CONTAP-49069: The "network route show" command displays "Loop detected in next() for table vifmgr_vs_routes"

Issue

• Routes are missing for the SVM svm1
  ::> net route show
  (network route show)
  Vserver Destination Gateway Metric
  ------------------- --------------- --------------- ------
  Cluster
  0.0.0.0/0 10.x.219.1 20
  svm2
  0.0.0.0/0 10.y.206.1 51
  svm3
  0.0.0.0/0 10.x.219.1 20
  svm4
  0.0.0.0/0 10.x.219.1 20
  4 entries were displayed.
  

• Unable to add or delete routes
  Cluster::> network route create -vserver svm1 -destination 0.0.0.0/0 -gateway 10.x.217.1 -metric 20
  Error: command failed: Duplicate route exists.
  
  Cluster::> network route create -vserver svm1 -destination 0.0.0.0/0 -gateway 10.x.219.1 -metric 30
  Error: command failed: Duplicate route exists.
  
  ::> network route show -vserver svm1 -destination * -gateway 10.x.219.1
  Vserver Destination Gateway Metric
  ------------------- --------------- --------------- ------
  svm1 0.0.0.0/0 10.0.219.1 20
  
  ::> network routeshow -vserver svm1 -destination * -gateway 10.x.217.1
  Error: show failed: Loop detected in next() for table vifmgr_vs_routes. Next on "4 0.0.0.0/0 10.x.217.1" returned "4 0.0.0.0/24 10.x.217.1".
  
  Cluster::*> network route delete -vserver svm1 -destination 0.0.0.0/0 -gateway 10.x.217.1
  Error: command failed: Internal error
  

• MGWD log:
  Tue Apr 28 2020 15:34:33 +07:00 [kern_vifmgr:info:5806] Error: Loop detected in next() for table vifmgr_vs_routes. Next on "4 0.0.0.0/0 10.0.217.1" returned "4 0.0.0.0/24 10.0.217.1".
  Tue Apr 28 2020 15:34:36 +07:00 [kern_vifmgr:info:5806] E [src/rdb/sql_local_stmt.cc 371 (0x81084a200)]: error: SQL error 11 (database disk image is malformed)