0x1c02f90) at
 include/boost/asio/detail/impl/scheduler.ipp:154
 #7  boost::asio::io_context::run (this=<optimized out>) at
 include/boost/asio/impl/io_context.ipp:62
 #
 }}}

 The relevant TLS entry is null:
 {{{
 (gdb) print
 boost::asio::detail::call_stack<boost::asio::detail::thread_context,
 boost::asio::detail::thread_info_base>::top_.tss_key_
 $1 = 8
 (gdb) print *((struct pthread*)pthread_self())->specific_at_32
 $2 = {0x618ff42c, 0x0 <repeats 31 times>}
 }}}

 Reproduces when an executable linked against multiple shared libraries
 that are linked against static boost.

-- 
Ticket URL: <https://svn.boost.org/trac10/ticket/13562#comment:1>
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