System hangs with a lot of blocked tasks waiting on semaphore in memory subsystem due to memory pressure.

Issue

• System hangs with a lot of blocked tasks waiting on semaphore in memory subsystem due to memory pressure.

crash> log | grep blocked
INFO: task khugepaged:102 blocked for more than 120 seconds.
INFO: task cmahostd:17971 blocked for more than 120 seconds.
INFO: task opcmona:17184 blocked for more than 120 seconds.
INFO: task opcmona:17190 blocked for more than 120 seconds.
INFO: task opcmona:17191 blocked for more than 120 seconds.
INFO: task opcmona:17193 blocked for more than 120 seconds.
INFO: task opcmona:17194 blocked for more than 120 seconds.
INFO: task opcmona:17195 blocked for more than 120 seconds.
INFO: task opcmona:17198 blocked for more than 120 seconds.
INFO: task esb_vri_gate:63570 blocked for more than 120 seconds.

crash> kmem -i
                 PAGES        TOTAL      PERCENTAGE
    TOTAL MEM  16320407      62.3 GB         ----
         FREE  10877248      41.5 GB   66% of TOTAL MEM
         USED  5443159      20.8 GB   33% of TOTAL MEM
       SHARED    23992      93.7 MB    0% of TOTAL MEM
      BUFFERS    11418      44.6 MB    0% of TOTAL MEM
       CACHED  4250750      16.2 GB   26% of TOTAL MEM
         SLAB   177995     695.3 MB    1% of TOTAL MEM

   TOTAL SWAP   524286         2 GB         ----
    SWAP USED    96220     375.9 MB   18% of TOTAL SWAP
    SWAP FREE   428066       1.6 GB   81% of TOTAL SWAP

 COMMIT LIMIT  8684489      33.1 GB         ----
    COMMITTED  1957006       7.5 GB   22% of TOTAL LIMIT