On RHEL7, perf stat is reporting incorrect output while measuring performance counter

Issue

• While measuring L1-dcache-loads performance counter with perf, the results are varying depending on other requested events.
• In the example below, stalled-cycles* events are requested in addition to L1-dcache*, and L1-dcache-loads is reported as 0 (which is less than L1-dcache-load-misses).

$ perf stat -e cycles,stalled-cycles-frontend,stalled-cycles-backend,cache-misses,cache-references,L1-dcache-load-misses,L1-dcache-loads ls -lR >/dev/null

 Performance counter stats for 'ls -lR':

    26,024,782,410      cycles                   
    13,361,154,466      stalled-cycles-frontend   #   51.34% frontend cycles idle   
     8,953,266,724      stalled-cycles-backend    #   34.40% backend  cycles idle   
        13,016,947      cache-misses              #    6.923 % of all cache refs    
       188,033,023      cache-references                                            
       422,911,848      L1-dcache-load-misses     #    0.00% of all L1-dcache hits  
                 0      L1-dcache-loads                                             

      11.643342128 seconds time elapsed

• In the below second example, without requesting stalled-cycles* events, the L1-dcache stats seem correct.

$ perf stat -e cycles,cache-misses,cache-references,L1-dcache-load-misses,L1-dcache-loads ls -lR >/dev/null

 Performance counter stats for 'ls -lR':

    16,372,131,296      cycles                   
         4,779,769      cache-misses              #   10.904 % of all cache refs    
        43,833,706      cache-references                                            
       226,938,713      L1-dcache-load-misses     #    3.50% of all L1-dcache hits  
     6,477,653,079      L1-dcache-loads                                             

       4.540951230 seconds time elapsed

• The issue here is that the perf loses existing counters when more events are requested (as seen in first example).
• If we remove some events (second example), then perf reports sensible values for the events that were previously wrong.