Experimental Physics and
Industrial Control System

** Description changed:

  The database below fails with
  ```
  pvaLink void {anonymous}::pvaOpenLink(DBLINK*) fails MTEST-JSON:inp_json_calc: DBLINK* corrupt
  ```
  
  system details:
  linux x86_64
  EPICS R7.0.7-DEV, as well as R7.0.7
  
  database
  ```
  record(ai, "MTEST-JSON:A1") {
-     field(VAL,  1)
-     field(PINI, 1)
+     field(VAL,  1)
+     field(PINI, 1)
  }
  
  record(ai, "MTEST-JSON:inp_json_calc") {
-     field(INP,
-         {
-             "calc": {
-                 "expr": "A|B|C",
-                 "args": [
-                     {
-                         "const": 0
-                     },
-                     0,
-                     {
-                         "pva": {
-                             "pv": "MTEST-JSON:A1",
-                             "field":"VAL",
-                         }
-                     }
-                 ]
-             }
-         }
-     )
+     field(INP,
+         {
+             "calc": {
+                 "expr": "A|B|C",
+                 "args": [
+                     {
+                         "const": 0
+                     },
+                     0,
+                     {
+                         "pva": {
+                             "pv": "MTEST-JSON:A1",
+                             "proc": "CP"
+                         }
+                     }
+                 ]
+             }
+         }
+     )
  }
  ```

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https://bugs.launchpad.net/bugs/2031563

Title:
  json input link with calc->expr->pva not working

Status in EPICS Base:
  New

Bug description:
  The database below fails with
  ```
  pvaLink void {anonymous}::pvaOpenLink(DBLINK*) fails MTEST-JSON:inp_json_calc: DBLINK* corrupt
  ```

  system details:
  linux x86_64
  EPICS R7.0.7-DEV, as well as R7.0.7

  database
  ```
  record(ai, "MTEST-JSON:A1") {
      field(VAL,  1)
      field(PINI, 1)
  }

  record(ai, "MTEST-JSON:inp_json_calc") {
      field(INP,
          {
              "calc": {
                  "expr": "A|B|C",
                  "args": [
                      {
                          "const": 0
                      },
                      0,
                      {
                          "pva": {
                              "pv": "MTEST-JSON:A1",
                              "proc": "CP"
                          }
                      }
                  ]
              }
          }
      )
  }
  ```

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References:

[Bug 2031563] [NEW] json input link with calc->expr->pva not working Niko Kivel via Core-talk

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