b457a01 Auto-sync with upstream branch release/2.28/master

Authored and Committed by codonell 5 years ago
    Auto-sync with upstream branch release/2.28/master
    
    Upstream commit: 4d7af7815af5217db6e8fde6032ddf4f6b2a4420
    
    - rdlock stalls indefinitely on an unlocked pthread rwlock (swbz#23861)
    
        
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