Description of problem:
When running createrepo_c on a fully updated rawhide system I am seeing it segfault:

[root@composer-rawhide ~]# createrepo_c /tmp/bcl-repo/               
Directory walk started                                                                                                 
Directory walk done - 0 packages                           
Temporary output repo path: /tmp/bcl-repo/.repodata/                                                                                                                                                                                           
Preparing sqlite DBs                                                                                                   
Pool started (with 5 workers)                                                                                          
Pool finished                                                                                                          
GLib: Critical: g_async_queue_lock: assertion 'queue' failed                                                                                                                                                                                   
GLib: Critical: g_async_queue_push_unlocked: assertion 'queue' failed          
GLib: Critical: _g_async_queue_get_mutex: assertion 'queue' failed           
Segmentation fault (core dumped)

Version-Release number of selected component (if applicable):
createrepo_c-0.15.5-2.fc32.x86_64
createrepo_c-libs-0.15.5-2.fc32.x86_64
glib2-2.63.4-1.fc32.x86_6

How reproducible:
Always. This also happens with 0.15.5-1

Here's the coredump:

           PID: 822 (createrepo_c)                                                                                     
           UID: 0 (root)                                                                                               
           GID: 0 (root)                                                                                               
        Signal: 11 (SEGV)                                  
     Timestamp: Wed 2020-01-29 13:49:32 EST (3min 6s ago)                                                                                                                                                                                      
  Command Line: createrepo_c /tmp/bcl-repo/                                                                            
    Executable: /usr/bin/createrepo_c                                                                                  
 Control Group: /user.slice/user-0.slice/session-1.scope                                                               
          Unit: session-1.scope                                                                                                                                                                                                                
         Slice: user-0.slice                                                                                           
       Session: 1                                                                                                      
     Owner UID: 0 (root)                                                                                               
       Boot ID: d6d5c66e470a446b904aa6ec9e89f8cf                                                                       
    Machine ID: 7941c7ab10d247719555f1d42136f2c3                                                                       
      Hostname: composer-rawhide                           
       Storage: /var/lib/systemd/coredump/core.createrepo_c.0.d6d5c66e470a446b904aa6ec9e89f8cf.822.1580323772000000000000.lz4                                                                                                                  
       Message: Process 822 (createrepo_c) of user 0 dumped core.                                                      
                                                           
                Stack trace of thread 822:                                                                             
                #0  0x00007f442e082016 g_mutex_unlock (libglib-2.0.so.0 + 0x9f016)                                     
                #1  0x00007f442e08211a g_cond_wait (libglib-2.0.so.0 + 0x9f11a)                                        
                #2  0x00007f442e05f2df g_thread_pool_start_thread.constprop.0 (libglib-2.0.so.0 + 0x7c2df)             
                #3  0x00007f442e05f653 g_thread_pool_push (libglib-2.0.so.0 + 0x7c653)                                 
                #4  0x0000562de945773f main (createrepo_c + 0x873f)                                                    
                #5  0x00007f442de25042 __libc_start_main (libc.so.6 + 0x27042)                                         
                #6  0x0000562de945911e _start (createrepo_c + 0xa11e)                                                  
                                                                                                                       
                Stack trace of thread 827:                 
                #0  0x00007f442defa2dd syscall (libc.so.6 + 0xfc2dd)                                                   
                #1  0x00007f442e082256 g_cond_wait_until (libglib-2.0.so.0 + 0x9f256)                                  
                #2  0x00007f442e005541 g_async_queue_pop_intern_unlocked (libglib-2.0.so.0 + 0x22541)                  
                #3  0x00007f442e005b66 g_async_queue_timeout_pop (libglib-2.0.so.0 + 0x22b66)                          
                #4  0x00007f442e05efc9 g_thread_pool_thread_proxy (libglib-2.0.so.0 + 0x7bfc9)                         
                #5  0x00007f442e05e6a2 g_thread_proxy (libglib-2.0.so.0 + 0x7b6a2)                                     
                #6  0x00007f442d4fa432 start_thread (libpthread.so.0 + 0x9432)                                         
                #7  0x00007f442deff873 __clone (libc.so.6 + 0x101873)                                                  
                                                           
                Stack trace of thread 825:                                                                             
                #0  0x00007f442defa2dd syscall (libc.so.6 + 0xfc2dd)                                                   
                #1  0x00007f442e0815ac g_mutex_lock_slowpath (libglib-2.0.so.0 + 0x9e5ac)                              
                #2  0x00007f442e05eec9 g_thread_pool_thread_proxy (libglib-2.0.so.0 + 0x7bec9)                         
                #3  0x00007f442e05e6a2 g_thread_proxy (libglib-2.0.so.0 + 0x7b6a2)                                     
                #4  0x00007f442d4fa432 start_thread (libpthread.so.0 + 0x9432)                                         
                #5  0x00007f442deff873 __clone (libc.so.6 + 0x101873)