This seems to be something specific for your environment. I tested with:
```
$var(fmt) = '{"srcip": "$si", "rcvip": "$Ri"}';
pv_evalx("$var(msg)", "$var(fmt)");
xlog("==== fmt: $var(fmt)\n");
xlog("==== msg: $var(msg)\n");
```
And I got:
```
2(4083) ERROR: <script>: ==== fmt: {"srcip": "$si", "rcvip": "$Ri"}
2(4083) ERROR: <script>: ==== msg: {"srcip": "127.0.0.1", "rcvip": "127.0.0.1"}
```
Can you test if pv_evalx() is successful? Did you set any pv-related global
parameters?
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