diff --git a/packages/SwingSet/src/kernel/kernel.js b/packages/SwingSet/src/kernel/kernel.js
index 6ea24bb3d49..13a41731d4c 100644
--- a/packages/SwingSet/src/kernel/kernel.js
+++ b/packages/SwingSet/src/kernel/kernel.js
@@ -146,8 +146,14 @@ export default function buildKernel(
   }
   harden(testLog);
 
-  function makeVatConsole(vatID) {
-    const origConsole = makeConsole(`${debugPrefix}SwingSet:${vatID}`);
+  function makeVatConsole(kind, vatID) {
+    const origConsole = makeConsole(`${debugPrefix}SwingSet:${kind}:${vatID}`);
+    if (kind === 'ls') {
+      // LiveSlots is not recorded to kernelSlog.
+      // The slog captures 1: what a vat is told to do, and
+      // 2: what a vat says about its activities
+      return origConsole;
+    }
     return kernelSlog.vatConsole(vatID, origConsole);
   }
 
diff --git a/packages/SwingSet/src/kernel/liveSlots.js b/packages/SwingSet/src/kernel/liveSlots.js
index c2add6ca14f..b42698ec667 100644
--- a/packages/SwingSet/src/kernel/liveSlots.js
+++ b/packages/SwingSet/src/kernel/liveSlots.js
@@ -28,6 +28,7 @@ const DEFAULT_VIRTUAL_OBJECT_CACHE_SIZE = 3; // XXX ridiculously small value to
  * @param {number} cacheSize  Maximum number of entries in the virtual object state cache
  * @param {*} vatPowers
  * @param {*} vatParameters
+ * @param {Console} console
  * @returns {*} { vatGlobals, dispatch, setBuildRootObject }
  *
  * setBuildRootObject should be called, once, with a function that will
@@ -36,7 +37,14 @@ const DEFAULT_VIRTUAL_OBJECT_CACHE_SIZE = 3; // XXX ridiculously small value to
  *
  *     buildRootObject(vatPowers, vatParameters)
  */
-function build(syscall, forVatID, cacheSize, vatPowers, vatParameters) {
+function build(
+  syscall,
+  forVatID,
+  cacheSize,
+  vatPowers,
+  vatParameters,
+  console,
+) {
   const enableLSDebug = false;
   function lsdebug(...args) {
     if (enableLSDebug) {
@@ -214,6 +222,12 @@ function build(syscall, forVatID, cacheSize, vatPowers, vatParameters) {
   // eslint-disable-next-line no-use-before-define
   const m = makeMarshal(convertValToSlot, convertSlotToVal, {
     marshalName: `liveSlots:${forVatID}`,
+    marshalSaveError: err =>
+      // By sending this to `console.log`, under cosmic-swingset this is
+      // controlled by the `console` option given to makeLiveSlots.  For Agoric,
+      // this output is enabled by `agoric start -v` and not enabled without the
+      // `-v` flag.
+      console.log('Logging sent error stack', err),
   });
 
   const {
@@ -635,6 +649,7 @@ function build(syscall, forVatID, cacheSize, vatPowers, vatParameters) {
  * @param {*} vatParameters
  * @param {number} cacheSize  Upper bound on virtual object cache size
  * @param {*} _gcTools
+ * @param {Console} [liveSlotsConsole]
  * @returns {*} { vatGlobals, dispatch, setBuildRootObject }
  *
  * setBuildRootObject should be called, once, with a function that will
@@ -666,12 +681,20 @@ export function makeLiveSlots(
   vatParameters = harden({}),
   cacheSize = DEFAULT_VIRTUAL_OBJECT_CACHE_SIZE,
   _gcTools,
+  liveSlotsConsole = console,
 ) {
   const allVatPowers = {
     ...vatPowers,
     makeMarshal,
   };
-  const r = build(syscall, forVatID, cacheSize, allVatPowers, vatParameters);
+  const r = build(
+    syscall,
+    forVatID,
+    cacheSize,
+    allVatPowers,
+    vatParameters,
+    liveSlotsConsole,
+  );
   const { vatGlobals, dispatch, setBuildRootObject } = r; // omit 'm'
   return harden({ vatGlobals, dispatch, setBuildRootObject });
 }
diff --git a/packages/SwingSet/src/kernel/loadVat.js b/packages/SwingSet/src/kernel/loadVat.js
index 73d6a7781b0..4260c57c8fc 100644
--- a/packages/SwingSet/src/kernel/loadVat.js
+++ b/packages/SwingSet/src/kernel/loadVat.js
@@ -209,7 +209,8 @@ export function makeVatLoader(stuff) {
         enablePipelining,
         enableInternalMetering: !isDynamic,
         notifyTermination,
-        vatConsole: makeVatConsole(vatID),
+        vatConsole: makeVatConsole('vat', vatID),
+        liveSlotsConsole: makeVatConsole('ls', vatID),
         vatParameters,
         virtualObjectCacheSize,
       };
diff --git a/packages/SwingSet/src/kernel/vatManager/factory.js b/packages/SwingSet/src/kernel/vatManager/factory.js
index bf6dff91fd8..048eb21e22e 100644
--- a/packages/SwingSet/src/kernel/vatManager/factory.js
+++ b/packages/SwingSet/src/kernel/vatManager/factory.js
@@ -59,6 +59,7 @@ export function makeVatManagerFactory({
       'metered',
       'enableSetup',
       'enableInternalMetering',
+      'liveSlotsConsole',
       'notifyTermination',
       'virtualObjectCacheSize',
       'vatParameters',
diff --git a/packages/SwingSet/src/kernel/vatManager/manager-local.js b/packages/SwingSet/src/kernel/vatManager/manager-local.js
index b3f9455a197..ab855419ede 100644
--- a/packages/SwingSet/src/kernel/vatManager/manager-local.js
+++ b/packages/SwingSet/src/kernel/vatManager/manager-local.js
@@ -88,6 +88,7 @@ export function makeLocalVatManagerFactory(tools) {
       enableInternalMetering = false,
       vatParameters = {},
       vatConsole,
+      liveSlotsConsole,
       virtualObjectCacheSize,
     } = managerOptions;
     assert(vatConsole, 'vats need managerOptions.vatConsole');
@@ -110,6 +111,7 @@ export function makeLocalVatManagerFactory(tools) {
       vatParameters,
       virtualObjectCacheSize,
       gcTools,
+      liveSlotsConsole,
     );
 
     let meterRecord = null;