--- boost_thread.stderr.exp
+++ boost_thread.stderr.out
@@ -1,6 +1,52 @@
 
 Thread 1.
+Thread 2:
+Conflicting load by thread 2 at 0x........ size 4
+   at 0x........: boost::thread_detail::enter_once_region(boost::once_flag&) (in /usr/lib/libboost_thread.so.1.83.0)
+   by 0x........: ??? (in /usr/lib/libboost_thread.so.1.83.0)
+   by 0x........: ??? (in /usr/lib/libboost_thread.so.1.83.0)
+   by 0x........: vgDrd_thread_wrapper (drd_pthread_intercepts.c:?)
+   by 0x........: start_thread
+   by 0x........: clone (in /...libc...)
+Allocation context: BSS section of libboost_thread.so.1.83.0
+Other segment start (thread 1)
+   at 0x........: pthread_mutex_lock (drd_pthread_intercepts.c:?)
+   by 0x........: boost::thread_detail::commit_once_region(boost::once_flag&) (in /usr/lib/libboost_thread.so.1.83.0)
+   by 0x........: boost::detail::get_current_thread_data() (in /usr/lib/libboost_thread.so.1.83.0)
+   by 0x........: boost::detail::interruption_checker::interruption_checker(pthread_mutex_t*, pthread_cond_t*) (thread_data.hpp:207)
+   by 0x........: void boost::condition_variable_any::wait<boost::unique_lock<boost::mutex> >(boost::unique_lock<boost::mutex>&) (condition_variable.hpp:194)
+   by 0x........: main (boost_thread.cpp:?)
+Other segment end (thread 1)
+   at 0x........: pthread_mutex_unlock (drd_pthread_intercepts.c:?)
+   by 0x........: boost::thread_detail::commit_once_region(boost::once_flag&) (in /usr/lib/libboost_thread.so.1.83.0)
+   by 0x........: boost::detail::get_current_thread_data() (in /usr/lib/libboost_thread.so.1.83.0)
+   by 0x........: boost::detail::interruption_checker::interruption_checker(pthread_mutex_t*, pthread_cond_t*) (thread_data.hpp:207)
+   by 0x........: void boost::condition_variable_any::wait<boost::unique_lock<boost::mutex> >(boost::unique_lock<boost::mutex>&) (condition_variable.hpp:194)
+   by 0x........: main (boost_thread.cpp:?)
+
+Conflicting load by thread 2 at 0x........ size 4
+   at 0x........: ??? (in /usr/lib/libboost_thread.so.1.83.0)
+   by 0x........: ??? (in /usr/lib/libboost_thread.so.1.83.0)
+   by 0x........: vgDrd_thread_wrapper (drd_pthread_intercepts.c:?)
+   by 0x........: start_thread
+   by 0x........: clone (in /...libc...)
+Allocation context: BSS section of libboost_thread.so.1.83.0
+Other segment start (thread 1)
+   at 0x........: pthread_mutex_unlock (drd_pthread_intercepts.c:?)
+   by 0x........: boost::thread_detail::enter_once_region(boost::once_flag&) (in /usr/lib/libboost_thread.so.1.83.0)
+   by 0x........: boost::detail::get_current_thread_data() (in /usr/lib/libboost_thread.so.1.83.0)
+   by 0x........: boost::detail::interruption_checker::interruption_checker(pthread_mutex_t*, pthread_cond_t*) (thread_data.hpp:207)
+   by 0x........: void boost::condition_variable_any::wait<boost::unique_lock<boost::mutex> >(boost::unique_lock<boost::mutex>&) (condition_variable.hpp:194)
+   by 0x........: main (boost_thread.cpp:?)
+Other segment end (thread 1)
+   at 0x........: pthread_mutex_lock (drd_pthread_intercepts.c:?)
+   by 0x........: boost::thread_detail::commit_once_region(boost::once_flag&) (in /usr/lib/libboost_thread.so.1.83.0)
+   by 0x........: boost::detail::get_current_thread_data() (in /usr/lib/libboost_thread.so.1.83.0)
+   by 0x........: boost::detail::interruption_checker::interruption_checker(pthread_mutex_t*, pthread_cond_t*) (thread_data.hpp:207)
+   by 0x........: void boost::condition_variable_any::wait<boost::unique_lock<boost::mutex> >(boost::unique_lock<boost::mutex>&) (condition_variable.hpp:194)
+   by 0x........: main (boost_thread.cpp:?)
+
 Thread 2.
 Finished.
 
-ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
+ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)